Re: [lustre-discuss] mdt mounting error

[Brian Andrus]

There is no specific requirement in Lustre to create multiple MGS; one 
MGS will often suffice for many file systems in a subnet.


You should have one MGT, it can be mounted on more than one MGS (but 
only one at a time). You need something in place that prevents it being 
mounted more than once. ZFS has that ability.


File:Metadata Server HA Cluster Simple lowres v1.png

Brian Andrus

On 11/1/2017 7:08 PM, Parag Khuraswar wrote:


I have two mds nodes. For HA purpose I mentioned –service node options

mkfs.lustre --servicenode=10.2.1.204@o2ib 
--servicenode=10.2.1.205@o2ib --mgs /dev/mapper/mpathc


Do I have to mention mgt in command ?

How many mgt’s we can have on one mds or mgs servers ?

Regards,

Parag

*From:*lustre-discuss [mailto:lustre-discuss-boun...@lists.lustre.org] 
*On Behalf Of *Brian Andrus

*Sent:* Thursday, November , 2017 7:30 AM
*To:* lustre-discuss@lists.lustre.org
*Subject:* Re: [lustre-discuss] mdt mounting error

I don't think you use the --servicenode option when formatting an 
mgs-only disk, or the --fsname option. Neither of those apply for an 
mgs-only with multiple filesystems.


My command for a zfs backed mgs was:

*/mkfs.lustre --mgs --backfstype=zfs MGT/mgt/*

Then I created 2 different sets of OSTs/MDTs with different fsnames, 
but the same mgsnode.


Brian Andrus

On 11/1/2017 6:50 PM, Parag Khuraswar wrote:

Hi Raj,

But I have two file system. And I think one mgt can be used for
two filesystems. Correct me if I am wrong.

Regards,

Parag

*From:*Raj [mailto:rajgau...@gmail.com]
*Sent:* Wednesday, November , 2017 4:57 PM
*To:* Parag Khuraswar; Lustre discussion
*Subject:* Re: [lustre-discuss] mdt mounting error

The following can contribute to this issue:

- Missing FS name in mgt creation (it must be <=9 character
long): --fsname=

mkfs.lustre --servicenode=10.2.1.204@o2ib

--servicenode=10.2.1.205@o2ib
 *--fsname=home* --mgs
/dev/mapper/mpathc

- verify if /mdt directory exists

On Wed, Nov 1, 2017 at 6:16 AM Raj > wrote:

What options in mkfs.lustre did you use to format with lustre?

On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar
> wrote:

Hi Raj,

Yes, /dev/mapper/mpatha available.

I could format and mount using ext4.

Regards,

Parag

*From:*Raj [mailto:rajgau...@gmail.com
]
*Sent:* Wednesday, November , 2017 4:39 PM
*To:* Parag Khuraswar; Lustre discussion
*Subject:* Re: [lustre-discuss] mdt mounting error

Parag,
Is the device /dev/mapper/mpatha available?
If not, the multipathd may not have started or the
multipath configuration may not be correct.

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar
>
wrote:

Hi,

I am getting below error while mounting mdt. Mgt is
mounted.

Please suggest

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed:
No such file or directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see
upgrade docs)

Regards,

Parag

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Re: [lustre-discuss] mdt mounting error

[Parag Khuraswar]

Hi Malcolm,

 

Yes mgt was mounted on the same node. Also /mdt exists on the node.

 

Regards,

Parag

 

 

From: Cowe, Malcolm J [mailto:malcolm.j.c...@intel.com] 
Sent: Thursday, November , 2017 2:16 AM
To: Parag Khuraswar; 'Raj'; 'Lustre discussion'
Subject: Re: [lustre-discuss] mdt mounting error

 

Is the MDT being mounted on the same node as the MGT? The ordering of the 
servicenode flags is (or was) significant for the first time the target is 
mounted, and if the services will run on different nodes, the servicenode 
parameters on the MDT should be swapped. And confirm that the /mdt directory 
exists on the server being used to mount the target.

 

Malcolm.

 

From: lustre-discuss  on behalf of 
Parag Khuraswar 
Date: Wednesday, 1 November 2017 at 10:21 pm
To: 'Raj' , Lustre discussion 

Subject: Re: [lustre-discuss] mdt mounting error

 

Hi,

 

For mgt –

mkfs.lustre --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mgs 
/dev/mapper/mpathc

 

For mdt 

mkfs.lustre --fsname=home --mgsnode=10.2.1.204@o2ib --mgsnode=10.2.1.205@o2ib 
--servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mdt --index=0 
/dev/mapper/mpatha

 

Regards,

Parag

 

 

From: Raj [mailto:rajgau...@gmail.com] 
Sent: Wednesday, November , 2017 4:46 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

What options in mkfs.lustre did you use to format with lustre?

On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar  wrote:

Hi Raj,

 

Yes, /dev/mapper/mpatha available. 

I could format and mount using ext4.

 

Regards,

Parag

 

 

From: Raj [mailto:rajgau...@gmail.com] 
Sent: Wednesday, November , 2017 4:39 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

Parag, 
Is the device /dev/mapper/mpatha available? 
If not, the multipathd may not have started or the multipath configuration may 
not be correct. 

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar  wrote:

Hi,

 

I am getting below error while mounting mdt. Mgt is mounted. 

 

Please suggest

 

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see upgrade docs)

 

Regards,

Parag

 

 

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Re: [lustre-discuss] mdt mounting error

[Brian Andrus]

I don't think you use the --servicenode option when formatting an 
mgs-only disk, or the --fsname option. Neither of those apply for an 
mgs-only with multiple filesystems.


My command for a zfs backed mgs was:

/*mkfs.lustre --mgs --backfstype=zfs MGT/mgt*/

Then I created 2 different sets of OSTs/MDTs with different fsnames, but 
the same mgsnode.


Brian Andrus


On 11/1/2017 6:50 PM, Parag Khuraswar wrote:


Hi Raj,

But I have two file system. And I think one mgt can be used for two 
filesystems. Correct me if I am wrong.


Regards,

Parag

*From:*Raj [mailto:rajgau...@gmail.com]
*Sent:* Wednesday, November , 2017 4:57 PM
*To:* Parag Khuraswar; Lustre discussion
*Subject:* Re: [lustre-discuss] mdt mounting error

The following can contribute to this issue:

- Missing FS name in mgt creation (it must be <=9 character 
long): --fsname=


mkfs.lustre --servicenode=10.2.1.204@o2ib 
 --servicenode=10.2.1.205@o2ib 
 *--fsname=home* --mgs 
/dev/mapper/mpathc


- verify if /mdt directory exists

On Wed, Nov 1, 2017 at 6:16 AM Raj > wrote:


What options in mkfs.lustre did you use to format with lustre?

On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar
> wrote:

Hi Raj,

Yes, /dev/mapper/mpatha available.

I could format and mount using ext4.

Regards,

Parag

*From:*Raj [mailto:rajgau...@gmail.com
]
*Sent:* Wednesday, November , 2017 4:39 PM
*To:* Parag Khuraswar; Lustre discussion
*Subject:* Re: [lustre-discuss] mdt mounting error

Parag,
Is the device /dev/mapper/mpatha available?
If not, the multipathd may not have started or the multipath
configuration may not be correct.

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar
> wrote:

Hi,

I am getting below error while mounting mdt. Mgt is mounted.

Please suggest

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No
such file or directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see upgrade
docs)

Regards,

Parag

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Re: [lustre-discuss] mdt mounting error

[Parag Khuraswar]

Hi Ben,

 

Lustre version is lustre-2.10.54_20_g66bb2d1.tar.gz (recently cloned from
github). Kernel is "3.10.0-514.el7.x86_64".

OS is RHEL 7.3.

 

Regards,

Parag

 

 

From: Ben Evans [mailto:bev...@cray.com] 
Sent: Wednesday, November , 2017 11:22 PM
To: parag_k; Mohr Jr, Richard Frank (Rick Mohr)
Cc: Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

What Lustre version and kernel version are you using?

 

I've seen issues with Lustre 2.7 and CentOS 7.4 where this happened.

 

-Ben Evans

 

From: lustre-discuss  on behalf of
parag_k 
Date: Wednesday, November 1, 2017 at 12:41 PM
To: "Mohr Jr, Richard Frank (Rick Mohr)" 
Cc: Lustre discussion 
Subject: Re: [lustre-discuss] mdt mounting error

 

Hi, 

 

 

Yes mgt was mounted when i tried mdt mounting. Mgt got mounted smoothly.

Firewall is disabled.

 

Regards, 

Parag

 

 Original message 

From: "Mohr Jr, Richard Frank (Rick Mohr)"  

Date: 01/11/2017 9:01 pm (GMT+05:30) 

To: Parag Khuraswar  

Cc: Raj , Lustre discussion
 

Subject: Re: [lustre-discuss] mdt mounting error 

 


> On Nov 1, 2017, at 7:18 AM, Parag Khuraswar 
wrote:
>  
> For mgt -
> mkfs.lustre --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib
--mgs /dev/mapper/mpathc
>  
> For mdt
> mkfs.lustre --fsname=home --mgsnode=10.2.1.204@o2ib
--mgsnode=10.2.1.205@o2ib --servicenode=10.2.1.204@o2ib
--servicenode=10.2.1.205@o2ib --mdt --index=0 /dev/mapper/mpatha
> 

Did you mount the mgt before trying to mount the mdt?  If so, did you get
any errors when trying to mount the mgt?

Another thing to check is firewall settings.  If there are firewall rules
blocking any traffic, that could cause a problem.

--
Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences
http://www.nics.tennessee.edu

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Re: [lustre-discuss] mdt mounting error

[Parag Khuraswar]

Hi Raj,

 

But I have two file system. And I think one mgt can be used for two 
filesystems. Correct me if I am wrong.

 

Regards,

Parag

 

 

From: Raj [mailto:rajgau...@gmail.com] 
Sent: Wednesday, November , 2017 4:57 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

The following can contribute to this issue:

- Missing FS name in mgt creation (it must be <=9 character long): --fsname=

mkfs.lustre --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib 
--fsname=home --mgs /dev/mapper/mpathc

 

- verify if /mdt directory exists

 

 

 

On Wed, Nov 1, 2017 at 6:16 AM Raj  wrote:

What options in mkfs.lustre did you use to format with lustre?

On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar  wrote:

Hi Raj,

 

Yes, /dev/mapper/mpatha available. 

I could format and mount using ext4.

 

Regards,

Parag

 

 

From: Raj [mailto:rajgau...@gmail.com] 
Sent: Wednesday, November , 2017 4:39 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

Parag, 
Is the device /dev/mapper/mpatha available? 
If not, the multipathd may not have started or the multipath configuration may 
not be correct. 

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar  wrote:

Hi,

 

I am getting below error while mounting mdt. Mgt is mounted. 

 

Please suggest

 

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see upgrade docs)

 

Regards,

Parag

 

 

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Re: [lustre-discuss] Lustre routing help needed

[Kevin M. Hildebrand]

So apparently the issue is indeed with the combination of using a Lustre
2.10.1 router with 2.8 servers and clients.  Downgrading the router to 2.9
seems to have solved the problem.
(I can't run 2.8 on the router, because I'm running MOFED 4.1 for the
Mellanox ConnectX-5, and I can't get 2.8 to build with that version...)

Thanks, everyone, for your assistance!
Kevin


On Mon, Oct 30, 2017 at 5:47 PM, Dilger, Andreas 
wrote:

> The 2.10 release added support for multi-rail LNet, which may potentially
> be causing problems here. I would suggest to install an older LNet version
> on your routers to match your client/server.
>
> You may need to build your own RPMs for your new kernel, but can use
> --disable-server for configure to simplify things.
>
> Cheers, Andreas
>
> On Oct 31, 2017, at 04:45, Kevin M. Hildebrand  wrote:
>
> Thanks, I completely missed that.  Indeed the ko2iblnd parameters were
> different between the servers and the router.  I've updated the parameters
> on the router to match those on the server, and things haven't gotten any
> better.  (The problem appears to be on the Ethernet side anyway, so you've
> probably helped me fix a problem I didn't know I had...)
> I don't see much discussion about configuring lnet parameters for Ethernet
> networks, I assume that's using ksocklnd.  On that side, it appears that
> all of the ksocklnd parameters match between the router and clients.
> Interesting that peer_timeout is 180, which is almost exactly when my
> client gets marked down on the router.
>
> Server (and now router) ko2iblnd parameters:
> peer_credits 8
> peer_credits_hiw 4
> credits 256
> concurrent_sends 8
> ntx 512
> map_on_demand 0
> fmr_pool_size 512
> fmr_flush_trigger 384
> fmr_cache 1
>
> Client and router ksocklnd:
> peer_timeout 180
> peer_credits 8
> keepalive 30
> sock_timeout 50
> credits 256
> rx_buffer_size 0
> tx_buffer_size 0
> keepalive_idle 30
> round_robin 1
> sock_timeout 50
>
> Thanks,
> Kevin
>
>
> On Mon, Oct 30, 2017 at 4:16 PM, Mohr Jr, Richard Frank (Rick Mohr) <
> rm...@utk.edu> wrote:
>
>>
>> > On Oct 30, 2017, at 8:47 AM, Kevin M. Hildebrand  wrote:
>> >
>> > All of the hosts (client, server, router) have the following in
>> ko2iblnd.conf:
>> >
>> > alias ko2iblnd-opa ko2iblnd
>> > options ko2iblnd-opa peer_credits=128 peer_credits_hiw=64 credits=1024
>> concurrent_sends=256 ntx=2048 map_on_demand=32 fmr_pool_size=2048
>> fmr_flush_trigger=512 fmr_cache=1 conns_per_peer=4
>> >
>> > install ko2iblnd /usr/sbin/ko2iblnd-probe
>>
>> Those parameters will only get applied to omnipath interfaces (which you
>> don’t have), so everything you have should just be running with default
>> parameters.  Since your lnet routers have a different version of lustre
>> than your servers/clients, it might be possible that the default values for
>> the ko2iblnd parameters are different between the two versions.  You can
>> always check this by looking at the values in the files under
>> /sys/module/ko2iblnd/parameters.  It might be worthwhile to compare
>> those values on the lnet routers to the values on the servers to see if
>> maybe there is a difference that could affect the behavior.
>>
>> --
>> Rick Mohr
>> Senior HPC System Administrator
>> National Institute for Computational Sciences
>> http://www.nics.tennessee.edu
>>
>>
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>
>
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Re: [lustre-discuss] mdt mounting error

[Cowe, Malcolm J]

Is the MDT being mounted on the same node as the MGT? The ordering of the 
servicenode flags is (or was) significant for the first time the target is 
mounted, and if the services will run on different nodes, the servicenode 
parameters on the MDT should be swapped. And confirm that the /mdt directory 
exists on the server being used to mount the target.

Malcolm.

From: lustre-discuss  on behalf of 
Parag Khuraswar 
Date: Wednesday, 1 November 2017 at 10:21 pm
To: 'Raj' , Lustre discussion 

Subject: Re: [lustre-discuss] mdt mounting error

Hi,

For mgt –
mkfs.lustre --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mgs 
/dev/mapper/mpathc

For mdt
mkfs.lustre --fsname=home --mgsnode=10.2.1.204@o2ib --mgsnode=10.2.1.205@o2ib 
--servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mdt --index=0 
/dev/mapper/mpatha

Regards,
Parag


From: Raj [mailto:rajgau...@gmail.com]
Sent: Wednesday, November , 2017 4:46 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

What options in mkfs.lustre did you use to format with lustre?
On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar 
> wrote:
Hi Raj,

Yes, /dev/mapper/mpatha available.
I could format and mount using ext4.

Regards,
Parag


From: Raj [mailto:rajgau...@gmail.com]
Sent: Wednesday, November , 2017 4:39 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

Parag,
Is the device /dev/mapper/mpatha available?
If not, the multipathd may not have started or the multipath configuration may 
not be correct.
On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar 
> wrote:
Hi,

I am getting below error while mounting mdt. Mgt is mounted.

Please suggest

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt
mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or directory
Is the MGS specification correct?
Is the filesystem name correct?
If upgrading, is the copied client log valid? (see upgrade docs)

Regards,
Parag


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Re: [lustre-discuss] mdt mounting error

[Ben Evans]

What Lustre version and kernel version are you using?

I've seen issues with Lustre 2.7 and CentOS 7.4 where this happened.

-Ben Evans

From: lustre-discuss 
>
 on behalf of parag_k >
Date: Wednesday, November 1, 2017 at 12:41 PM
To: "Mohr Jr, Richard Frank (Rick Mohr)" >
Cc: Lustre discussion 
>
Subject: Re: [lustre-discuss] mdt mounting error

Hi,


Yes mgt was mounted when i tried mdt mounting. Mgt got mounted smoothly.
Firewall is disabled.

Regards,
Parag

 Original message 
From: "Mohr Jr, Richard Frank (Rick Mohr)" >
Date: 01/11/2017 9:01 pm (GMT+05:30)
To: Parag Khuraswar >
Cc: Raj >, Lustre discussion 
>
Subject: Re: [lustre-discuss] mdt mounting error


> On Nov 1, 2017, at 7:18 AM, Parag Khuraswar 
> > wrote:
>
> For mgt –
> mkfs.lustre --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mgs 
> /dev/mapper/mpathc
>
> For mdt
> mkfs.lustre --fsname=home --mgsnode=10.2.1.204@o2ib --mgsnode=10.2.1.205@o2ib 
> --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mdt --index=0 
> /dev/mapper/mpatha
>

Did you mount the mgt before trying to mount the mdt?  If so, did you get any 
errors when trying to mount the mgt?

Another thing to check is firewall settings.  If there are firewall rules 
blocking any traffic, that could cause a problem.

--
Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences
http://www.nics.tennessee.edu

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Re: [lustre-discuss] mdt mounting error

[Mohr Jr, Richard Frank (Rick Mohr)]

> On Nov 1, 2017, at 7:18 AM, Parag Khuraswar  wrote:
>  
> For mgt –
> mkfs.lustre --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mgs 
> /dev/mapper/mpathc
>  
> For mdt
> mkfs.lustre --fsname=home --mgsnode=10.2.1.204@o2ib --mgsnode=10.2.1.205@o2ib 
> --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mdt --index=0 
> /dev/mapper/mpatha
> 

Did you mount the mgt before trying to mount the mdt?  If so, did you get any 
errors when trying to mount the mgt?

Another thing to check is firewall settings.  If there are firewall rules 
blocking any traffic, that could cause a problem.

--
Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences
http://www.nics.tennessee.edu

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Re: [lustre-discuss] mdt mounting error

[parag_k]

Okay...will check thatbut lustre & lnet services are running.


Regards,Parag
 Original message From: Ben Evans  Date: 
01/11/2017  6:18 pm  (GMT+05:30) To: Raj , Parag Khuraswar 
 Cc: Lustre discussion 
 Subject: Re: [lustre-discuss] mdt mounting 
error 

On the node in question Try: lsmod | grep lustre



followed by: modprobe lustre



I'm betting the modules aren't loaded for some reason, generally that reason is 
found in dmesg.





From: lustre-discuss  on behalf of Raj 


Date: Wednesday, November 1, 2017 at 7:48 AM

To: Parag Khuraswar 

Cc: Lustre discussion 

Subject: Re: [lustre-discuss] mdt mounting error








Parag, I have not tested two FS using a common MGT and I don’t know whether it 
is supported.




On Wed, Nov 1, 2017 at 6:37 AM Parag Khuraswar  wrote:



Hi Raj,



But I have two file systems,

And I think I can use one mgt for two filesystems. Please correct me if

I am wrong.



Regards,

Parag





On 2017-11-01 16:56, Raj wrote:

> The following can contribute to this issue:

> - Missing FS name in mgt creation (it must be <=9 character long):

> --fsname=

> mkfs.lustre --servicenode=10.2.1.204@o2ib

> --servicenode=10.2.1.205@o2ib --FSNAME=HOME --mgs /dev/mapper/mpathc

>

> - verify if /mdt directory exists

>

> On Wed, Nov 1, 2017 at 6:16 AM Raj  wrote:

>

>> What options in mkfs.lustre did you use to format with lustre?

>>

>> On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar

>>  wrote:

>>

>> Hi Raj,

>>

>> Yes, /dev/mapper/mpatha available.

>>

>> I could format and mount using ext4.



>>

>> Regards,

>>

>> Parag

>>

>> FROM: Raj [mailto:rajgau...@gmail.com]

>> SENT: Wednesday, November , 2017 4:39 PM

>> TO: Parag Khuraswar; Lustre discussion

>> SUBJECT: Re: [lustre-discuss] mdt mounting error

>>

>> Parag,

>> Is the device /dev/mapper/mpatha available?

>> If not, the multipathd may not have started or the multipath

>> configuration may not be correct.

>>

>> On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar

>>  wrote:

>>

>> Hi,

>>

>> I am getting below error while mounting mdt. Mgt is mounted.

>>

>> Please suggest

>>

>> [root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

>>

>> mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file

>> or directory

>>

>> Is the MGS specification correct?

>>

>> Is the filesystem name correct?

>>

>> If upgrading, is the copied client log valid? (see upgrade docs)

>>

>> Regards,

>>

>> Parag

>>

>> ___

>> lustre-discuss mailing list

>> lustre-discuss@lists.lustre.org

>> 
http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org









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Re: [lustre-discuss] mdt mounting error

[Ben Evans]

On the node in question Try: lsmod | grep lustre

followed by: modprobe lustre

I'm betting the modules aren't loaded for some reason, generally that reason is 
found in dmesg.

From: lustre-discuss 
>
 on behalf of Raj >
Date: Wednesday, November 1, 2017 at 7:48 AM
To: Parag Khuraswar >
Cc: Lustre discussion 
>
Subject: Re: [lustre-discuss] mdt mounting error

Parag, I have not tested two FS using a common MGT and I don’t know whether it 
is supported.

On Wed, Nov 1, 2017 at 6:37 AM Parag Khuraswar 
> wrote:
Hi Raj,

But I have two file systems,
And I think I can use one mgt for two filesystems. Please correct me if
I am wrong.

Regards,
Parag


On 2017-11-01 16:56, Raj wrote:
> The following can contribute to this issue:
> - Missing FS name in mgt creation (it must be <=9 character long):
> --fsname=
> mkfs.lustre --servicenode=10.2.1.204@o2ib
> --servicenode=10.2.1.205@o2ib --FSNAME=HOME --mgs /dev/mapper/mpathc
>
> - verify if /mdt directory exists
>
> On Wed, Nov 1, 2017 at 6:16 AM Raj 
> > wrote:
>
>> What options in mkfs.lustre did you use to format with lustre?
>>
>> On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar
>> > wrote:
>>
>> Hi Raj,
>>
>> Yes, /dev/mapper/mpatha available.
>>
>> I could format and mount using ext4.

>>
>> Regards,
>>
>> Parag
>>
>> FROM: Raj [mailto:rajgau...@gmail.com]
>> SENT: Wednesday, November , 2017 4:39 PM
>> TO: Parag Khuraswar; Lustre discussion
>> SUBJECT: Re: [lustre-discuss] mdt mounting error
>>
>> Parag,
>> Is the device /dev/mapper/mpatha available?
>> If not, the multipathd may not have started or the multipath
>> configuration may not be correct.
>>
>> On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar
>> > wrote:
>>
>> Hi,
>>
>> I am getting below error while mounting mdt. Mgt is mounted.
>>
>> Please suggest
>>
>> [root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt
>>
>> mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file
>> or directory
>>
>> Is the MGS specification correct?
>>
>> Is the filesystem name correct?
>>
>> If upgrading, is the copied client log valid? (see upgrade docs)
>>
>> Regards,
>>
>> Parag
>>
>> ___
>> lustre-discuss mailing list
>> lustre-discuss@lists.lustre.org
>> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org

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Re: [lustre-discuss] mdt mounting error

[Raj]

Parag, I have not tested two FS using a common MGT and I don’t know whether
it is supported.

On Wed, Nov 1, 2017 at 6:37 AM Parag Khuraswar 
wrote:

> Hi Raj,
>
> But I have two file systems,
> And I think I can use one mgt for two filesystems. Please correct me if
> I am wrong.
>
> Regards,
> Parag
>
>
> On 2017-11-01 16:56, Raj wrote:
> > The following can contribute to this issue:
> > - Missing FS name in mgt creation (it must be <=9 character long):
> > --fsname=
> > mkfs.lustre --servicenode=10.2.1.204@o2ib
> > --servicenode=10.2.1.205@o2ib --FSNAME=HOME --mgs /dev/mapper/mpathc
> >
> > - verify if /mdt directory exists
> >
> > On Wed, Nov 1, 2017 at 6:16 AM Raj  wrote:
> >
> >> What options in mkfs.lustre did you use to format with lustre?
> >>
> >> On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar
> >>  wrote:
> >>
> >> Hi Raj,
> >>
> >> Yes, /dev/mapper/mpatha available.
> >>
> >> I could format and mount using ext4.
>
> >>
> >> Regards,
> >>
> >> Parag
> >>
> >> FROM: Raj [mailto:rajgau...@gmail.com]
> >> SENT: Wednesday, November , 2017 4:39 PM
> >> TO: Parag Khuraswar; Lustre discussion
> >> SUBJECT: Re: [lustre-discuss] mdt mounting error
> >>
> >> Parag,
> >> Is the device /dev/mapper/mpatha available?
> >> If not, the multipathd may not have started or the multipath
> >> configuration may not be correct.
> >>
> >> On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar
> >>  wrote:
> >>
> >> Hi,
> >>
> >> I am getting below error while mounting mdt. Mgt is mounted.
> >>
> >> Please suggest
> >>
> >> [root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt
> >>
> >> mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file
> >> or directory
> >>
> >> Is the MGS specification correct?
> >>
> >> Is the filesystem name correct?
> >>
> >> If upgrading, is the copied client log valid? (see upgrade docs)
> >>
> >> Regards,
> >>
> >> Parag
> >>
> >> ___
> >> lustre-discuss mailing list
> >> lustre-discuss@lists.lustre.org
> >> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
>
>
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Re: [lustre-discuss] mdt mounting error

[Parag Khuraswar]

Hi Raj,

But I have two file systems,
And I think I can use one mgt for two filesystems. Please correct me if 
I am wrong.


Regards,
Parag


On 2017-11-01 16:56, Raj wrote:

The following can contribute to this issue:
- Missing FS name in mgt creation (it must be <=9 character long):
--fsname=
mkfs.lustre --servicenode=10.2.1.204@o2ib
--servicenode=10.2.1.205@o2ib --FSNAME=HOME --mgs /dev/mapper/mpathc

- verify if /mdt directory exists

On Wed, Nov 1, 2017 at 6:16 AM Raj  wrote:


What options in mkfs.lustre did you use to format with lustre?

On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar
 wrote:

Hi Raj,

Yes, /dev/mapper/mpatha available.

I could format and mount using ext4.




Regards,

Parag

FROM: Raj [mailto:rajgau...@gmail.com]
SENT: Wednesday, November , 2017 4:39 PM
TO: Parag Khuraswar; Lustre discussion
SUBJECT: Re: [lustre-discuss] mdt mounting error

Parag,
Is the device /dev/mapper/mpatha available?
If not, the multipathd may not have started or the multipath
configuration may not be correct.

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar
 wrote:

Hi,

I am getting below error while mounting mdt. Mgt is mounted.

Please suggest

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file
or directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see upgrade docs)

Regards,

Parag

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Re: [lustre-discuss] mdt mounting error

[Raj]

The following can contribute to this issue:
- Missing FS name in mgt creation (it must be <=9 character long): --fsname=
mkfs.lustre --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib
*--fsname=home* --mgs /dev/mapper/mpathc

- verify if /mdt directory exists



On Wed, Nov 1, 2017 at 6:16 AM Raj  wrote:

> What options in mkfs.lustre did you use to format with lustre?
> On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar 
> wrote:
>
>> Hi Raj,
>>
>>
>>
>> Yes, /dev/mapper/mpatha available.
>>
>> I could format and mount using ext4.
>>
>>
>>
>> Regards,
>>
>> Parag
>>
>>
>>
>>
>>
>> *From:* Raj [mailto:rajgau...@gmail.com]
>> *Sent:* Wednesday, November , 2017 4:39 PM
>> *To:* Parag Khuraswar; Lustre discussion
>> *Subject:* Re: [lustre-discuss] mdt mounting error
>>
>>
>>
>> Parag,
>> Is the device /dev/mapper/mpatha available?
>> If not, the multipathd may not have started or the multipath
>> configuration may not be correct.
>>
>> On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar 
>> wrote:
>>
>> Hi,
>>
>>
>>
>> I am getting below error while mounting mdt. Mgt is mounted.
>>
>>
>>
>> Please suggest
>>
>>
>>
>> [root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt
>>
>> mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or
>> directory
>>
>> Is the MGS specification correct?
>>
>> Is the filesystem name correct?
>>
>> If upgrading, is the copied client log valid? (see upgrade docs)
>>
>>
>>
>> Regards,
>>
>> Parag
>>
>>
>>
>>
>>
>> ___
>> lustre-discuss mailing list
>> lustre-discuss@lists.lustre.org
>> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
>>
>>
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Re: [lustre-discuss] mdt mounting error

[Parag Khuraswar]

Hi,

 

For mgt –

mkfs.lustre --servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mgs 
/dev/mapper/mpathc

 

For mdt 

mkfs.lustre --fsname=home --mgsnode=10.2.1.204@o2ib --mgsnode=10.2.1.205@o2ib 
--servicenode=10.2.1.204@o2ib --servicenode=10.2.1.205@o2ib --mdt --index=0 
/dev/mapper/mpatha

 

Regards,

Parag

 

 

From: Raj [mailto:rajgau...@gmail.com] 
Sent: Wednesday, November , 2017 4:46 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

What options in mkfs.lustre did you use to format with lustre?

On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar  wrote:

Hi Raj,

 

Yes, /dev/mapper/mpatha available. 

I could format and mount using ext4.

 

Regards,

Parag

 

 

From: Raj [mailto:rajgau...@gmail.com] 
Sent: Wednesday, November , 2017 4:39 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

Parag, 
Is the device /dev/mapper/mpatha available? 
If not, the multipathd may not have started or the multipath configuration may 
not be correct. 

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar  wrote:

Hi,

 

I am getting below error while mounting mdt. Mgt is mounted. 

 

Please suggest

 

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see upgrade docs)

 

Regards,

Parag

 

 

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Re: [lustre-discuss] mdt mounting error

[Parag Khuraswar]

Hi Raj,

 

Yes, /dev/mapper/mpatha available. 

I could format and mount using ext4.

 

Regards,

Parag

 

 

From: Raj [mailto:rajgau...@gmail.com] 
Sent: Wednesday, November , 2017 4:39 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

Parag, 
Is the device /dev/mapper/mpatha available? 
If not, the multipathd may not have started or the multipath configuration may 
not be correct. 

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar  wrote:

Hi,

 

I am getting below error while mounting mdt. Mgt is mounted. 

 

Please suggest

 

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see upgrade docs)

 

Regards,

Parag

 

 

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Re: [lustre-discuss] mdt mounting error

[Raj]

Parag,
Is the device /dev/mapper/mpatha available?
If not, the multipathd may not have started or the multipath configuration
may not be correct.

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar 
wrote:

> Hi,
>
>
>
> I am getting below error while mounting mdt. Mgt is mounted.
>
>
>
> Please suggest
>
>
>
> [root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt
>
> mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or
> directory
>
> Is the MGS specification correct?
>
> Is the filesystem name correct?
>
> If upgrading, is the copied client log valid? (see upgrade docs)
>
>
>
> Regards,
>
> Parag
>
>
>
>
> ___
> lustre-discuss mailing list
> lustre-discuss@lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
>
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[lustre-discuss] mdt mounting error

[Parag Khuraswar]

Hi,

 

I am getting below error while mounting mdt. Mgt is mounted. 

 

Please suggest

 

[root@mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or
directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see upgrade docs)

 

Regards,

Parag

 

 

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