Re: RAID and continuous backup

Crash wrote: > > Is there any reason to run continuous backup on a system with RAID? We're > in the midst of looking for a new system and want to know how many tape > drives to purchase. The only reason I can think of off hand is if the > whole RAID system crashes but I would like any info for or against running > both RAID and continuous backup. > I know there are many Informix experts who oppose RAID-5 with Informix, but we are running RAID-5 (and its variation) on almost all our Solaris Sparcs. We still don't see performance problems with RAID-5. Maybe it is because we are using Sun's StorageArray and EMC's Symmetix. Sun's StorageArray can run 25MByte in one direction and it supports both directions simultaneously. EMC's Symmetrix has one terabyte hard disk but it has 3.5 GByte cache. We do use continuous backup for Sparc 2000E with EMC Symmetrix. Besides, we also have optical jukeboxes and tape jukeboxes to backup a major portion of our database. Our client is willing to pay the high price to back up the system three times. I guess it really depends on your requirements. Chao