Single drives still aren't fast enough for enterprise work. We've been over this...the horse is dead, buried, he's been exhumed and is now being beaten again within an inch of his death. RAID with backup on/offsite is still cheaper then putting together a cluster for some mid range customers. I've never said RAID should be used for storage...and of course always backup.
This from my RAID 0 fully backed up pc. On Sat, Oct 25, 2008 at 10:16 AM, Tom Piwowar <[EMAIL PROTECTED]> wrote: > >Never said RAID was best, just that it has it's place. Tom's argument > >previously was that because of HD's high MTBF RAID was useless, this new > >article that came up said RAID was useless because of low MTBF. > > I think you should reread the "2009" article more carefully. That article > was not about MTBFs. It was about the probability of errors vs the number > of bytes on the drive. As the number of bytes increases the probability > of an error increases. The author said that that probability of 1 error > would soon approach 100%. Under those condtions RAID would fail to > rebuild a bad drive. > > Hence a RAID set would be no more secure than a single drive and it would > be less reliable because the probability of something going wrong on a > RAID set is higher than the probability of a single drive failing. > > Probability lesson (simplified but accurate): > 1) The non-RAID bet: I flip a coin. Heads you lose. > 2) The RAID bet: I flip 7 coins. If any one is heads, you lose. > > Do you want to take bet 1 or 2? > > > ************************************************************************* > ** List info, subscription management, list rules, archives, privacy ** > ** policy, calmness, a member map, and more at http://www.cguys.org/ ** > ************************************************************************* > -- Make sure you support your local CarbonONset programs! ************************************************************************* ** List info, subscription management, list rules, archives, privacy ** ** policy, calmness, a member map, and more at http://www.cguys.org/ ** *************************************************************************
