On Nov 30, 2006, at 11:40 AM, Derrick MacPherson wrote:
That seems like a pretty crazy drop in performance, more than one would expect. The machine is busy but not busy enough to warrant this.. Imo.. Is there a way to test to confirm?
Using dd is a trivial benchmark, and not especially precise but good enough to give rough answers; otherwise, there are lots of I/O benchmarks in ports like iozone or even "diskinfo -t". Try using different block sizes while reading and writing with dd, and you'll probably find some useful info.
While it is likely that you can adjust the RAID-5 stripe size, change the write-caching from write-thru to write-back (if your RAID has a battery, anyway, otherwise this is dangerous), etc, using a 3-disk RAID-5 volume is just not a great idea-- RAID-5 is happier with more drives than the minimum of 3 to get better parallelism and reduce the overhead for parity info.
-- -Chuck _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
