Robert Milkowski wrote:
Hello Mario,
Wednesday, May 9, 2007, 5:56:18 PM, you wrote:
MG> I've read that it's supposed to go at full speed, i.e. as fast as
MG> possible. I'm doing a disk replace and what zpool reports kind of
MG> surprises me. The resilver goes on at 1.6MB/s. Did resilvering get
MG> throttled at some point between the builds, or is my ATA controller having
bigger issues?
Lot of small files perhaps? What kind of protection have you used?
Good question. Remember that resilvering is done in time order and from
the top-level metadata down, not by sequentially blasting bits. Jeff
Bonwick describes this as top-down resilvering.
http://blogs.sun.com/bonwick/entry/smokin_mirrors
From a MTTR and performance perspective this means that ZFS recovery time
is a function of the amount of space used, where it is located (!), and the
validity of the surviving or regenerated data. The big win is the amount of
space used, as most file systems are not full.
-- richard
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