On 24 January 2014 14:56, Matt Garman [off-list ref] wrote:

On Fri, Jan 24, 2014 at 6:04 AM,  [off-list ref] wrote:

quoted

The reading is not balanced because it does not make sense to do balanced
reads for sequential reading. In RAID-1 the disk sectors are consequitive.
So if you would read one sector from one disk, and the following sector from the other disk,
then the next read from disk 1 would need to skip a full resolvation of the disk,
which may cost something like 8 ms.  So better read contigously from the same disk, and hope
for some other IO request that can use disk 2.

Does that rationale hold for SSDs?
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Note: MD can do RAID10 with 2 devices, right?

Mathias