[ovirt-users] Re: Connection issues when using gluster + infiniband + RDMA

[Matthew Hoberg]

My gluster volume is mounted with *.rdma. I cannot make changes to the switch 
as it doesn’t have any management to it as it is unmanaged. I can transfer 
files and run VMs from the gluster volume. I just receive these messages. I am 
using IBoIP. I have no problems doing a NFS over RDMA share from a second 
server that is also hooked up to the Infiniband switch.

From: Arman Khalatyan 
Date: Monday, August 13, 2018 at 2:21 PM
To: Matthew Hoberg 
Cc: users 
Subject: Re: [ovirt-users] Connection issues when using gluster + infiniband + 
RDMA

try to leave datagramm mode, do not change mtu. it looks like 
gluster is connected over the tcp/ipoib. you might get packets drops with mtu> 
2k. as i remember you should tune your ib switch for the mtu size,at least on 
the mellanox managed switch.

if the gluster connected over rdma it should not use any of tcp settings.
Is your mount -l shows that the gluster mounted with .rdma?

btw opensm should run only once, the others are going to stay in the  standby 
mode.
mailto:housemo...@squeakz.net>> schrieb am Mo., 13. 
Aug. 2018, 20:13:
I am trying to setup gluster using Infiniband and mounting it in RDMA mode. I 
have created a network hook so that it configures the interfaces as MTU=65520 
and CONNECTED_MODE=yes. I have a second server doing NFS with RDMA over 
Infiniband with some VMs on it. When I try and transfer files to the gluster 
storage it is taking a while and I am seeing the message “VDSM {hostname} 
command GetGlusterVolumeHealInfoVDS failed: Message timeout which can be caused 
by communication issues” This is usually followed by “Host {hostname} is not 
responding. It will stay in Connecting state for a grace period of 60 seconds 
and after that an attempt to fence the host will be issued.” I just installed 
the Infiniband hardware. The switch is a Qlogic 12200-18 with QLE7340 single 
port Infiniband cards in each of the 3 servers. The error message varies on 
which of the 3 nodes it comes from. Each of the 3 servers is running the opensm 
service.
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[ovirt-users] Re: oVirt 4.2.5 : VM snapshot creation does not work : command HSMGetAllTasksStatusesVDS failed: Could not acquire resource

[Nir Soffer]

On Mon, Aug 13, 2018 at 1:45 PM Aleksey Maksimov <
aleksey.i.maksi...@yandex.ru> wrote:

> We use oVirt 4.2.5.2-1.el7 (Hosted engine / 4 hosts in cluster / about
> twenty virtual machines)
> Virtual machine disks are located on the Data Domain from FC SAN.
> Snapshots of all virtual machines are created normally. But for one
> virtual machine, we can not create a snapshot.
>
> When we try to create a snapshot in the oVirt web console, we see such
> errors:
>
> Aug 13, 2018, 1:05:06 PM Failed to complete snapshot 'KOM-APP14_BACKUP01'
> creation for VM 'KOM-APP14'.
> Aug 13, 2018, 1:05:01 PM VDSM KOM-VM14 command HSMGetAllTasksStatusesVDS
> failed: Could not acquire resource. Probably resource factory threw an
> exception.: ()
> Aug 13, 2018, 1:05:00 PM Snapshot 'KOM-APP14_BACKUP01' creation for VM
> 'KOM-APP14' was initiated by pe...@sub.holding.com@sub.holding.com-authz.
>
> At this time on the server with the role of "SPM" in the vdsm.log we see
> this:
>
> ...
> 2018-08-13 05:05:06,471-0500 INFO  (jsonrpc/0) [jsonrpc.JsonRpcServer] RPC
> call VM.getStats succeeded in 0.00 seconds (__init__:573)
> 2018-08-13 05:05:06,478-0500 INFO  (jsonrpc/5) [jsonrpc.JsonRpcServer] RPC
> call Image.deleteVolumes succeeded in 0.05 seconds (__init__:573)
> 2018-08-13 05:05:06,478-0500 INFO  (tasks/3)
> [storage.ThreadPool.WorkerThread] START task
> bb45ae7e-77e9-4fec-9ee2-8e1f0ad3d589 (cmd= >, args=None)
> (threadPool:208)
> 2018-08-13 05:05:07,009-0500 WARN  (tasks/3) [storage.ResourceManager]
> Resource factory failed to create resource
> '01_img_6db73566-0f7f-4438-a9ef-6815075f45ea.cdf1751b-64d3-42bc-b9ef-b0174c7ea068'.
> Canceling request. (resourceManager:543)
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/site-packages/vdsm/storage/resourceManager.py",
> line 539, in registerResource
> obj = namespaceObj.factory.createResource(name, lockType)
>   File
> "/usr/lib/python2.7/site-packages/vdsm/storage/resourceFactories.py", line
> 193, in createResource
> lockType)
>   File
> "/usr/lib/python2.7/site-packages/vdsm/storage/resourceFactories.py", line
> 122, in __getResourceCandidatesList
> imgUUID=resourceName)
>   File "/usr/lib/python2.7/site-packages/vdsm/storage/image.py", line 213,
> in getChain
> if srcVol.isLeaf():
>   File "/usr/lib/python2.7/site-packages/vdsm/storage/volume.py", line
> 1430, in isLeaf
> return self._manifest.isLeaf()
>   File "/usr/lib/python2.7/site-packages/vdsm/storage/volume.py", line
> 139, in isLeaf
> return self.getVolType() == sc.type2name(sc.LEAF_VOL)
>   File "/usr/lib/python2.7/site-packages/vdsm/storage/volume.py", line
> 135, in getVolType
> self.voltype = self.getMetaParam(sc.VOLTYPE)
>   File "/usr/lib/python2.7/site-packages/vdsm/storage/volume.py", line
> 119, in getMetaParam
> meta = self.getMetadata()
>   File "/usr/lib/python2.7/site-packages/vdsm/storage/blockVolume.py",
> line 112, in getMetadata
> md = VolumeMetadata.from_lines(lines)
>   File "/usr/lib/python2.7/site-packages/vdsm/storage/volumemetadata.py",
> line 103, in from_lines
> "Missing metadata key: %s: found: %s" % (e, md))
> MetaDataKeyNotFoundError: Meta Data key not found error: ("Missing
> metadata key: 'DOMAIN': found: {'NONE':
> '##'}",)
>

Looks like you have a volume without metadata in the chain.

This may happen in the past when deleting a volume failed, but we
cleared the volume metadata. In current 4.2, this cannot happen, since
we clear the metadata only if deleting the volume succeeded.

Can you post complete vdsm log with this error?

Once we find the volume without metadata, we can delete the LV
using lvremove. This will fix the issue.

Shani, do you remember the bug we have with this error?
this probably the same issue.

Ala, I think we need to add a tool to check and repair such chains.

Nir
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[ovirt-users] Re: Connection issues when using gluster + infiniband + RDMA

[Arman Khalatyan]

try to leave datagramm mode, do not change mtu.  it looks
like gluster is connected over the tcp/ipoib. you might get packets drops
with mtu> 2k. as i remember you should tune your ib switch for the mtu
size,at least on the mellanox managed switch.

if the gluster connected over rdma it should not use any of tcp settings.
Is your mount -l shows that the gluster mounted with .rdma?

btw opensm should run only once, the others are going to stay in the
standby mode.

 schrieb am Mo., 13. Aug. 2018, 20:13:

> I am trying to setup gluster using Infiniband and mounting it in RDMA
> mode. I have created a network hook so that it configures the interfaces as
> MTU=65520 and CONNECTED_MODE=yes. I have a second server doing NFS with
> RDMA over Infiniband with some VMs on it. When I try and transfer files to
> the gluster storage it is taking a while and I am seeing the message “VDSM
> {hostname} command GetGlusterVolumeHealInfoVDS failed: Message timeout
> which can be caused by communication issues” This is usually followed by
> “Host {hostname} is not responding. It will stay in Connecting state for a
> grace period of 60 seconds and after that an attempt to fence the host will
> be issued.” I just installed the Infiniband hardware. The switch is a
> Qlogic 12200-18 with QLE7340 single port Infiniband cards in each of the 3
> servers. The error message varies on which of the 3 nodes it comes from.
> Each of the 3 servers is running the opensm service.
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[ovirt-users] Connection issues when using gluster + infiniband + RDMA

[Matthew Hoberg]

I am trying to setup gluster using Infiniband and mounting it in RDMA mode. I 
have created a network hook so that it configures the interfaces as MTU=65520 
and CONNECTED_MODE=yes. I have a second server doing NFS with RDMA over 
Infiniband with some VMs on it. When I try and transfer files to the gluster 
storage it is taking a while and I am seeing the message “VDSM {hostname} 
command GetGlusterVolumeHealInfoVDS failed: Message timeout which can be caused 
by communication issues” This is usually followed by “Host {hostname} is not 
responding. It will stay in Connecting state for a grace period of 60 seconds 
and after that an attempt to fence the host will be issued.” I just installed 
the Infiniband hardware. The switch is a Qlogic 12200-18 with QLE7340 single 
port Infiniband cards in each of the 3 servers. The error message varies on 
which of the 3 nodes it comes from. Each of the 3 servers is running the opensm 
service.

Thanks,

Matt
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[ovirt-users] Connection issues when using gluster + infiniband + RDMA

[housemouse]

I am trying to setup gluster using Infiniband and mounting it in RDMA mode. I 
have created a network hook so that it configures the interfaces as MTU=65520 
and CONNECTED_MODE=yes. I have a second server doing NFS with RDMA over 
Infiniband with some VMs on it. When I try and transfer files to the gluster 
storage it is taking a while and I am seeing the message “VDSM {hostname} 
command GetGlusterVolumeHealInfoVDS failed: Message timeout which can be caused 
by communication issues” This is usually followed by “Host {hostname} is not 
responding. It will stay in Connecting state for a grace period of 60 seconds 
and after that an attempt to fence the host will be issued.” I just installed 
the Infiniband hardware. The switch is a Qlogic 12200-18 with QLE7340 single 
port Infiniband cards in each of the 3 servers. The error message varies on 
which of the 3 nodes it comes from. Each of the 3 servers is running the opensm 
service.
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[ovirt-users] Passing through Quadro cards to guest

[Wesley Stewart]

Has anyone experimented with this?

I have had really good success with AMD cards, but consumer end graphics
cards fail to load due to NVIDIA blocking them.

I happened to have an NVIDIA Quadro P2000 lying around and I thought I
would give it a shot.  I really like these cards as they only require the
75W provided PCI power.

I can pass the Quadro through just fine, however after a couple minutes of
playing a video, the audio gets really "buzzy" and the video drops to about
3-5 FPS.  This is while doing pretty minimal stuff.  Currently testing with
720/1080 youtube videos.  Card is pulling about 6-10W total.  And otherwise
working fine on my Windows 10 guest.

I have also tried enabling/disabling MSI interrupts which the card supports
without making a difference.

I am running a single host setup:
X10SDV-6c+ (Xeon D - 1528)
running oVirt 4.2.3
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[ovirt-users] "ISCSI multipathing" tab isn't appear in datacenter settings

[navigator80]

Hello.

We have 6 servers in our cluster, which use 2 storage through iSCSI 
connections. Each storage has 2 nodes. Each node has 2 IP addresses in two 
different VLANs. Each host has 2 networks in this VLANs, so, the iSCSI traffic 
is separated from other types of traffic.
I want to turn on iSCSI multipathing beetween hosts and storage, but "ISCSI 
multipathing" tab isn't appear in datacenter settings. But when I'm add a 
additional storage domain, "ISCSI multipathing" tab is displaying. If I want to 
detach this additional storage domain, "ISCSI multipathing" tab is disappear at 
once.
Why is this happening?
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[ovirt-users] Re: Isolated POC

[Dan Yasny]

On Mon, Aug 13, 2018 at 4:22 PM Martin Schutte 
wrote:

> Hi there Dan,
>
> This is another very good suggestion. I am familiar with the RHEV repos,
> but not so much the upstream oVirt ones. As the POC is not based on RHEV, I
> am going to have to do this for oVirt.
>

I doubt there is much of a difference, you simply need to isolate the
required repos and download in bulk


>
> Regards,
> Martin.
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[ovirt-users] Re: Isolated POC

[Martin Schutte]

Hi there Dan,

This is another very good suggestion. I am familiar with the RHEV repos, but 
not so much the upstream oVirt ones. As the POC is not based on RHEV, I am 
going to have to do this for oVirt.

Regards,
Martin.
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[ovirt-users] Re: Isolated POC

[Martin Schutte]

I am using bare metal systems with all SSD drives. Going to do a vanilla 
install for oVirt.

I have given consideration to the dd idea, as it is a good one. I will have to 
take one of the systems out of the rack to install it offsite and return it. It 
might be worth it though given the time constraint.

The client is running a full production environment in the same data centre 
that we are using for the POC, so there is zero flexibility on the isolation 
policy. Bummer, I know.

Thanks for the idea on the offline install, I might decide to explore that a 
bot more

Regards,
Martin.
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[ovirt-users] Re: Isolated POC

[Dan Yasny]

This has been done for RHEV more times than I care to remember. As simple
as creating a local repo and copying it locally with reposync. You might
drag in some unneeded extras, but disk space is cheap and time is not.

So in short, clone the repos onto a USB drive, bring them to your
environment, and set up a local repo with createrepo. Continue with setup
as per the usual steps after that.

Cheers,
Dan

On Mon, Aug 13, 2018 at 2:02 PM Martin Schutte 
wrote:

> Good day to all,
>
> I am in the process of setting up an oVirt proof of concept for a client.
> There are some strict requirements for this POC.
>
> Firstly the entire POC must be isolated from the network, which means no
> online repos.
> Secondly there is a time constraint for the completion of the deployment.
> All to be done on bare-metal systems.
>
> I have installed oVirt numerous times on other systems, but then I was
> always able to have online repos. So in short I am asking for some pointers
> on which repos needs to be synced offline for this to work properly. I can
> always go and play around to figure out which ones are needed, but I do not
> have the luxury of time.
>
> Any advice or tips will be appreciated.
>
> Regards,
> Martin.
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[ovirt-users] Re: Isolated POC

[Gianluca Cecchi]

Il Lun 13 Ago 2018, 13:02 Martin Schutte  ha
scritto:

> Good day to all,
>
> I am in the process of setting up an oVirt proof of concept for a client.
> There are some strict requirements for this POC.
>
> Firstly the entire POC must be isolated from the network, which means no
> online repos.
> Secondly there is a time constraint for the completion of the deployment.
> All to be done on bare-metal systems.
>
> I have installed oVirt numerous times on other systems, but then I was
> always able to have online repos. So in short I am asking for some pointers
> on which repos needs to be synced offline for this to work properly. I can
> always go and play around to figure out which ones are needed, but I do not
> have the luxury of time.
>
> Any advice or tips will be appreciated.
>
> Regards,
> Martin.
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What kind of storage type are you going to use/test in this poc?
If any chance to get hand on similar hw compared to the target one, you
could try to setup inside a networked environment and then execute dd of
internal disks of hypervisors, having care that the original hw network
could match the isolated one of the customer.

BTW: could you detail, if possible, the level of isolation and the reasons
about it, in case in some way the client can be convinced to give some sort
of connectivity...?
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[ovirt-users] Re: Isolated POC

[Martin Schutte]

Hi there,

Yes I can confirm that having a yum proxy host is extremely useful. I have used 
it myself on a few occasions.

My problem is that the POC is completely isolated. No jump host to use as a 
proxy server. Separate switches and systems. 

So the only way I can see this working is by syncing the repos offline.

Thanks anyway for your response.

 Regards,
Martin.
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[ovirt-users] Re: Isolated POC

[Eduardo Mayoral]

Do not know if this is acceptable in your environment, but what I do is
to use an http proxy for yum access.

On the oVirt engine / compute nodes (CentOS 7) I set on /etc/yum.conf

http_proxy=http://your-proxy-server:your-proxy-port

http_caching=packages

The proxy side in my case is an apache server with mod_proxy and
mod_cache, but it can be any http proxy you want

May be suboptimal, but saves a ton of work in figuring out which repos
you need to mirror.

Good luck with your PoC,

--

Eduardo Mayoral.


On 13/08/18 13:01, Martin Schutte wrote:
> Good day to all,
>
> I am in the process of setting up an oVirt proof of concept for a client. 
> There are some strict requirements for this POC.
>
> Firstly the entire POC must be isolated from the network, which means no 
> online repos. 
> Secondly there is a time constraint for the completion of the deployment. All 
> to be done on bare-metal systems. 
>
> I have installed oVirt numerous times on other systems, but then I was always 
> able to have online repos. So in short I am asking for some pointers on which 
> repos needs to be synced offline for this to work properly. I can always go 
> and play around to figure out which ones are needed, but I do not have the 
> luxury of time.
>
> Any advice or tips will be appreciated.
>
> Regards,
> Martin.
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[ovirt-users] Re: Isolated POC

[Florian Schmid]

Hi Martin,

I had the same issue with the offline repo one year ago and for me it was quite 
difficult to setup.
The repos, they need are changing from time to time and I always have to test 
on a dev system, where I first install the new ovirt repo rpm to see which 
changes have been made and then download missing repos.

Also, not all repos they use are accessible by rsync and the ones with rsync, I 
had to exclude a lot not to download everything...

If there is a better method, I would appreciate it.

BR Florian Schmid


 
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- Ursprüngliche Mail -
Von: "Martin Schutte" 
An: "users" 
Gesendet: Montag, 13. August 2018 13:01:55
Betreff: [ovirt-users] Isolated POC

Good day to all,

I am in the process of setting up an oVirt proof of concept for a client. There 
are some strict requirements for this POC.

Firstly the entire POC must be isolated from the network, which means no online 
repos. 
Secondly there is a time constraint for the completion of the deployment. All 
to be done on bare-metal systems. 

I have installed oVirt numerous times on other systems, but then I was always 
able to have online repos. So in short I am asking for some pointers on which 
repos needs to be synced offline for this to work properly. I can always go and 
play around to figure out which ones are needed, but I do not have the luxury 
of time.

Any advice or tips will be appreciated.

Regards,
Martin.
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[ovirt-users] Isolated POC

[Martin Schutte]

Good day to all,

I am in the process of setting up an oVirt proof of concept for a client. There 
are some strict requirements for this POC.

Firstly the entire POC must be isolated from the network, which means no online 
repos. 
Secondly there is a time constraint for the completion of the deployment. All 
to be done on bare-metal systems. 

I have installed oVirt numerous times on other systems, but then I was always 
able to have online repos. So in short I am asking for some pointers on which 
repos needs to be synced offline for this to work properly. I can always go and 
play around to figure out which ones are needed, but I do not have the luxury 
of time.

Any advice or tips will be appreciated.

Regards,
Martin.
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[ovirt-users] Re: oVirt node 4.2.x - custom multipath.conf and external storage availability

[Aleksey Maksimov]

Hello Roberto

I solved a similar problem by adding an additional line "# VDSM PRIVATE" to the 
beginning of the file /etc/multipath.conf
For example, the beginning of the file looks like this:

# VDSM REVISION 1.3
# VDSM PRIVATE
…

This prevents configuration overwriting.
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[ovirt-users] oVirt 4.2.5 : VM snapshot creation does not work : command HSMGetAllTasksStatusesVDS failed: Could not acquire resource

[Aleksey Maksimov]

Hello

We use oVirt 4.2.5.2-1.el7 (Hosted engine / 4 hosts in cluster / about twenty 
virtual machines)
Virtual machine disks are located on the Data Domain from FC SAN.
Snapshots of all virtual machines are created normally. But for one virtual 
machine, we can not create a snapshot.

When we try to create a snapshot in the oVirt web console, we see such errors:

Aug 13, 2018, 1:05:06 PM Failed to complete snapshot 'KOM-APP14_BACKUP01' 
creation for VM 'KOM-APP14'. 
Aug 13, 2018, 1:05:01 PM VDSM KOM-VM14 command HSMGetAllTasksStatusesVDS 
failed: Could not acquire resource. Probably resource factory threw an 
exception.: () 
Aug 13, 2018, 1:05:00 PM Snapshot 'KOM-APP14_BACKUP01' creation for VM 
'KOM-APP14' was initiated by pe...@sub.holding.com@sub.holding.com-authz. 

At this time on the server with the role of "SPM" in the vdsm.log we see this:

...
2018-08-13 05:05:06,471-0500 INFO  (jsonrpc/0) [jsonrpc.JsonRpcServer] RPC call 
VM.getStats succeeded in 0.00 seconds (__init__:573)
2018-08-13 05:05:06,478-0500 INFO  (jsonrpc/5) [jsonrpc.JsonRpcServer] RPC call 
Image.deleteVolumes succeeded in 0.05 seconds (__init__:573)
2018-08-13 05:05:06,478-0500 INFO  (tasks/3) [storage.ThreadPool.WorkerThread] 
START task bb45ae7e-77e9-4fec-9ee2-8e1f0ad3d589 (cmd=>, args=None) 
(threadPool:208)
2018-08-13 05:05:07,009-0500 WARN  (tasks/3) [storage.ResourceManager] Resource 
factory failed to create resource 
'01_img_6db73566-0f7f-4438-a9ef-6815075f45ea.cdf1751b-64d3-42bc-b9ef-b0174c7ea068'.
 Canceling request. (resourceManager:543)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/storage/resourceManager.py", line 
539, in registerResource
obj = namespaceObj.factory.createResource(name, lockType)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/resourceFactories.py", 
line 193, in createResource
lockType)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/resourceFactories.py", 
line 122, in __getResourceCandidatesList
imgUUID=resourceName)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/image.py", line 213, in 
getChain
if srcVol.isLeaf():
  File "/usr/lib/python2.7/site-packages/vdsm/storage/volume.py", line 1430, in 
isLeaf
return self._manifest.isLeaf()
  File "/usr/lib/python2.7/site-packages/vdsm/storage/volume.py", line 139, in 
isLeaf
return self.getVolType() == sc.type2name(sc.LEAF_VOL)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/volume.py", line 135, in 
getVolType
self.voltype = self.getMetaParam(sc.VOLTYPE)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/volume.py", line 119, in 
getMetaParam
meta = self.getMetadata()
  File "/usr/lib/python2.7/site-packages/vdsm/storage/blockVolume.py", line 
112, in getMetadata
md = VolumeMetadata.from_lines(lines)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/volumemetadata.py", line 
103, in from_lines
"Missing metadata key: %s: found: %s" % (e, md))
MetaDataKeyNotFoundError: Meta Data key not found error: ("Missing metadata 
key: 'DOMAIN': found: {'NONE': 
'##'}",)
2018-08-13 05:05:07,010-0500 WARN  (tasks/3) [storage.ResourceManager.Request] 
(ResName='01_img_6db73566-0f7f-4438-a9ef-6815075f45ea.cdf1751b-64d3-42bc-b9ef-b0174c7ea068',
 ReqID='3d924e5e-60d1-47b0-86a7-c63585b56f09') Tried to cancel a processed 
request (resourceManager:187)
2018-08-13 05:05:07,010-0500 ERROR (tasks/3) [storage.TaskManager.Task] 
(Task='bb45ae7e-77e9-4fec-9ee2-8e1f0ad3d589') Unexpected error (task:875)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/storage/task.py", line 882, in 
_run
return fn(*args, **kargs)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/task.py", line 336, in run
return self.cmd(*self.argslist, **self.argsdict)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/securable.py", line 79, 
in wrapper
return method(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/sp.py", line 1966, in 
deleteVolume
with rm.acquireResource(img_ns, imgUUID, rm.EXCLUSIVE):
  File "/usr/lib/python2.7/site-packages/vdsm/storage/resourceManager.py", line 
1025, in acquireResource
return _manager.acquireResource(namespace, name, lockType, timeout=timeout)
  File "/usr/lib/python2.7/site-packages/vdsm/storage/resourceManager.py", line 
475, in acquireResource
raise se.ResourceAcqusitionFailed()
ResourceAcqusitionFailed: Could not acquire resource. Probably resource factory 
threw an exception.: ()

[ovirt-users] Re: oVirt node 4.2.x - custom multipath.conf and external storage availability

[Roberto Nunin]

Hi all

any  feedback about ?

Thanks

Il giorno mar 31 lug 2018 alle ore 13:45 Roberto Nunin 
ha scritto:

> HI all
>
> How can I provide to my oVirt hosts a custom multipath.conf, considering
> that we are using shared/mirrored FC storage from HPE 3PAR with high
> availability of provided LUNs, using peer-persistance feature ?
>
> To configure correctly this require  a custom multipath.conf is required.
> How I can avoid it will be overwritten during upgrades ?
>
> Second topic:
> Is ALUA feature supported also in oVirt nodes, like for standard RHEL 6/7
> and/or CentOS 6/7 ?
>
> I was digging  for a while into user's digest, but not able to find
> focused informations.
>
> This is the feature needed by peer-persistance, allowing two different
> volumes to be masked toward a given host with the same WWN and LUN number.
>
> Thanks in advance
>
> --
> Roberto
>
>
>
>

-- 
Roberto
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[ovirt-users] Re: ovirt engine service needs restart after network connectivity is lost and reestablished

[Sahina Bose]

On Fri, Aug 10, 2018 at 10:08 PM,  wrote:

> today our network administration did some upgrades on the networking
> equipment, so the engine vlan went down for a while. Afterwards when it
> came back up 3 hosts was found as non responding, I couldn't see anything
> suspicious on the hosts, the problem "fixed" itself when I restarted the
> ovirt-engine service on the engine vm.
> Another "strange" side effect is that gluster was in need of healing
> constantly afterwards it did heal and desynch again almost immediately,
> whitch was "fixed" by shutting down and starting the vm's who were up at
> the time of the network outage..
> I've seen this behaviour once more regarding the engine service, is this
> normal behaviour (e.g. to make the admin check if everything is ok) or is
> there something wrong  ?
>


This is not normal. The engine.log from the time you experienced problem
would help identify issue.


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>
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