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 <mlipc...@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.grundm...@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:mlipc...@redhat.com] >> *Gesendet:* Montag, 23. Jänner 2017 15:32 >> *An:* Grundmann, Christian <christian.grundm...@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.grundm...@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 >> >> >> _______________________________________________ >> Users mailing list >> Users@ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> >> >> > > > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > > -- Thanks, Marina.
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