[ovirt-users] Re: Gluster volume slower then raid1 zpool speed

No, that doesn't look right. I have a testbed cluster that has a single 1G network (1500 mtu) it is replica 2 + arbiter on top of 7200 rpms spinning drives formatted with XFS This cluster runs Gluster 6.10 on Ubuntu 18 on some Dell i5-2xxx boxes that were lying around. it uses a stock 'virt' group tuning which provides the following: root@onetest2:~/datastores/101# cat /var/lib/glusterd/groups/virt performance.quick-read=off performance.read-ahead=off performance.io-cache=off performance.low-prio-threads=32 network.remote-dio=enable cluster.eager-lock=enable cluster.quorum-type=auto cluster.server-quorum-type=server cluster.data-self-heal-algorithm=full cluster.locking-scheme=granular cluster.shd-max-threads=8 cluster.shd-wait-qlength=10000 features.shard=on user.cifs=off cluster.choose-local=off client.event-threads=4 server.event-threads=4 performance.client-io-threads=on I show the following results on your test. Note: the cluster is actually doing some work with 3 Vms running doing monitoring things. The bare metal performance is as follows: root@onetest2:/# dd if=/dev/zero of=/test12.img bs=1G count=1 oflag=dsync 1+0 records in 1+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 11.0783 s, 96.9 MB/s root@onetest2:/# dd if=/dev/zero of=/test12.img bs=1G count=1 oflag=dsync 1+0 records in 1+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 11.5047 s, 93.3 MB/s Moving over to the Gluster mount I show the following: root@onetest2:~/datastores/101# dd if=/dev/zero of=/test12.img bs=1G count=1 oflag=dsync 1+0 records in 1+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 11.4582 s, 93.7 MB/s root@onetest2:~/datastores/101# dd if=/dev/zero of=/test12.img bs=1G count=1 oflag=dsync 1+0 records in 1+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 12.2034 s, 88.0 MB/s So a little performance hit with Gluster but almost insignificant given that other things were going on. I don't know if you are in a VM environment but if so you could try the virt tuning. gluster volume set VOLUME group virt Unfortunately, I know little about ZFS so I can't comment on its performance, but your gluster results should be closer to the bare metal performance. Also note I am using an Arbiter, so that is less work than Replica 3. With a true Replica 3 I would expect the Gluster results to be lower, maybe as low as 60-70 MB/s range -wk On 11/25/2020 2:29 AM, Harry O wrote: > Unfortunately I didn't get any improvement by upgrading the > network. > Bare metal (zfs raid1 zvol):dd if=/dev/zero > of=/gluster_bricks/test1.img bs=1G count=1 oflag=dsync1+0 records > in1+0 records out1073741824 bytes (1.1 GB, 1.0 GiB) copied, 15.6471 > s, 68.6 MB/s > Centos VM on gluster volume:dd if=/dev/zero of=/test12.img bs=1G > count=1 oflag=dsync1+0 records in1+0 records out1073741824 bytes > (1.1 GB, 1.0 GiB) copied, 36.8618 s, 29.1 MB/s > Does this performance look > normal?_______________________________________________Users mailing > list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)ovirt.org > 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/users@ovirt.org/message/5ZKRIMXDVN3... > > _______________________________________________Users mailing list -- users(a)ovirt.org To unsubscribe send an email to users-leave(a)ovirt.org 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/users@ovirt.org/message/J27OKT7IRWZ...