On 04/28/10 10:01 AM, Bob Friesenhahn wrote:
On Wed, 28 Apr 2010, Ian Collins wrote:
On 04/28/10 03:17 AM, Roy Sigurd Karlsbakk wrote:
Hi all
I have a test system with snv134 and 8x2TB drives in RAIDz2 and
currently no Zil or L2ARC. I noticed the I/O speed to NFS shares on
the testpool drops to something hardly usable while scrubbing the pool.
Is that small random or block I/O?
I've found latency to be the killer rather than throughput, at lest
when receiving snapshots. In normal operation, receiving an empty
snapshot is a sub-second operation. While resilvering, at can take
up to 30 seconds. The write speed on bigger snapshots is still
acceptable.
zfs scrub != zfs send
Where did I say it did? I didn't even mention zfs send.
My observation concerned poor performance (latency) during a scrub/resilver.
--
Ian.
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