I got confused so far.What is best for oVirt ?remote-dio off or on ?My latest
gluster volumes were set to 'off' while the older ones are 'on'.
Best Regards,Strahil Nikolov
В понеделник, 20 май 2019 г., 23:42:09 ч. Гринуич+3, Darrell Budic
<[email protected]> написа:
Wow, I think Strahil and i both hit different edge cases on this one. I was
running that on my test cluster with a ZFS backed brick, which does not support
O_DIRECT (in the current version, 0.8 will, when it’s released). I tested on a
XFS backed brick with gluster virt group applied and network.remote-dio
disabled and ovirt was able to create the storage volume correctly. So not a
huge problem for most people, I imagine.
Now I’m curious about the apparent disconnect between gluster and ovirt though.
Since the gluster virt group sets network.remote-dio on, what’s the reasoning
behind disabling it for these tests?
On May 18, 2019, at 11:44 PM, Sahina Bose <[email protected]> wrote:
On Sun, 19 May 2019 at 12:21 AM, Nir Soffer <[email protected]> wrote:
On Fri, May 17, 2019 at 7:54 AM Gobinda Das <[email protected]> wrote:
>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 <[email protected]> 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
<[email protected]> написа:
On May 16, 2019, at 1:41 PM, Nir Soffer <[email protected]> wrote:
On Thu, May 16, 2019 at 8:38 PM Darrell Budic <[email protected]> wrote:
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 enablevolume set:
success[root@boneyard mnt]# dd if=/dev/zero of=testfile bs=4096 count=1
oflag=direct1+0 records in1+0 records out4096 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
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