I had similar problems until I clicked "optimize volume for vmstore" in the admin GUI for each data volume.  I'm not sure if this is what is causing your problem here but I'd recommend trying that first.  It is suppose to be optimized by default but for some reason my ovirt 4.2 cockpit deploy did not apply those settings automatically. 

On Thu, Sep 13, 2018 at 10:21 AM Leo David <leoalex@gmail.com> wrote:

Hi Everyone,

I am encountering the following issue on a single instance hyper-converged 4.2 setup.

The following fio test was done:

fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randwrite

The results are very poor doing the test inside of a vm with a prealocated disk on the ssd store:  ~2k IOPS

Same test done on the oVirt node directly on the mounted ssd_lvm: ~30k IOPS

Same test done, this time on the gluster mount path: ~20K IOPS 

What could be the issue that the vms have this slow hdd performance ( 2k on ssd !! )?

Thank you very much !

--

Best regards, Leo David

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