[ovirt-users] ovirt glusterfs performance

[Nir Soffer]

On Thu, Feb 11, 2016 at 8:27 PM, Bill James <bill.james at 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 at 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 <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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