[ovirt-users] Storage Domain sizing

[Marina Kalinin]

Hi Christian,

Indeed, lvm adds some overhead when scanning the domains, so there is a
limit around 300 lvs per domain, where each snapshot of each disk counts as
a new lv.
On the other hand, having too many domains can also affect on overall
performance required for oVirt to manage all of them.
I suggest, if you have 7 now and they work fine - try sticking to them.
Or, reduce to 3 or 5 and monitor your performance.
Also, afaik, there should be a lot of performance improvements coming in
the new release, so try 4.1 and see.
I hope this helps.

Marina.

On Mon, Jan 23, 2017 at 9:53 AM, Maor Lipchuk <mlipchuk at redhat.com> wrote:

> I know that there is a monitoring process which monitors each Storage
> Domain, so I guess that if you will have multiple storage domains this will
> make the monitor runs every time multiple times, but I think that the
> affect is insignificant on the Host or the Storage Domain.
>
> You should also consider the limitation of logical volumes in a volume
> group,
> IINM LVM has a default limit of 255 volumes (I'm not sure how it behaves
> regarding efficiency if you use more volumes)
> oVirt uses LV also for snapshots so with one storage domain you might get
> to this limit pretty quick
>
> On Mon, Jan 23, 2017 at 4:35 PM, Grundmann, Christian <
> Christian.Grundmann at fabasoft.com> wrote:
>
>> Hi,
>>
>> thx for you input
>>
>> both aren’t problems for me, all domains are from the same storage and so
>> can’t be maintained independently.
>>
>>
>>
>> Are there performance problems with only one Domain (like waiting for
>> locks etc.) which I don’t have that much with multiple?
>>
>>
>>
>> Thx Christian
>>
>>
>>
>>
>>
>> *Von:* Maor Lipchuk [mailto:mlipchuk at redhat.com]
>> *Gesendet:* Montag, 23. Jänner 2017 15:32
>> *An:* Grundmann, Christian <Christian.Grundmann at fabasoft.com>
>> *Cc:* users at ovirt.org
>> *Betreff:* Re: [ovirt-users] Storage Domain sizing
>>
>>
>>
>> There are many factors that can be discussed on this issue,
>>
>> two things that pop up on my mind are that many storage domains will make
>> your Data Center be more robust and flexible, since you can maintain part
>> of the storage domains which could help with upgrading your storage server
>> in the future or fixing issues that might occur in your storage, without
>> moving your Data Center to a non operational state.
>>
>>
>>
>> One storage domain is preferrable if you want to use large disks with
>> your VMs that small storage domains does not have the capacity to do so
>>
>>
>>
>> Regards,
>>
>> Maor
>>
>>
>>
>> On Mon, Jan 23, 2017 at 9:52 AM, Grundmann, Christian <
>> Christian.Grundmann at fabasoft.com> wrote:
>>
>> Hi,
>>
>> Ii am about to migrate to a new storage.
>>
>> Whats the best practice in sizing?
>>
>> 1 big Storage Domain or multiple smaller ones?
>>
>>
>>
>> My current Setup:
>>
>> 11 Hosts
>>
>> 7 FC Storage Domains 1 TB each
>>
>>
>>
>> Can anyone tell me the pro and cons of 1 vs. many?
>>
>>
>>
>>
>>
>> Thx Christian
>>
>>
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>>
>>
>>
>
>
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-- 
Thanks,
Marina.
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