On 12/20/2010 11:36 AM, Alexander Lesle wrote:
Hello All
I read this thread Resilver/scrub times? for a few minutes
and I have recognize that I dont know the different between
Resilvering and Scrubing. Shame on me. :-(
I dont find some declarations in the man-pages and I know the command
to start scrubing "zpool scrub tank"
but what is the command to start resilver and what is the different?
Resilvering is reconstruction of a failed drive (or portion of that
drive). It involves walking the metadata tree of the pool, to see if
all blocks are stored properly on the correct devices; if not, then a
write is issued to the device which is missing the correct block. It
does NOT deal with checksums of the individual blocks.
Scrubbing is error-detection. Scrubbing looks for blocks whose metadata
checksums do not match the checksum returned by the data held in the
block. If the data doesn't match, ONLY then does a new block get written
out.
Scrubbing is independent of media failure (that is, it isn't triggered
by the failure of block or whole device) - it is performed by a userland
action.
Resilvering is dependent on device failure (whether permanent, or
temporary) - it is triggered by a system condition.
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
Timezone: US/Pacific (GMT-0800)
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