OK, Can we summarize it: 1. VDO must 'emulate512=true' 2. 'network.remote-dio' should be off ? As per this: https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3/html... We should have these: quick-read=off read-ahead=off io-cache=off stat-prefetch=off eager-lock=enable remote-dio=on quorum-type=auto server-quorum-type=server I'm a little bit confused here. Best Regards, Strahil NikolovOn May 19, 2019 07:44, Sahina Bose <sabose@redhat.com> wrote:

On Sun, 19 May 2019 at 12:21 AM, Nir Soffer <nsoffer@redhat.com> wrote:

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On Fri, May 17, 2019 at 7:54 AM Gobinda Das <godas@redhat.com> wrote:

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From RHHI side default we are setting below volume options:

{ group: 'virt',      storage.owner-uid: '36',      storage.owner-gid: '36',      network.ping-timeout: '30',      performance.strict-o-direct: 'on',      network.remote-dio: 'off'

According to the user reports, this configuration is not compatible with oVirt.

Was this tested?

Yes, this is set by default in all test configuration. We’re checking on the bug, but the error is likely when the underlying device does not support 512b writes.  With network.remote-dio off gluster will ensure o-direct writes

...

...

   }

On Fri, May 17, 2019 at 2:31 AM Strahil Nikolov <hunter86_bg@yahoo.com> wrote:

...

Ok, setting 'gluster volume set data_fast4 network.remote-dio on' allowed me to create the storage domain without any issues. I set it on all 4 new gluster volumes and the storage domains were successfully created.

I have created bug for that: https://bugzilla.redhat.com/show_bug.cgi?id=1711060

If someone else already opened - please ping me to mark this one as duplicate.

Best Regards, Strahil Nikolov

В четвъртък, 16 май 2019 г., 22:27:01 ч. Гринуич+3, Darrell Budic <budic@onholyground.com> написа:

On May 16, 2019, at 1:41 PM, Nir Soffer <nsoffer@redhat.com> wrote:

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On Thu, May 16, 2019 at 8:38 PM Darrell Budic <budic@onholyground.com> wrote:

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I tried adding a new storage domain on my hyper converged test cluster running Ovirt 4.3.3.7 and gluster 6.1. I was able to create the new gluster volume fine, but it’s not able to add the gluster storage domain (as either a managed gluster volume or directly entering values). The created gluster volume mounts and looks fine from the CLI. Errors in VDSM log:

... 

...

2019-05-16 10:25:09,584-0500 ERROR (jsonrpc/5) [storage.fileSD] Underlying file system doesn't supportdirect IO (fileSD:110) 2019-05-16 10:25:09,584-0500 INFO  (jsonrpc/5) [vdsm.api] FINISH createStorageDomain error=Storage Domain target is unsupported: () from=::ffff:10.100.90.5,44732, flow_id=31d993dd, task_id=ecea28f3-60d4-476d-9ba8-b753b7c9940d (api:52)

The direct I/O check has failed.

So something is wrong in the files system.

To confirm, you can try to do:

dd if=/dev/zero of=/path/to/mountoint/test bs=4096 count=1 oflag=direct

This will probably fail with: dd: failed to open '/path/to/mountoint/test': Invalid argument

If it succeeds, but oVirt fail to connect to this domain, file a bug and we will investigate.

Nir

Yep, it fails as expected. Just to check, it is working on pre-existing volumes, so I poked around at gluster settings for the new volume. It has network.remote-dio=off set on the new volume, but enabled on old volumes. After enabling it, I’m able to run the dd test:

[root@boneyard mnt]# gluster vol set test network.remote-dio enable volume set: success [root@boneyard mnt]# dd if=/dev/zero of=testfile bs=4096 count=1 oflag=direct 1+0 records in 1+0 records out 4096 bytes (4.1 kB) copied, 0.0018285 s, 2.2 MB/s

I’m also able to add the storage domain in ovirt now.

I see network.remote-dio=enable is part of the gluster virt group, so apparently it’s not getting set by ovirt duding the volume creation/optimze for storage?

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Thanks, Gobinda