On Friday 30 September 2011 06:20:42 Tim Connors wrote:
> Worst case, if you lose one disk, then rebuild, and during rebuild,
> suffer the likely consequence of losing another disk when rebuilding
> raid6, you still have a valid array.
> Worse case, fairly likely occurence with raid10, lose that second disk and
> lose all your data.
> Care for your data ==> don't use raid10.

Thats stupid.

Raid5: Loose one disk during recovery -> you are screwed.
Raid6: Loose two disks during recovery -> you are screwed.

Given that fact that most people use the same disks from the same vendor and 
the same production line (with consecutive serial numbers), the chances to 
have several disks fail at the same time is very high.

For Raid1 and Raid10: Use two lots of disks from different vendors or at least 
buy them half a year apart. And pair so that always two different kinds are 
toghether. Then one batch can collectivly jump the cliff while all your data is 
still intact.

And don't argue that disks with consecutive serial numbers won't break 
together: From the three disk failures I encountered where I had a second of 
the same type, that second broke shortly after.

Have fun,

Arnold

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