Hi,
we just set up a new 4.1.2 OVirt cluster. It is a quite normalHDD/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.xfsand fstrim inside the VM. A simple example:
Step 1: Create 100G Thin diskResult 1: Disk occupies ~10M on storage
Step 2: Format disk inside VM with mkfs.xfsResult 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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