On Sun, 11 Aug 2002, Rick Moen wrote: > Quoting Ian C. Sison ([EMAIL PROTECTED]): > > > Tape backup is unnecassary if you have RAID1 and you regularly switch your > > mirror disk. > > It's a super-effective way of doing a limited number of generations of > backups. (Small disadvantage is that your array is vulnerable during > the rebuild cycle, but only new data would be at risk.)
True. I tried to build a 3-disk raid-1 with 3ware before, but either i didn't know how to do it correctly or the 3ware controler wouldn't support 3 or more disk raid 1. Another IDE based RAID box is the Arena series, and this one has 3 trays, and you can RAID 1 all three, eliminating the vulnerability during the rebuild process. > > One drawback might be relative expense. If you're _serious_ about > backup, and have a proper rotational backup schedule in mind, your cost > of "media" (mirror disks used as backups) might be too high compared to > more-conventional alternatives. If you're contemplating only two or > three generations of snapshots, then you're not serious. True, and again, it all boils down to how much you value your data. > > Don't forget, too, that you'll need to be careful about the relative > fragility of hard drives. THe advantage of hard drives, is that you know (through regular surface scans and controller diags) if it is about to fail. Something that's hard to do with tape media without wearing out your head or your tapes via regular test reads. _ Philippine Linux Users Group. Web site and archives at http://plug.linux.org.ph To leave: send "unsubscribe" in the body to [EMAIL PROTECTED] To subscribe to the Linux Newbies' List: send "subscribe" in the body to [EMAIL PROTECTED]
