tree 8e45d1c6d9b4020099fd36781065bf8b8fdb76e4
parent 4f54b0e9485644a3c5fca2ae43bcbe7376825747
author Bernd Schubert <bs@q-leap.de> 1211573078 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1211648170 -0700

md: allow parallel resync of md-devices.

In some configurations, a raid6 resync can be limited by CPU speed
(Calculating P and Q and moving data) rather than by device speed.  In
these cases there is nothing to be gained byt serialising resync of arrays
that share a device, and doing the resync in parallel can provide benefit.
 So add a sysfs tunable to flag an array as being allowed to resync in
parallel with other arrays that use (a different part of) the same device.

Signed-off-by: Bernd Schubert <bs@q-leap.de>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>