1:25 a.m.
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Hi,
we just set up a new 4.1.2 OVirt cluster. It is a quite normal
HDD/XFS/NFS stack that worked quit well with 4.0 in the past.
Inside the VMs we use XFS too.
To our surprise we observe abysmal high IO during mkfs.xfs
and fstrim inside the VM. A simple example:
Step 1: Create 100G Thin disk
Result 1: Disk occupies ~10M on storage
Step 2: Format disk inside VM with mkfs.xfs
Result 2: Disk occupies 100G on storage
Changing the discard flag on the disk does not have any effect.
Am I missing something?
Best regards.
Markus
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<div>
<div>Hi, </div>
<div><br>
</div>
<div>we just set up a new 4.1.2 OVirt cluster. It is a quite normal</div>
<div>HDD/XFS/NFS stack that worked quit well with 4.0 in the past. </d=
iv>
<div>Inside the VMs we use XFS too.</div>
<div><br>
</div>
<div>To our surprise we observe abysmal high IO during
mkfs.xfs </div>
<div>and fstrim inside the VM. A simple example:</div>
<div><br>
</div>
<div>Step 1: Create 100G Thin disk</div>
<div>Result 1: Disk occupies ~10M on storage</div>
<div><br>
</div>
<div>Step 2: Format disk inside VM with mkfs.xfs</div>
<div>Result 2: Disk occupies 100G on storage</div>
<div><br>
</div>
<div>Changing the discard flag on the disk does not have any effect.</div>
<div><br>
</div>
<div>Am I missing something?</div>
<div><br>
</div>
<div>Best regards.</div>
<div><br>
</div>
<div>Markus</div>
</div>
</div>
</div>
</div>
</div>
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style=3D"display:none"></div>
</div>
</div>
</body>
</html>
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