On Mon, 18 Jun 2007, Brendan Conoboy wrote:
david@xxxxxxx wrote:
in my case it takes 2+ days to resync the array before I can do any
performance testing with it. for some reason it's only doing the rebuild
at ~5M/sec (even though I've increased the min and max rebuild speeds and
a dd to the array seems to be ~44M/sec, even during the rebuild)
With performance like that, it sounds like you're saturating a bus somewhere
along the line. If you're using scsi, for instance, it's very easy for a
long chain of drives to overwhelm a channel. You might also want to consider
some other RAID layouts like 1+0 or 5+0 depending upon your space vs.
reliability needs.
I plan to test the different configurations.
however, if I was saturating the bus with the reconstruct how can I fire
off a dd if=/dev/zero of=/mnt/test and get ~45M/sec whild only slowing the
reconstruct to ~4M/sec?
I'm putting 10x as much data through the bus at that point, it would seem
to proove that it's not the bus that's saturated.
David Lang
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