[Gluster-users] Write Speed unusually slow when both bricks are online
jeff.forbes at mail.nacon.com
Tue Apr 2 20:25:47 UTC 2019
I have two CentOS-6 servers running version 3.12.14 of gluster-server.
Each server as one brick and they are configured to replicate between
the two bricks.
I also have two CentOS-6 servers running version 3.12.2-18 of
These servers use a separate VLAN. Each server has two bonded 1 Gbps
NICs to communicate the gluster traffic. File transfer speeds between
these servers using rsync approaches 100 MBps.
The client servers mount the gluster volume using this fstab entry:
192.168.40.30:gv0 /store glusterfs defaults, attribute-timeout=600,entry-timeout=600,negative-timeout=600,fopen-keep-cache,use-readdirp=no,log-level=WARNING 1 2
Reading data from the servers to the clients is similar to the rsync
speed. The problem is that writing from the clients to the mounted
gluster volume is less than 8 MB/s and fluctuates from less than 500
kB/s to 8 MB/s, as measured by the pv command. Using rsync, the speed
fluctuates between 2 and 5 MBps.
When the bonded nics on one of the gluster servers is shut down, the
write speed to the remaining online brick is now similar to the read
I can only assume that there is something wrong in my configuration,
since a greater than 10-fold decrease in write speed when the bricks
are replicating makes for an unusable system.
Does anyone have any ideas what the problem may be?
Server volume configuration:
> sudo gluster volume info
Volume Name: gv0
Volume ID: d96bbb99-f264-4655-95ff-f9f05ca9ff55
Snapshot Count: 0
Number of Bricks: 1 x 2 = 2
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