Re: limits on raid

david@lang.hm 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.

-- 
Brendan Conoboy / Red Hat, Inc. / blc@redhat.com