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don't know if it helps, but I ran a few more tests, all from the
same hardware node.<br>
<br>
The VM:<br>
[root@billjov1 ~]# time dd if=/dev/zero of=/root/testfile bs=1M
count=1000 oflag=direct<br>
1048576000 bytes (1.0 GB) copied, 62.5535 s, 16.8 MB/s<br>
<br>
Writing directly to gluster volume:<br>
[root@ovirt2 test ~]# time dd if=/dev/zero
of=/gluster-store/brick1/gv1/testfile bs=1M count=1000 oflag=direct<br>
1048576000 bytes (1.0 GB) copied, 9.92048 s, 106 MB/s<br>
<br>
<br>
Writing to NFS volume:<br>
[root@ovirt2 test ~]# time dd if=/dev/zero
of=/mnt/storage/qa/testfile bs=1M count=1000 oflag=direct<br>
1048576000 bytes (1.0 GB) copied, 10.5776 s, 99.1 MB/s<br>
<br>
NFS & Gluster are using the same interface. Tests were not run
at same time.<br>
<br>
This would suggest my problem isn't glusterfs, but the VM
performance.<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 02/11/2016 03:13 PM, Bill James
wrote:<br>
</div>
<blockquote cite="mid:56BD1589.8090506@j2.com" type="cite">xml
attached.
<br>
<br>
<br>
On 02/11/2016 12:28 PM, Nir Soffer wrote:
<br>
<blockquote type="cite">On Thu, Feb 11, 2016 at 8:27 PM, Bill
James <a class="moz-txt-link-rfc2396E" href="mailto:bill.james@j2.com"><bill.james@j2.com></a> wrote:
<br>
<blockquote type="cite">thank you for the reply.
<br>
<br>
We setup gluster using the names associated with NIC 2 IP.
<br>
Brick1: ovirt1-ks.test.j2noc.com:/gluster-store/brick1/gv1
<br>
Brick2: ovirt2-ks.test.j2noc.com:/gluster-store/brick1/gv1
<br>
Brick3: ovirt3-ks.test.j2noc.com:/gluster-store/brick1/gv1
<br>
<br>
That's NIC 2's IP.
<br>
Using 'iftop -i eno2 -L 5 -t' :
<br>
<br>
dd if=/dev/zero of=/root/testfile bs=1M count=1000
oflag=direct
<br>
1048576000 bytes (1.0 GB) copied, 68.0714 s, 15.4 MB/s
<br>
</blockquote>
Can you share the xml of this vm? You can find it in vdsm log,
<br>
at the time you start the vm.
<br>
<br>
Or you can do (on the host):
<br>
<br>
# virsh
<br>
virsh # list
<br>
(username: vdsm@ovirt password: shibboleth)
<br>
virsh # dumpxml vm-id
<br>
<br>
<blockquote type="cite">Peak rate
(sent/received/total): 281Mb 5.36Mb
<br>
282Mb
<br>
Cumulative (sent/received/total): 1.96GB
14.6MB
<br>
1.97GB
<br>
<br>
gluster volume info gv1:
<br>
Options Reconfigured:
<br>
performance.write-behind-window-size: 4MB
<br>
performance.readdir-ahead: on
<br>
performance.cache-size: 1GB
<br>
performance.write-behind: off
<br>
<br>
performance.write-behind: off didn't help.
<br>
Neither did any other changes I've tried.
<br>
<br>
<br>
There is no VM traffic on this VM right now except my test.
<br>
<br>
<br>
<br>
On 02/10/2016 11:55 PM, Nir Soffer wrote:
<br>
<blockquote type="cite">On Thu, Feb 11, 2016 at 2:42 AM,
Ravishankar N <a class="moz-txt-link-rfc2396E" href="mailto:ravishankar@redhat.com"><ravishankar@redhat.com></a>
<br>
wrote:
<br>
<blockquote type="cite">+gluster-users
<br>
<br>
Does disabling 'performance.write-behind' give a better
throughput?
<br>
<br>
<br>
<br>
On 02/10/2016 11:06 PM, Bill James wrote:
<br>
<blockquote type="cite">I'm setting up a ovirt cluster
using glusterfs and noticing not stellar
<br>
performance.
<br>
Maybe my setup could use some adjustments?
<br>
<br>
3 hardware nodes running centos7.2, glusterfs 3.7.6.1,
ovirt 3.6.2.6-1.
<br>
Each node has 8 spindles configured in 1 array which is
split using LVM
<br>
with one logical volume for system and one for gluster.
<br>
They each have 4 NICs,
<br>
NIC1 = ovirtmgmt
<br>
NIC2 = gluster (1GbE)
<br>
</blockquote>
</blockquote>
How do you ensure that gluster trafic is using this nic?
<br>
<br>
<blockquote type="cite">
<blockquote type="cite"> NIC3 = VM traffic
<br>
</blockquote>
</blockquote>
How do you ensure that vm trafic is using this nic?
<br>
<br>
<blockquote type="cite">
<blockquote type="cite">I tried with default glusterfs
settings
<br>
</blockquote>
</blockquote>
And did you find any difference?
<br>
<br>
<blockquote type="cite">
<blockquote type="cite">and also with:
<br>
performance.cache-size: 1GB
<br>
performance.readdir-ahead: on
<br>
performance.write-behind-window-size: 4MB
<br>
<br>
[root@ovirt3 test scripts]# gluster volume info gv1
<br>
<br>
Volume Name: gv1
<br>
Type: Replicate
<br>
Volume ID: 71afc35b-09d7-4384-ab22-57d032a0f1a2
<br>
Status: Started
<br>
Number of Bricks: 1 x 3 = 3
<br>
Transport-type: tcp
<br>
Bricks:
<br>
Brick1:
ovirt1-ks.test.j2noc.com:/gluster-store/brick1/gv1
<br>
Brick2:
ovirt2-ks.test.j2noc.com:/gluster-store/brick1/gv1
<br>
Brick3:
ovirt3-ks.test.j2noc.com:/gluster-store/brick1/gv1
<br>
Options Reconfigured:
<br>
performance.cache-size: 1GB
<br>
performance.readdir-ahead: on
<br>
performance.write-behind-window-size: 4MB
<br>
<br>
<br>
Using simple dd test on VM in ovirt:
<br>
dd if=/dev/zero of=/root/testfile bs=1G count=1
oflag=direct
<br>
</blockquote>
</blockquote>
block size of 1G?!
<br>
<br>
Try 1M (our default for storage operations)
<br>
<br>
<blockquote type="cite">
<blockquote type="cite"> 1073741824 bytes (1.1 GB)
copied, 65.9337 s, 16.3 MB/s
<br>
<br>
Another VM not in ovirt using nfs:
<br>
dd if=/dev/zero of=/root/testfile bs=1G count=1
oflag=direct
<br>
1073741824 bytes (1.1 GB) copied, 27.0079 s,
39.8 MB/s
<br>
<br>
<br>
Is that expected or is there a better way to set it up
to get better
<br>
performance?
<br>
</blockquote>
</blockquote>
Adding Niels for advice.
<br>
<br>
<blockquote type="cite">
<blockquote type="cite">This email, its contents and ....
<br>
</blockquote>
</blockquote>
Please avoid this, this is a public mailing list, everything
you write
<br>
here is public.
<br>
<br>
Nir
<br>
</blockquote>
I'll have to look into how to remove this sig for this mailing
list....
<br>
<br>
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</blockquote>
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<br>
<pre wrap="">_______________________________________________
Users mailing list
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</pre>
</blockquote>
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