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