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From: cschuber@passer.osg.gov.bc.ca (Cy Schubert - BCSC Open Systems Group)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: SCSI Hangs
Date: 27 Mar 1996 02:54:20 GMT
Organization: BC Systems
Lines: 101
Message-ID: <4jaaks$cn3@orca.osg.gov.bc.ca>
Reply-To: cschuber@uumail.gov.bc.ca
NNTP-Posting-Host: passer.osg.gov.bc.ca
X-Newsreader: TIN [version 1.2 PL2]
I've been having a number of problems with SCSI bus hangs when accessing
certain files (100% repeatable) on a Plextor 4Plex CDROM drive hung off
an Adaptec 1542CF.
My configuration is as follows:
Mar 26 06:21:24 cwsys /kernel: FreeBSD 2.1.0-RELEASE #0: Wed Mar 6 20:21:33 PST
1996
Mar 26 06:21:24 cwsys /kernel: root@cwsys:/usr/src/sys/compile/CWSYS
Mar 26 06:21:25 cwsys /kernel: CPU: i486DX (486-class CPU)
Mar 26 06:21:25 cwsys /kernel: real memory = 20971520 (20480K bytes)
Mar 26 06:21:25 cwsys /kernel: avail memory = 18784256 (18344K bytes)
Mar 26 06:21:25 cwsys /kernel: Probing for devices on the ISA bus:
Mar 26 06:21:25 cwsys /kernel: sc0 at 0x60-0x6f irq 1 on motherboard
Mar 26 06:21:25 cwsys /kernel: sc0: VGA color <16 virtual consoles, flags=0x0>
Mar 26 06:21:25 cwsys /kernel: ed0 at 0x280-0x29f irq 5 maddr 0xd8000 msize 1638
4 on isa
Mar 26 06:21:25 cwsys /kernel: ed0: address 00:00:c0:eb:b1:4a, type WD8013EPC (1
6 bit)
Mar 26 06:21:25 cwsys /kernel: sio0 at 0x3f8-0x3ff irq 4 on isa
Mar 26 06:21:25 cwsys /kernel: sio0: type 16550A
Mar 26 06:21:25 cwsys /kernel: sio1 at 0x2f8-0x2ff irq 3 on isa
Mar 26 06:21:26 cwsys /kernel: sio1: type 16550A
Mar 26 06:21:26 cwsys /kernel: lpt0 at 0x378-0x37f irq 7 on isa
Mar 26 06:21:26 cwsys /kernel: lpt0: Interrupt-driven port
Mar 26 06:21:26 cwsys /kernel: lp0: TCP/IP capable interface
Mar 26 06:21:26 cwsys /kernel: fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
Mar 26 06:21:26 cwsys /kernel: fdc0: NEC 765
Mar 26 06:21:26 cwsys /kernel: fd0: 1.44MB 3.5in
Mar 26 06:21:26 cwsys /kernel: fd1: 1.2MB 5.25in
Mar 26 06:21:26 cwsys /kernel: wdc0 at 0x1f0-0x1f7 irq 14 on isa
Mar 26 06:21:26 cwsys /kernel: wdc0: unit 0 (wd0): <WDC AC280>
Mar 26 06:21:27 cwsys /kernel: wd0: 81MB (166600 sectors), 980 cyls, 10 heads, 1
7 S/T, 512 B/S
Mar 26 06:21:27 cwsys /kernel: wdc0: unit 1 (wd1): <ST3491A>
Mar 26 06:21:27 cwsys /kernel: wd1: 408MB (836070 sectors), 899 cyls, 15 heads,
62 S/T, 512 B/S
Mar 26 06:21:27 cwsys /kernel: aha0 at 0x330-0x333 irq 11 drq 5 on isa
Mar 26 06:21:27 cwsys /kernel: aha0 waiting for scsi devices to settle
Mar 26 06:21:28 cwsys /kernel: (aha0:2:0): "PLEXTOR CD-ROM PX-4XCH 1.22" type 5
removable SCSI 2
Mar 26 06:21:28 cwsys /kernel: cd0(aha0:2:0): CD-ROM cd present.[338084 x 2048 b
yte records]
Mar 26 06:21:28 cwsys /kernel: (aha0:4:0): "ARCHIVE Python 28388-XXX 5.45" type
1 removable SCSI 2
Mar 26 06:21:28 cwsys /kernel: st0(aha0:4:0): Sequential-Access density code 0x1
3, drive empty
Mar 26 06:21:28 cwsys /kernel: (aha0:6:0): "QUANTUM LIGHTNING 730S 241E" type 0
fixed SCSI 2
Mar 26 06:21:28 cwsys /kernel: sd0(aha0:6:0): Direct-Access 699MB (1431760 512 b
yte sectors)
Mar 26 06:21:28 cwsys /kernel: npx0 on motherboard
Mar 26 06:21:29 cwsys /kernel: npx0: INT 16 interface
Messages at the time of the SCSI hang are:
Mar 24 08:50:44 cwsys /kernel: cd0(aha0:2:0): timed out
Mar 24 08:51:26 cwsys /kernel: cd0(aha0:2:0): timed out
Mar 24 08:52:00 cwsys last message repeated 2 times
Mar 24 08:52:00 cwsys /kernel: adapter not taking commands.. frozen?!
Mar 24 08:52:00 cwsys /kernel: Debugger("aha1542") called.
Mar 24 08:52:00 cwsys /kernel: AGAIN
Mar 24 08:52:00 cwsys /kernel: aha0: MBO 02 and not 00 (free)
Mar 24 08:52:11 cwsys /kernel: sd0(aha0:6:0): timed out
Mar 24 08:52:11 cwsys /kernel: adapter not taking commands.. frozen?!
Mar 24 08:52:11 cwsys /kernel: Debugger("aha1542") called.
Mar 24 08:52:11 cwsys /kernel:
Mar 24 08:52:15 cwsys /kernel: sd0(aha0:6:0): timed out
Mar 24 08:52:15 cwsys /kernel: adapter not taking commands.. frozen?!
Mar 24 08:52:15 cwsys /kernel: adapter not taking commands.. frozen?!
Mar 24 08:52:15 cwsys /kernel: Debugger("aha1542") called.
Mar 24 08:52:15 cwsys /kernel: AGAIN
Mar 24 08:52:16 cwsys /kernel: aha0: MBO 02 and not 00 (free)
Mar 24 08:52:16 cwsys /kernel: vnode_pager_input: I/O read error
Mar 24 08:52:16 cwsys /kernel: vm_fault: pager input (probably hardware) error,
PID 109 failure
This continues until the system most of my processes are killed, due to a
swapfile (one swap file on each of three disks) on the SCSI hard disk being
inaccessable.
I've managed to solve the problem by setting a jumper on the CDROM drive
to disable the 4 spin feature, essentially forcing into single spin mode.
When I used to use Linux I had no problems accessing the CDROM drive in
quad spin mode -- probably ruling out any real hardware problems.
My question is has anyone else encoutered SCSI bus hangs with quad spin
CDROM drives or with Plextor devices?
Please respond to cschuber@uumail.gov.bc.ca as my desktop system will not
accept SMTP connections.
Regards, Phone: (604)389-3827
Cy Schubert OV/VM: BCSC02(CSCHUBER)
Open Systems Support BITNET: CSCHUBER@BCSC02.BITNET
BC Systems Corp. Internet: cschuber@uumail.gov.bc.ca
cschuber@bcsc02.gov.bc.ca
"Quit spooling around, JES do it."