[ovirt-users] ovirt glusterfs performance

[Bill James]

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

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 <ravishankar at 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 at 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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