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