[Users] Storage Performance Issue !

[Sven Kieske]

Just as a quick shot:

You really may want to check which IO scheduler runs inside the
vm. you probably want deadline or noop instead of CFQ, which
can have a huge performance impact inside the vms.

you can check the default scheduler with:
dmesg | grep scheduler
you should get an output similar to this:
[    0.841989] io scheduler noop registered
[    0.841990] io scheduler deadline registered (default)
[    0.842028] io scheduler cfq registered

HTH

Am 19.02.2014 12:15, schrieb Itamar Heim:
> On 02/19/2014 10:48 AM, Dafna Ron wrote:
>> Actually, I meant how is the network configured rhevm side?
>> are all vm's writing on rhevm interface?
>> Itamar, Should local storage be used this way in rhevm?
> 
> I see no issue using ovirt to manage standalone hosts with their local
> storage.
> network isn't a factor in this case.
> how many spindles on the host? what is the load on the disks you see at
> host level? which vdisk type are you using (ide/virtio-block/virtio-scsi)?
> 
>>
>> On 02/19/2014 03:56 AM, Vishvendra Singh Chauhan wrote:
>>> Hi,
>>>
>>> My network is 1 Gigabit. And i am using my each node in a separate
>>> cluster/DC.
>>>
>>> And memory and processor uses are very low. Means when i run 30 vms
>>> then it's processor uses is 45% and memory uses is 35% around.
>>>
>>>
>>> On Tue, Feb 18, 2014 at 2:14 PM, Dafna Ron <dron at redhat.com
>>> <mailto:dron at redhat.com>> wrote:
>>>
>>>     what is the network configuration? are you using each host with
>>>     it's own cluster/DC as a local storage host?
>>>     how many hosts are we talking about? what is the memory/cpu
>>>     consumption on the hosts?
>>>
>>>
>>>
>>>     On 02/18/2014 01:18 AM, Vishvendra Singh Chauhan wrote:
>>>
>>>         Thanks Dafna,
>>>
>>>         I am Using Dell server Just as node, My manager is running on
>>>         other machine. On each node we have 40 vm's running. and all
>>>         most vm's has RHEL6 os. Now the problem about performance of
>>>         vm's, when client is writing the data in vm, they are
>>>         reporting, that they have  very slow speed to write the data.
>>>
>>>         I also feel slow performance at writing speed in the vm's, So
>>>         now please suggest, is any way to improve the writing speed in
>>>         virtual machine's ?.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>         On Mon, Feb 17, 2014 at 2:40 PM, Dafna Ron <dron at redhat.com
>>>         <mailto:dron at redhat.com> <mailto:dron at redhat.com
>>>         <mailto:dron at redhat.com>>> wrote:
>>>
>>>             please give more information.
>>>             what do you mean by storage performance?
>>>             how many vm's are you running?
>>>             are you using the Dell as just a host or is engine also
>>>         installed
>>>             on it?
>>>
>>>
>>>             On 02/17/2014 03:26 AM, Vishvendra Singh Chauhan wrote:
>>>
>>>                 Hello Group,
>>>
>>>                 Please help me out in storage issue in ovirt.
>>>
>>>
>>>                 I am using Dell PowerEdge XD 720 servers, as node in
>>>         Ovirt.
>>>                 Every node has 24TB storage space, so i am using all
>>> this
>>>                 space as the local storage in that.. But still i am
>>>         facing the
>>>                 problem in storgae performance. My guests os are very
>>>         slow to
>>>                 write the data.
>>>
>>>
>>>                 So please give me, some tips using them i can increase
>>> the
>>>                 performance in storage.
>>>
>>>
>>>
>>>                 --         /*Thanks and Regards.*/
>>>                 /*Vishvendra Singh Chauhan*/
>>>
>>>
>>>                 _______________________________________________
>>>                 Users mailing list
>>>         Users at ovirt.org <mailto:Users at ovirt.org>
>>>         <mailto:Users at ovirt.org <mailto:Users at ovirt.org>>
>>>
>>>         http://lists.ovirt.org/mailman/listinfo/users
>>>
>>>
>>>
>>>             --     Dafna Ron
>>>
>>>
>>>
>>>
>>>         --         /*Thanks and Regards.*/
>>>         /*Vishvendra Singh Chauhan*/
>>>         /*(*//*RHC{SA,E,SS,VA}CC{NA,NP})*/
>>>         /*+91-9711460593
>>>         */
>>>
>>>         http://linux-links.blogspot.in/
>>>         God First Work Hard Success is Sure...
>>>
>>>
>>>
>>>     --     Dafna Ron
>>>
>>>
>>>
>>>
>>> -- 
>>> /*Thanks and Regards.*/
>>> /*Vishvendra Singh Chauhan*/
>>> /*(*//*RHC{SA,E,SS,VA}CC{NA,NP})*/
>>> /*+91-9711460593
>>> */
>>> http://linux-links.blogspot.in/
>>> God First Work Hard Success is Sure...
>>
>>
> 
> 
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> 
> 
> 

-- 
Mit freundlichen Grüßen / Regards

Sven Kieske

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