Re: [ovirt-users] [RFI] oVirt 3.6 Planning

----- Original Message ----- > From: "Nicolas Ecarnot" <nicolas(a)ecarnot.net&gt; > To: "Nir Soffer" <nsoffer(a)redhat.com&gt; > Cc: users(a)ovirt.org, "Federico Simoncelli" <fsimonce(a)redhat.com&gt; > Sent: Saturday, September 13, 2014 9:24:55 PM > Subject: Re: [ovirt-users] [RFI] oVirt 3.6 Planning > > Le 13/09/2014 17:34, Nir Soffer a écrit : >>> For God's sake, please, prevent "secondary" storage domains (anything >>> other than the master, especially iso and export) to completely block >>> the whole thing when being unavailable. >>> To many users suffered from this in the last two years I participate at >>> this mailing list (including me). >> >> I think this is true for ISO and export domains for some time. > > In 3.4 at least, this is still true and is a problem. > At least, if we can get rid of this and just mark these iso and export > domains as unusable, and still do every other non-related operations, > this would be very useful. > >> It will not work for data domains - if you have vms with disks on what you >> call "secondary" data domain, how would you migrate these vms to a host >> that >> cannot see the "secondary" domain? >> >> In 3.6, there will be no "master" domain, so any data domain will be >> important >> as any other data domain. >> >> Maybe what do you like is to have more control on which domains are >> critical, >> and which are not. A domain which you mark as "non-critical", or >> "secondary", >> will not cause the host to become non-operational when the host cannot see >> this domain. >> >> So you would not be able to migrate some vms to a host that cannot see the >> secondary domain, but since *you* marked it as "secondary", it is not a >> problem >> for you. >> >> What do you think? > > This proposition is perfect. > I don't know whether being able to mark some storage domain as more > precious than other will be useful, when their absence won't be a > blocker anymore? The idea is to let you define which storage domains are "required" and which are not, lets call them "optional". If a required storage domain cannot be seen, a host be become non-operational. If an optional storage domain cannot be seen, you will get a warning but the host will function normally. If you try to migrate a vm to a host which cannot see the storage domain used by that vm, the operation will fail. When a "required" storage domain is down, you would be able to change it to "optional", and continue to work with the other domains in degraded mode. Some vms will not able to run, but other vms that do not depend on problem domain will not be affected. I hope that I understood your question correctly. Nir