[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] High Number of VMs
I forgot to include the list… Am 10.09.2011 um 09:18 schrieb James Harper: >> Am 10.09.2011 um 02:23 schrieb "James Harper" > <james.harper@xxxxxxxxxxxxxxxx>: >> >>>> You don't actually need cLVM to do this! All the >>>> cluster infra does (for its nasty administrative overhead) is keep > the >>>> LVM metadata (not your actual data) consistent through cluster-wide >>>> locks. You can manage yourself by, for example, making changes on > one >>>> node and refreshing the other nodes with things like 'vgscan -ay'. > I >>>> typically allocate LUNs 500GB at a time. You can invent means of >>>> keeping things consistent that work for your environment, just test > them >>>> first. >>> >>> Another thing cLVM does is enforce the restriction on snapshots. > Without >> cLVM you could create a snapshot on one node and completely trash the > volume. >> I believe the CoW action of LVM snapshots involves a metadata update > so you >> can't use it in a clustered environment. This is why I use LVM on the > SAN >> rather than on the DomU. >>> >> That is no longer true. CLVM supports clustered snapshots. I use it > already. >> But there is another limitation. You have to open the LV in exclusive > mode >> (lvchange -aey). It is enough to compile CLVM with openais and you > have your >> Cluster running in minutes. >> > > That's great news! I was checking the web every so often to see if this > feature had been added yet but hadn't recently. > If you use Debian, I can send a link where you can download my packages. > Thanks > > James Christian _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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