[ovirt-users] Re: Ovirt 4.3.10 Glusterfs SSD slow performance over 10GE

На 29 юни 2020 г. 4:14:33 GMT+03:00, jury cat <shadow.emy1(a)gmail.com&gt; написа: Actually only you can find out as we cannot know the workload of your VMs. ovirt 4.4 uses gluster v7 , but I have to warn you that several people has reported issues after upgrading from v6.5 to 6.6+ or from 7.0 to 7.1+ . It's still under investigation. You are using 64K stripe size , but usually Red Hat recommend either 128k for raid6 or 256k for raid10. In your case 256k sounds nice. Your stripe width will be 64k x 2 data disks = 128k So you should use : pvcreate --dataalignment 128k /dev/raid-device For details , check RHGS Documentation; https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5... Verify that the MTU is the same on egery device. As IP + ICMP stack need 28 bits , you can try: ping -M do -c 10 -s 8972 remote_gluster node Also, you can test lige changing the I/O scheduler. Gluster v8.0 is planned for community tests - it's too early for it - use the 4.4 default (v7.X). I can't claim those are universal, but here is mine : [main] summary=Optimize for running KVM guests on Gluster (Random IO) include=throughput-performance [cpu] governor=ondemand|powersave energy_perf_bias=powersave|power [sysctl] #vm.dirty_ratio = 5 #Random io -> 2 , vm host -> 5 #vm.dirty_background_ratio = 4 vm.dirty_background_bytes = 200000000 vm.dirty_bytes = 450000000 # The total time the scheduler will consider a migrated process # "cache hot" and thus less likely to be re-migrated # (system default is 500000, i.e. 0.5 ms) kernel.sched_migration_cost_ns = 5000000 I'm using powersave governor, as I'm chasing better power efficiency than performance . I would recommend you to take a look in the source rpm from the previous e-mail, which contains Red Hat's tuned profile. > >Thanks, >Emy