[Gluster-users] [ovirt-users] ovirt glusterfs performance
Bill James
bill.james at j2.com
Thu Feb 11 23:27:19 UTC 2016
don't know if it helps, but I ran a few more tests, all from the same
hardware node.
The VM:
[root at 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 at 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 at 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.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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