Emy, I was wondering how much if any improvement I'd see with Gluster storage moving to oVirt 4.4/CentOS 8x (but have not made the switch yet myself). You should keep in mind that your Perc controllers aren't supported by CentOS 8 out of the box, they dropped support for many older controllers. You should still be able to get it to work using a driver update disk during install. See: https://forums.centos.org/viewtopic.php?t=71862
Either way, this is good to know ahead of time as to limit surprises! - Jayme On Tue, Jul 7, 2020 at 10:22 AM shadow emy <[email protected]> wrote: > i found the problem. > The kernel version in Centos 7.8 with version 3.x.x is really too old and > does not know how to handle fine new SSD disks or RAID Controllers with > latest BIOS Updates applied. > > Booting and Archlinux latest iso image with kernel 5.7.6 or a Centos 8.2 > with kernel 4.18 increased the performance at the right values. > I run multiple dd tests on the above images using bs of 10, 100 and 1000M > and had aconstant write speed of 1.1GB/s.This is the expected value for 2 > SSD in RAID 0. > > I had also enabled cache settings on the Dell Perc 710 Raid controller : > Write Cache set to "Write Back", disk cache set to "Enabled", read cache to > "Read Ahead".For those who think "Write back" is a problem and the data > might be corrupted, this should be ok now with the latest filesystem xfs or > ext4 , that can recover in case of power loss.To make data safer, i also > have a Raid cache battery and UPS redundancy. > > Now i know i must run ovirt 4.4 with Centos 8.2 for good performance. > I saw that Upgrading from 4.3 to 4.4 is not an easy task, multiple fails > and not quite straight forward(i also have hosted engine on the shared > Gluster Storage which makes this ipgrade even more difficult), but > eventually i think i can get it running. > > Thanks, > Emy > _______________________________________________ > Users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > Privacy Statement: https://www.ovirt.org/privacy-policy.html > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/[email protected]/message/ZOFENYMPKXC6Z6MHOFFAUPPQCUFDNKHO/ >
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