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Ok I will concede, it probably is higher. Yes i did exclude power surges, but a critical server should have on-line power protection anyway which should prevent MOST power surges. Anyway there is never 100% certainty of anything, thats why we also run daily tape backups, that are rotated, kept of site etc, and less regular CD archiving all to increase our chance that if the worst happens we have the maximum possible possible chance of recovery and in the end thats what is all about anyway. You can never say you are 100% safe! And as i said being saved twice by 2 disk mirror software raid is good enough for me! Best Regards Robin PS i wonder what the actual probability is for a double disk disaster? I suspose you would have to factor disk life, mean time between failures and the actual normal distribution of failure for a given disk which i suspect the manufactures would not freely give away. On Saturday 21 Jun 2003 2:01 pm, Kai Hendry wrote: > On Wed, Oct 30, 2002 at 11:12:00 +0000, Robin Cornelius wrote: > > this is very unlikely due to the probability of failure. Excluding > > external power surges and physical attack there is probably greater that > > a 99.9% chance that the drives will fail at a different time. > > Oh clever that you conveniently excluded power surges. Anyway the chance > two exactly the same HDs will fail at the same time is higher that your > pulled out the air figure of 0.01%. > > Be logical! > -Kai > > -- > The Mailing List for the Devon & Cornwall LUG > Mail majordomo@xxxxxxxxxxxx with "unsubscribe list" in the > message body to unsubscribe. -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe.