On 04/10/2011 03:50:59 PM, Mark Knecht wrote: > On Sun, Apr 10, 2011 at 12:50 AM, Peter Humphrey > <pe...@humphrey.ukfsn.org> wrote: > .... > I read about again and again is a RAID user who loses 1 drive and > then, while in the process of fixing the RAID, loses a second drive. > Most of us (myself included) buy identical drives all at the same > time > from the same vendor. This means all the drives were likely from the > same manufacturing batch and, if they are drives that will fail at > all > then the group will likely experience multiple drive failures. The
Life time is always a statistical statement and therefore I consider it very unlikely that two or more of them fail at the same time - perhaps with one (big) exception. A given brand/model might be very sensitive to power failures or excess voltages, and in that case many of them could fail after a power failure - or excess voltage. Since my data is not rapidly changing, I backup my data several times a day onto a spare disk which I spin down in between (using hdparm). At least I hope to increase the life time of that backup disk this way. Helmut.
