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Isaac Huang 3d6da72d18 Skip spurious resilver IO on raidz vdev

On a raidz vdev, a block that does not span all child vdevs, excluding
its skip sectors if any, may not be affected by a child vdev outage or
failure. In such cases, the block does not need to be resilvered.
However, current resilver algorithm simply resilvers all blocks on a
degraded raidz vdev. Such spurious IO is not only wasteful, but also
adds the risk of overwriting good data.

This patch eliminates such spurious IOs.

Reviewed-by: Gvozden Neskovic <neskovic@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Isaac Huang <he.huang@intel.com>
Closes #5316

2017-05-12 17:28:03 -07:00

linux

Linux 4.12 compat: CURRENT_TIME removed

2017-05-10 09:30:48 -07:00

sys

Skip spurious resilver IO on raidz vdev

2017-05-12 17:28:03 -07:00

libnvpair.h

Support custom build directories and move includes

2010-09-08 12:38:56 -07:00

libuutil_common.h

Support custom build directories and move includes