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@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@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@redhat.com]
Gesendet: Montag, 23. Jänner 2017 15:32
An: Grundmann, Christian <Christian.Grundmann@fabasoft.com>
Cc: users@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@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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--
Thanks,
Marina.