On Mon Jan 31, 2011 at 04:59:28PM -0500, Phillip Susi wrote:

On 1/31/2011 3:23 PM, Stan Hoeppner wrote:

quoted

This is absolutely not correct.  In a 10 disk RAID 10 array, exactly 5 disks can
fail, as long as no two are in the same mirror pair, and the array will continue
to function, with little or no performance degradation.

That is a raid 0+1, not raid10.

No, it's RAID 10 or RAID 1+0. RAID 0+1 would be 2 mirrored pairs of
5-disk RAID 0 arrays, in which case you could only lose 5 disks if
they're all from the same RAID 0 array.  With RAID 10 or RAID 1+0 (in
the case of a 10-disk n2 setup, the physical layout should be exactly
the same) then the restriction is, as stated, that no two are "mirrored"
(whether that's a separate RAID 1 mirror or just that the two are
defined by the RAID 10 layout to contain the same data is irrelevant).

quoted

Where are you getting your information?  Pretty much everything you stated is
wrong...

The mdadm man page.

The md man page would be better for information on the physical layouts,
but I don't see anything on there to support what you're saying here.

Cheers,
    Robin
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