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.
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
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
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 OST
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
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] md
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 bui
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 direct
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
mailto:lustre-discuss-boun...@lists.lustre.org>>
on behalf of parag_k mailto:para...@citilindia.com>>
Date: Wednesday, November 1, 2017 at
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: [
> 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
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 questio
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
mailto:lustre-discuss-boun...@lists.lustre.org>>
on behalf of Raj mailto:rajgau...@gmail.com>>
Dat
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,
> Par
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=
mk
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
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/
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]
> *Sen
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 th
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 sugges
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?
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