Date: Wed, 12 May 2004 21:04:29 +0200 From: Jens Schweikhardt <schweikh@schweikhardt.net> To: Scott Long <scottl@freebsd.org> Cc: freebsd-scsi@freebsd.org Subject: Re: 2120S Stripe - abysmal performance Message-ID: <20040512190429.GA1315@schweikhardt.net> In-Reply-To: <20040512183231.GB3137@schweikhardt.net> References: <FE045D4D9F7AED4CBFF1B3B813C85337051D8C0D@mail.sandvine.com> <40A26356.409@freebsd.org> <20040512183231.GB3137@schweikhardt.net>
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On Wed, May 12, 2004 at 08:32:31PM +0200, Jens Schweikhardt wrote: # On Wed, May 12, 2004 at 11:48:06AM -0600, Scott Long wrote: # ... # # I can't remember how the 2100 BIOS works, I'll have to take a look. # # I thought that it was an attribute that was set when the array is # # created. # # Yes, and once its set at array creation time it apparently can not be # changed. I deleted the array and created it anew to disable read # caching. This did not yield any perfomance gain by itself. After I # changed the cables I now have 79MB/s (formerly only 29MB/s, a single # disk has a sustained read speed of 71MB/s at the outer sectors). Next # thing will be going back from forced U160 mode to U320. I'll report the # results, so watch this space :-) Went back to U320 and enabled packetized--even with the Adaptec cable that came with the controller no joy :-( At first, dd reported 83MB/s but after skipping the first 1G the controller(?) made a high pitched beep, and this was in dmesg aac0: **Monitor** SCSI bus reset issued on channel 0 aac0: **Monitor** <...repeats 2 more times> aac0: **Monitor** Drive 0:14:0 online on container 0: aac0: **Monitor** Drive 0:15:0 online on container 0: aac0: **Monitor** SCSI bus reset issued on channel 0 aac0: **Monitor** <...repeats 1 more times> aac0: **Monitor** Drive 0:14:0 online on container 0: aac0: **Monitor** Drive 0:15:0 online on container 0: aac0: **Monitor** SCSI bus reset issued on channel 0 aac0: **Monitor** Drive 0:15:0 returning error aac0: **Monitor** ID(0:15:0) - Cmd[0x28] failed (retries exhausted) aac0: **Monitor** Alarm Adapter Event -- turning Alarm On! aac0: **Monitor** Container 0 returning error on drive 0:15:0 aacd0: hard error cmd=read 2551359-2551486 aacd0: hard error cmd=read 5013567-5013694 ... aacd0: hard error cmd=read 35094591-35094718 aacd0: hard error cmd=read 35094719-35094846 aacd0: hard error cmd=read 35094591-35094718 aacd0: hard error cmd=read 35094719-35094846 aacd0: hard error cmd=read 37601343-37601470 aacd0: hard error cmd=read 37601471-37601598 aacd0: hard error cmd=read 37601343-37601470 aacd0: hard error cmd=read 37601471-37601598 aacd0: hard error cmd=read 37601343-37601470 aacd0: hard error cmd=read 37601471-37601598 aac0: **Monitor** ID(0:15:0) - Cmd[0x2a] failed (retries exhausted) aac0: **Monitor** Last Adapter Alarm Event -- Alarm turning off! Error probing container 0 aacd0: detached aac0: **Monitor** Drive 0:14:0 online Hmm. Should I still go for another U320 cable? Regards, Jens -- Jens Schweikhardt http://www.schweikhardt.net/ SIGSIG -- signature too long (core dumped)
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