Clariion snapshots are useful for point-in-time copies and remote replication. However, they are in no way a solution for full backups, as on a snapshot, the new snapshot volume that is created lives on the same physical disks as the original volume. Sooo, if you have a RAID set failure on a volume, all the snapshots associated with it are gone as well. This differs from third-mirror point-in-time copies like BCVs, where there is an actual extra set of spindles for the RAID group.
The other big downside about snapshots is that if you're using them to back up to tape, all your i/o goes to the same physical disks are your still-active production database. So, the heavy read i/o can negatively impact throughput to production. Also, one note about RAC on EMC - be very careful to match your configuration to one of EMC's certified configs, as they will refuse to support you if things don't match (this includes down to oracle patch rev - 9.2.0.4 is not yet supported on most configs, for example). Thanks, Matt ----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Wednesday, October 08, 2003 9:39 PM > We are implementing Oracle RAC on two Windows nodes, connected to an EMC > SAN. We'll also have a failover sight. > > We are using S.A.M.E. disk configuration, with only one logical volume, > and backups/archivelogs dumping to another volume. > > The SAN is an EMC Clariion CX400. > > I immediately vetoed snapshots, opting for RMAN, but I'm now taking a > second look. > > Does anyone use the snapshot technology as a solution for full backups? > > Thanks, > > Jeff > > > > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: jwiegand > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB ORACLE-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Matthew Zito INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
