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My apologies, I'm showing how much of a noob I am.<br>
Ignore last direct to gluster numbers, as that wasn't really
glusterfs.<br>
<br>
<br>
[root@ovirt2 test ~]# mount -t glusterfs
ovirt2-ks.test.j2noc.com:/gv1 /mnt/tmp/<br>
[root@ovirt2 test ~]# time dd if=/dev/zero of=/mnt/tmp/testfile2
bs=1M count=1000 oflag=direct<br>
1048576000 bytes (1.0 GB) copied, 65.8596 s, 15.9 MB/s<br>
<br>
That's more how I expected, it is pointing to glusterfs performance.<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 02/11/2016 03:27 PM, Bill James
wrote:<br>
</div>
<blockquote cite="mid:56BD18D7.8080909@j2.com" type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
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 moz-do-not-send="true" 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 moz-do-not-send="true"
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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