On 2/02/2010, at 11:31 AM, Gordan Bobic wrote: > Abraham Alawi wrote: >> On 2/02/2010, at 5:21 AM, Gordan Bobic wrote: >>> AlannY wrote: >>>> On Mon, Feb 01, 2010 at 03:34:18PM +0000, Christine Caulfield wrote: >>>>> Is it really two different devices ? If so then clvmd will not work. >>>>> It needs the same view of storage on all systems. Not necessarily >>>>> the same names, but definitely the same actual storage. >>>> So, should I use DRBD with clvm for data mirroring on both nodes? >>> You could, indeed, use DRBD. Or you could cross-export the block devices with iSCSI (or ATAoE) and have them connected to all the nodes that way. I guess it depends on whether you prefer to use DRBD or CLVM. My preference is for DRBD, but don't let that bias your decision. :) >>> >>> Gordan >>> >> I reckon GNBD will be a better solution in your case, DRBD is more >> suitable for non-cluster file systems (e.g. ext3, xfs .. ) in case >> of active-passive > > DRBD is specifically designed to also work in active-active mode. I've been running shared root GFS clusters on DRBD for years. DRBD is singularly _THE_ best solution for network RAID1, _especially_ in active-active mode with a clustered file system on top. It also handles resyncing after outages much more gracefully and transparently than other similar solutions. > > Gordan > Yes, it does work in active-active but DRBD people themselves don't recommend running it in production active-active under cluster file system, I quote from their website: "DRBD's primary-primary mode with a shared disk file system (GFS, OCFS2). These systems are very sensitive to failures of the replication network. Currently we cannot generally recommend this for production use." http://www.drbd.org/home/mirroring/ In terms of production solution I reckon GNBD is designed more specifically for that purpose. I'm glad to know that DRBD is running well for you under GFS, honestly I have never tried this setup, it's worthwhile trying though. Cheers, -- Abraham '''''''''''''''''''''''''''''''''''''''''''''''''''''' Abraham Alawi Unix/Linux Systems Administrator Science IT University of Auckland e: a.alawi@xxxxxxxxxxxxxx p: +64-9-373 7599, ext#: 87572 '''''''''''''''''''''''''''''''''''''''''''''''''''''' -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
