On Thu, Feb 11, 2016 at 2:42 AM, Ravishankar N <ravishankar@redhat.com> wrote:
+gluster-users
Does disabling 'performance.write-behind' give a better throughput?
On 02/10/2016 11:06 PM, Bill James wrote:
I'm setting up a ovirt cluster using glusterfs and noticing not stellar performance. Maybe my setup could use some adjustments?
3 hardware nodes running centos7.2, glusterfs 3.7.6.1, ovirt 3.6.2.6-1. Each node has 8 spindles configured in 1 array which is split using LVM with one logical volume for system and one for gluster. They each have 4 NICs, NIC1 = ovirtmgmt NIC2 = gluster
How do you ensure that gluster trafic is using this nic?
NIC3 = VM traffic
How do you ensure that vm trafic is using this nic?
I tried with default glusterfs settings
And did you find any difference?
and also with: performance.cache-size: 1GB performance.readdir-ahead: on performance.write-behind-window-size: 4MB
[root@ovirt3 test scripts]# gluster volume info gv1
Volume Name: gv1 Type: Replicate Volume ID: 71afc35b-09d7-4384-ab22-57d032a0f1a2 Status: Started Number of Bricks: 1 x 3 = 3 Transport-type: tcp Bricks: Brick1: ovirt1-ks.test.j2noc.com:/gluster-store/brick1/gv1 Brick2: ovirt2-ks.test.j2noc.com:/gluster-store/brick1/gv1 Brick3: ovirt3-ks.test.j2noc.com:/gluster-store/brick1/gv1 Options Reconfigured: performance.cache-size: 1GB performance.readdir-ahead: on performance.write-behind-window-size: 4MB
Using simple dd test on VM in ovirt: dd if=/dev/zero of=/root/testfile bs=1G count=1 oflag=direct
block size of 1G?! Try 1M (our default for storage operations)
1073741824 bytes (1.1 GB) copied, 65.9337 s, 16.3 MB/s
Another VM not in ovirt using nfs: dd if=/dev/zero of=/root/testfile bs=1G count=1 oflag=direct 1073741824 bytes (1.1 GB) copied, 27.0079 s, 39.8 MB/s
Is that expected or is there a better way to set it up to get better performance?
Adding Niels for advice.
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