RE: DBSPACES and RAID

I would be interested in scenarios (besides multiple disk failures in a short period of time) which will cause RAID 5 to croak and not RAID 1. I do recall a discussion about the data on a disk getting corrupted, and RAID 5 not detecting it. Does RAID 1 do error checking to make sure that the data from both disks are the same? Will P.S. I do like RAID 1 more than RAID 5, but am seldom in a position where I get to make this decision. >===== Original Message From "Glenn Brackenridge" <glenn@gbrack.demon.co.uk> ===== >Not at all. I could detail a few scenarios where RAID5 will croak. It's >architecturally flawed. Check out Art's postings. > >BTW: we have a disaster recovery customer who disclosed to us that the last >5 times they were required to provide site backups it was down to supposedly >safe RAID5 systems just losing their marbles - Oops! I've got no data - as >simple as that. No amount of spare disks were any help. > >However, you are right that RAID5 protection is better than nothing - it >*will* catch straight disk failures. Just don't bet your business on it. > >---------- >In article <87pa71$ge3$1@news.xmission.com>, William Rice ><ricew@operamail.com> wrote: > > > >Seems like a pretty spectacular failure would be required >to get past a RAID 5 implementation with a few hot spares. >A failure that spectacular might take out mirrored disks as well. >And if this person is going from straight disks, no mirroring, to RAID 5, >performance might suffer, but at least there would be a chance of >losing a disk and not losing your system. > >Will ------------------------------------------------------------ This e-mail has been sent to you courtesy of OperaMail, as a free service from Opera Software, makers of the award-winning Web Browser, Opera. Visit us at http://www.opera.com/ or our portal at: http://www.myopera.com/ Your free e-mail account is waiting at: http://www.operamail.com/ ------------------------------------------------------------