Hi Everyone,

So i have decided to take out all of the gluster volume custom options,  and add them one by one while activating/deactivating the storage domain & rebooting one vm after each  added option :(

The default options that giving bad iops ( ~1-2k) performance are :

performance.stat-prefetch on
cluster.eager-lock enable
performance.io-cache off
performance.read-ahead off
performance.quick-read off
user.cifs off
network.ping-timeout 30
network.remote-dio off
performance.strict-o-direct on
performance.low-prio-threads 32

After adding only:

server.allow-insecure on
features.shard on
storage.owner-gid 36
storage.owner-uid 36
transport.address-family inet
nfs.disable on

The performance increased to 7k-10k iops.

The problem is that i don't know if that's sufficient ( maybe it can be more improved ) , or even worse than this there might be chances to into different volume issues by taking out some volume really needed options... 

If would have handy the default options that are applied to volumes as optimization in a 3way replica, I think that might help..

Any thoughts ?

Thank you very much !

Leo

On Fri, Sep 14, 2018 at 8:54 AM, Leo David <leoalex@gmail.com> wrote:

Any thoughs on these ? Is that UI optimization only a gluster volume custom configuration ? If so, i guess it can be done from cli, but I am not aware of the corect optimized parameters of the volume....

On Thu, Sep 13, 2018, 18:25 Leo David <leoalex@gmail.com> wrote:

Thank you Jayme. I am trying to do this, but I am getting an error, since the volume is replica 1 distribute, and it seems that oVirt expects a replica 3 volume.

Would it be another way to optimize the volume in this situation ?

On Thu, Sep 13, 2018, 17:49 Jayme <jaymef@gmail.com> wrote:

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 !

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Best regards, Leo David

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Best regards, Leo David