cro...@cs.rpi.edu (David E. Cross) writes: > I have a drive that is rated at ~16 Meg/second, and indeed it delivers on the > order of 15+ Meg/second. If I use Vinum to create a concatinated device > of 2 such units performance drops to 2.5 Meg/sec. This seems like a > drastic drop in performance. Any ideas what I am doin incorrectly?
You've accidentally striped subdisks on the same drive? ;--) Like Greg Lehey said, you haven't really provided enough details. The minimum info required would be: - Is this read or write performance? Many disks are shipped with write caching disabled, and write performance can be significantly worse than read performance. It shouldn't be quite *that* bad, though, I get better write performance with slower disks, write caching disabled and mirroring (with the default 3.2 vinum - which has debugging compiled in, look at the bss size...). - Are you testing through the filesystem? (How are you testing?) Maybe you're doing a dd test and accessing /dev/vinum/vol/* rather than /dev/vinum/rvol/*... To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
