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

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=dsync
1+0 records in
1+0 records out
1073741824 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=dsync
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 36.8618 s, 29.1 MB/s

Does this performance look normal?
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