Hi Strahil,
WARNING: As you enabled sharding - NEVER DISABLE SHARDING, EVER !
Thanks -- good to be reminded :)
>When you say they will not be optimal are you referring mainly to
>performance considerations? We did plenty of testing, and in terms of
>performance didn't have issues even with I/O intensive workloads (using
>SSDs, I had issues with spinning disks).
Yes, the client side has to connect to 6 bricks (4+2) at a time and calculate the data in order to obtain the necessary information.Same is valid for writing.
If you need to conserve space, you can test VDO without compression (of even with it).
Understood -- will explore VDO. Storage usage efficiency is less important than fault tolerance or performance for us -- disperse volumes seemed to tick all the boxes so we looked at them primarily.
But clearly I had missed that they are not used as mainstream VM storage for oVirt (I did know they weren't supported, but as explained thought was more on the management side).
Also with replica volumes, you can use 'choose-local' /in case you have faster than the network storage (like NVMe)/ and increase the read speed. Of course this feature is useful for Hyperconverged setup (gluster + ovirt on the same node).
Will explore this option as well, thanks for the suggestion.
If you were using ovirt 4.3 , I would recommend you to focus on gluster. Yet, you use oVirt 4.4 which is quite newer and it needs some polishing.
Ovirt 4.3.9 (using the older Centos 7 qemu/libvirt) unfortunately had similar issues with the disperse volumes. Not sure if exactly the same, as never looked deeper into it, but the results were similar.
Ovirt 4.4.0 has some issues with snapshot deletion that are independent from Gluster (I have raised the issue here, https://bugzilla.redhat.com/show_bug.cgi?id=1840414, should be sorted with 4.4.2 I guess), so at the moment it only works with the "testing" AV repo.
Check ovirt engine logs (on the HostedEngine VM or your standalone engine) , vdsm logs on the host that was running the VM and next - check the brick logs.
Will do.
Thanks,
Marco
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