2120S poor performance
From: Bill Anderson (anderson_at_wks.uts.ohio-state.edu)
Date: 12/08/04
- Previous message: Mike Jakubik: "Re: Memory issues:-("
- Next in thread: Mike Horwath: "Re: 2120S poor performance"
- Reply: Mike Horwath: "Re: 2120S poor performance"
- Reply: Jon Noack: "Re: 2120S poor performance"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Date: Wed, 8 Dec 2004 11:51:21 -0500 (EST) To: <freebsd-performance@freebsd.org>
I've got a 3x72g RAID5 array with U320 disks on an Adaptec 2120S
controller under Freebsd 4.10. I'm getting about 25MB/s for sequential
reads/writes (e.g. dd if=/dev/aacd0s1b of=/dev/null bs=32k). I've
turned on write caching for the container (container set cache
/write_cache_enable) and turned off the read caching, per previous posts
to this list. I'm going to try setting hw.aac.iosize_max to 96k tonight
to see if that helps. I'm currently using an IDE disk that gets about
45MB/s, so I can hardly consider it an "upgrade" to switch to a 25MB/s
U320 SCSI system. :/
I've also read that the 2120S is slow because of its design. I'm trying
to figure out whether the performance can be increased significantly (I
saw a posting of a linux user getting 37.5MB/s, which although still slow
might be acceptable), or if I'm better off getting a new card. I'm
thinking the latter is the case based on previous postings, but since it
will probably be quite expensive to replace it, I wanted to get some more
data.
What performance should I be expecting from a decent U320 RAID5
controller?
Has anyone gotten a 2120S to perform above 30Mb/s in FreeBSD?
What's the cheapest controller that still gives reasonable performance?
(If you could give a couple different ones, with their associated
performance (under FreeBSD), or tell me where to find such information,
that would be great)
Thanks,
Bill
_______________________________________________
freebsd-performance@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-performance
To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org"
- Previous message: Mike Jakubik: "Re: Memory issues:-("
- Next in thread: Mike Horwath: "Re: 2120S poor performance"
- Reply: Mike Horwath: "Re: 2120S poor performance"
- Reply: Jon Noack: "Re: 2120S poor performance"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
|
