oVirt cluster with glusterfs data domain - very slow writing speed on Windows server VM

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Hi folks,

 I have been experimenting with oVirt cluster based on glusterfs for the past few days. (first-timer). The cluster is up and running and it consists of 4 nodes and has 4 replicas. When I try to deploy Windows Server VM I encounter the following issue: The disk of the VM has ok reading speed ( close to bare metal) but the writing speed is very slow. ( about 10 times slower than it is supposed to be). Can anyone give me any suggestion, please? Thanks in advance! Here are the settings of the glusterfs volume:

Volume Name: bottle-volume
Type: Replicate
Volume ID: 869b8d1e-1266-4820-8dcd-4fea92346b90
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 4 = 4
Transport-type: tcp
Bricks:
Brick1: cnode01.bottleship.local:/gluster_bricks/brick-cnode01/brick-cnode01
Brick2: cnode02.bottleship.local:/gluster_bricks/brick-cnode02/brick-cnode02
Brick3: cnode03.bottleship.local:/gluster_bricks/brick-cnode03/brick-cnode03
Brick4: cnode04.bottleship.local:/gluster_bricks/brick-cnode04/brick-cnode04
Options Reconfigured:
network.ping-timeout: 30
cluster.granular-entry-heal: enable
performance.strict-o-direct: on
storage.owner-gid: 36
storage.owner-uid: 36
server.event-threads: 4
client.event-threads: 4
cluster.choose-local: off
features.shard: on
cluster.shd-wait-qlength: 10000
cluster.shd-max-threads: 8
cluster.locking-scheme: granular
cluster.data-self-heal-algorithm: full
cluster.server-quorum-type: server
cluster.quorum-type: auto
cluster.eager-lock: enable
network.remote-dio: off
performance.low-prio-threads: 32
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
auth.allow: *
user.cifs: off
transport.address-family: inet
nfs.disable: on
performance.client-io-threads: off
server.allow-insecure: on

Please let me know if you need any more configuration info or hardware specs.

best,

Lyubo





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