[ovirt-users] ovirt glusterfs performance

[Nir Soffer]

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

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.

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Please avoid this, this is a public mailing list, everything you write
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Nir