On Friday 09 March 2012 16:55:36 Jeff Sturm wrote: > Sure. As long as you don't try to make use of any LVM features that > require metadata consistency (mirroring, snapshots, online resizing, etc.) > you can get by using LVM without clustering. Yes, particulary using the (relatively new) options of lvchange / vgchange : --refresh If any logical volume in the volume group is active, reload its metadata. This is not necessary in normal operation, but may be use- ful if something has gone wrong or if you're doing clustering manually without a clustered lock manager. > > -Jeff > > From: linux-cluster-bounces@xxxxxxxxxx > [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Charles Riley Sent: > Friday, March 09, 2012 8:56 AM > To: linux clustering > Subject: Re: Clustered LVM for storage > > > We're talking 36TB of storage here.. I've never had much success > partitioning an array of that size (and actually being able to use all of > the space) without lvm. But I might give that a try. > > Continuing along this line of thought: > If I stop access to the array from all of the servers before I make any > changes, I could probably even make use of lvm without clustering. > > Charles > > > On Thu, Mar 8, 2012 at 5:59 PM, Jeff Sturm > <jeff.sturm@xxxxxxxxxx<mailto:jeff.sturm@xxxxxxxxxx>> wrote: With aoe you > can use old-fashioned disk partitioning. Just run "parted" (or whatever > partitioning tool you choose) and allocate storage for partitions as you > see fit. > > The benefits of doing this are: Easier/simpler to setup than cluster > suite, and you can still use all the spindles from your aoe target (for > example by creating a large RAID-10 array across all disks). > > The downside of partitions is they aren't easy to change. You can add them > safely while the storage array is in use, but each host needs to reload > the partition table when you're done with changes before the new storage > can be used, and that may not happen until you rmmod/modprobe the aoe > driver, which you can't do while any partitions are in use, e.g. on > mounted file systems. And resizing partitions is tricky because they are > allocated on consecutive sectors. > > So if you want the flexibility of adding/removing/modifying volumes at any > time, it may be worth the trouble to get Cluster Suite running so you can > use CLVM. If you just want to carve it up once and forget about it, > partitioning the array will be the fastest. > > -Jeff > > From: > linux-cluster-bounces@xxxxxxxxxx<mailto:linux-cluster-bounces@xxxxxxxxxx> > [mailto:linux-cluster-bounces@xxxxxxxxxx<mailto:linux-cluster-bounces@redh > at.com>] On Behalf Of Charles Riley Sent: Thursday, March 08, 2012 1:59 PM > To: linux cluster > Subject: Clustered LVM for storage > > Greetings, > > I have an aoe device with a lot of storage in it that I would like to share > among four rhel 4 servers. Each of the servers will mount it's own > storage, no data is shared between them. e.g the servers won't be > mounting the same volumes. > > I could create four different raid groups on the aoe device and present a > different one to each server, but that would waste space. What I'd rather > do is create one big raid group and use clustered lvm to divvy the space > between servers. > > Is it possible? Would it be enough to run just the clustered lvm daemon, > or would I need to install all of the cluster suite? Are there > other/better options? > > Thanks! > > Charles > > > > > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx<mailto:Linux-cluster@xxxxxxxxxx> > https://www.redhat.com/mailman/listinfo/linux-cluster > > > > -- > Charles Riley | eRAD<http://www.erad.com> | Director of Technical Solutions > | O: 864.640.8648 C: 864.881.1331 -- Xavier Montagutelli http://twitter.com/#!/XMontagutelli Service Commun Informatique - Universite de Limoges 123, avenue Albert Thomas - 87060 Limoges cedex Tel : +33 (0)5 55 45 77 20 / Fax : +33 (0)5 55 45 75 95 -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
