My apologies, I'm showing how much of a noob I am.
Ignore last direct to gluster numbers, as that wasn't really glusterfs.
[root@ovirt2 test ~]# mount -t glusterfs ovirt2-ks.test.j2noc.com:/gv1
/mnt/tmp/
[root@ovirt2 test ~]# time dd if=/dev/zero of=/mnt/tmp/testfile2 bs=1M
count=1000 oflag=direct
1048576000 bytes (1.0 GB) copied, 65.8596 s, 15.9 MB/s
That's more how I expected, it is pointing to glusterfs performance.
On 02/11/2016 03:27 PM, Bill James wrote:
don't know if it helps, but I ran a few more tests, all from the same
hardware node.
The VM:
[root@billjov1 ~]# time dd if=/dev/zero of=/root/testfile bs=1M
count=1000 oflag=direct
1048576000 bytes (1.0 GB) copied, 62.5535 s, 16.8 MB/s
Writing directly to gluster volume:
[root@ovirt2 test ~]# time dd if=/dev/zero
of=/gluster-store/brick1/gv1/testfile bs=1M count=1000 oflag=direct
1048576000 bytes (1.0 GB) copied, 9.92048 s, 106 MB/s
Writing to NFS volume:
[root@ovirt2 test ~]# time dd if=/dev/zero of=/mnt/storage/qa/testfile
bs=1M count=1000 oflag=direct
1048576000 bytes (1.0 GB) copied, 10.5776 s, 99.1 MB/s
NFS & Gluster are using the same interface. Tests were not run at same
time.
This would suggest my problem isn't glusterfs, but the VM performance.
On 02/11/2016 03:13 PM, Bill James wrote:
xml attached.
On 02/11/2016 12:28 PM, Nir Soffer wrote:
On Thu, Feb 11, 2016 at 8:27 PM, Bill James <bill.ja...@j2.com> wrote:
thank you for the reply.
We setup gluster using the names associated with NIC 2 IP.
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
That's NIC 2's IP.
Using 'iftop -i eno2 -L 5 -t' :
dd if=/dev/zero of=/root/testfile bs=1M count=1000 oflag=direct
1048576000 bytes (1.0 GB) copied, 68.0714 s, 15.4 MB/s
Can you share the xml of this vm? You can find it in vdsm log,
at the time you start the vm.
Or you can do (on the host):
# virsh
virsh # list
(username: vdsm@ovirt password: shibboleth)
virsh # dumpxml vm-id
Peak rate (sent/received/total): 281Mb 5.36Mb
282Mb
Cumulative (sent/received/total): 1.96GB 14.6MB
1.97GB
gluster volume info gv1:
Options Reconfigured:
performance.write-behind-window-size: 4MB
performance.readdir-ahead: on
performance.cache-size: 1GB
performance.write-behind: off
performance.write-behind: off didn't help.
Neither did any other changes I've tried.
There is no VM traffic on this VM right now except my test.
On 02/10/2016 11:55 PM, Nir Soffer wrote:
On Thu, Feb 11, 2016 at 2:42 AM, Ravishankar N
<ravishan...@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 (1GbE)
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.
This email, its contents and ....
Please avoid this, this is a public mailing list, everything you
write
here is public.
Nir
I'll have to look into how to remove this sig for this mailing
list....
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