Hi All; Accessing the same data(Raid Group) from different controllers does slow down the system considerebly. All modern controllers will demand the administrator to choose the primary controler for Raid Groups. Two controller accesing the same data will require drive interface switching between ports, controllers will not be able to optimize the head movement, caching will suffer due to dublicate records on both controllers, a lot of data transfers between each controller...
Only very few disk systems support multi controler access to same data and when you read their best practice document you will notice that this is not recommended. Best regards Mertol Mertol Ozyoney Storage Practice - Sales Manager Sun Microsystems, TR Istanbul TR Phone +902123352200 Mobile +905339310752 Fax +902123352222 Email [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mattias Pantzare Sent: Friday, November 14, 2008 11:48 PM To: David Pacheco Cc: zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] continuous replication > I think you're confusing our clustering feature with the remote > replication feature. With active-active clustering, you have two closely > linked head nodes serving files from different zpools using JBODs > connected to both head nodes. When one fails, the other imports the > failed node's pool and can then serve those files. With remote > replication, one appliance sends filesystems and volumes across the > network to an otherwise separate appliance. Neither of these is > performing synchronous data replication, though. That is _not_ active-active, that is active-passive. If you have a active-active system I can access the same data via both controllers at the same time. I can't if it works like you just described. You can't call it active-active just because different volumes are controlled by different controllers. Most active-passive RAID controllers can do that. The data sheet talks about active-active clusters, how does that work? _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
