Date: 08 Nov 1999 22:34:38 +0200 From: Vadim Belman <voland@plab.ku.dk> To: Yuri Vorobyev <vorob@yamalinfo.ru> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: ccd performance degradation & reboot problem Message-ID: <85zowoiuxt.fsf@dialup422.apex.dp.ua> In-Reply-To: Yuri Vorobyev's message of "Mon, 8 Nov 1999 11:56:34 %2B0500" References: <4497.991108@yamalinfo.ru>
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Hi Yuri!
On 08 Nov 99 at 08:56, "Yuri" (Yuri Vorobyev) wrote:
Yuri> I have made some tests with bonnie.
Yuri> 3.1-RELEASE -------Sequential Output-------- ---Sequential Input--
Yuri> --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block---
Yuri> --Seeks--- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
Yuri> K/sec %CPU /sec %CPU 100 10085 83.9 13683 38.7 4808 15.5 7716 75.0
Yuri> 14429 26.2 213.7 4.4
Yuri> FreeBSD 3.3-STABLE #0: Mon Nov 8
Yuri> -------Sequential Output-------- ---Sequential Input--
Yuri> --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block---
Yuri> --Seeks--- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
Yuri> K/sec %CPU /sec %CPU 100 1866 16.1 1802 4.3 1828 6.1 8177 80.1 14384
Yuri> 25.7 213.8 5.2
Yuri> Kernel config was the same.
Yuri> Write speed has fallen very much!!
This may not be related to the problem's cause, but I usually try
different interleave factors using a script which records bonnie's
output for later analysis. Differences are significant for various
interleaves, but never falls below actual drive speed. So, this
rather looks like a wrong way but may be useful information in
future. (BTW, my ccd uses interleave factor of 256 and used to be
512 in previous configuration. Both values based on benchmark
results.)
You may also make sure that you didn't check your da0 drive second
time. 8) There are few perfomance issues about IBM DCAS drives.
Yuri> syncing disks... done (da1:ahc0:0:1:0) SYNCHRONIZE CACHE: CDB: 35 0
Yuri> 0 0 0 0 0 0 0 0 (da1:ahc0:0:1:0) ILLEGAL REQUEST asc:20,0
Yuri> (da1:ahc0:0:1:0) invalid command operation code sks:c0,0
Yuri> Rebooting...
Yuri> or
Yuri> #reboot
Yuri> syncing disks... done (da1:ahc0:0:1:0) SYNCHRONIZE CACHE: CDB: 35 0
Yuri> 0 0 0 0 0 0 0 0 (da1:ahc0:0:1:0) error code 9 Rebooting...
Yuri> Error code change randomly (?)
Yuri> And freeze...
Have you had a look on server's console during benchmarking? I'd
expect some SCSI-related error messages on it. You may suffer
either from hardware problems or from a driver bug. The second
possibility seems to be rather improbable.
But the first one is practically definite. Check your cable
connection, run SCSI BIOS hardware test. I.e. make sure that da1
works properly. Or not...
Yuri> System have ADAPTEC 2940 ULTRA / ULTRA W BIOS v1.25
Ahm, I read some recomendations about upgrading SCSI BIOS to any of
1.3x version. Actually it's been done for my board.
--
/Voland Vadim Belman
E-mail: voland@plab.ku.dk
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