Based on advise from the list, I ordered a custom built cable from CS
Electronics asking for the best quality they had: 3' LVD teflon with
active negation terminator. A $125US later, system still hangs. Bummer.
I have now spent five weeks off-and-on trying to find out why the system
with a new Adaptec 2940U2W and 2xSegate LVD drives hangs momentarily
(using 2.2.14 kernel with raid-2.2.14-B1 patch). The closest thing I
have to a cause is that it seems to happen only when there is a load
(medium to heavy) on the server and it happens less when I reduce the
speed in the SCSI controller from 80Mb to 40Mb.
I'd appreciate any suggestions other than using my disk drives for skeet
practice and other than what I have already tried:
* set up remote logging to catch any error message (none logged);
* added verbose debugging (nothing);
* upgraded the AIC7xxx driver from 5.1.21 to 5.1.28 (performance
improved but it still hangs);
* removed the IDE drives and kernel support for IDE, based on
someone's hunch;
* lowered the front bus speed from 100.3Mhz to 88.3 (underclocking
CPU), based on another hunch;
* checked IRQs for conflicts;
* compiled the kernel with and without tagged command queuing,
with more and fewer max commands;
* tried kernels 2.1.10 to 2.1.14 with appropriate RAID patches;
* repeatedly searched the archives of mailing lists for aic7xxx,
linux-scsi, Adaptec, and ASUS -- no luck.
* removed my RAID-1 and added it back in (unable to fully
test this);
* checked cabinet temperature, which is same as room (about 72F),
but no verification on exact temperature of drives.
* reduced SCSI controller speed (as previously mentioned) on Seagate
drives to 40MB from 80MB (appears to reduce but not eliminate
problem);
No matter what, the system hangs for 30 seconds to several minutes,
several times per day. Programs continue to run, but any requests are
halted until the disks begin responding again.
Thanks,
Jeff Hill
Current Configuration:
----------------------
2.2.14 kernel with raid-2.2.14-B1 patch
Adaptec 2940U2W (2.20.0 bios)
Short, internal Ultra2-LVD cable.
2xSeagateST39103LW (U2W drives)
Single PII 400Mhz
ASUS P3B-F motherboard (Intel 440BX AGPset); CPU Bus/PCI Freq -
100.3/33.43
Tagged Command Queueing enabled; max 24 commands per device; reset delay
at default 5 seconds
Standard Kernel Boot:
----------------------------
Apr 17 08:00:51 apache kernel: Linux version 2.2.14 (root@apache) (gcc
version 2.95.2 20000313 (Debian GNU/Linux)) #1 Wed Apr 12 21:43:09 EDT
2000
Apr 17 08:00:51 apache kernel: Detected 333230761 Hz processor.
Apr 17 08:00:51 apache kernel: Console: colour VGA+ 80x25
Apr 17 08:00:51 apache kernel: Calibrating delay loop... 332.60 BogoMIPS
Apr 17 08:00:51 apache kernel: Memory: 517412k/524288k available (1020k
kernel code, 412k reserved, 5396k data, 48k init)
Apr 17 08:00:51 apache kernel: Dentry hash table entries: 65536 (order
7, 512k)
Apr 17 08:00:51 apache kernel: Buffer cache hash table entries: 524288
(order 9, 2048k)
Apr 17 08:00:51 apache kernel: Page cache hash table entries: 131072
(order 7, 512k)
Apr 17 08:00:51 apache kernel: CPU: Intel Pentium II (Deschutes)
stepping 02
Apr 17 08:00:51 apache kernel: Checking 386/387 coupling... OK, FPU
using exception 16 error reporting.
Apr 17 08:00:51 apache kernel: Checking 'hlt' instruction... OK.
Apr 17 08:00:51 apache kernel: POSIX conformance testing by UNIFIX
Apr 17 08:00:51 apache kernel: PCI: PCI BIOS revision 2.10 entry at
0xf08b0
Apr 17 08:00:51 apache kernel: PCI: Using configuration type 1
Apr 17 08:00:51 apache kernel: PCI: Probing PCI hardware
Apr 17 08:00:51 apache kernel: Linux NET4.0 for Linux 2.2
Apr 17 08:00:51 apache kernel: Based upon Swansea University Computer
Society NET3.039
Apr 17 08:00:51 apache kernel: NET4: Unix domain sockets 1.0 for Linux
NET4.0.
Apr 17 08:00:51 apache kernel: NET4: Linux TCP/IP 1.0 for NET4.0
Apr 17 08:00:51 apache kernel: IP Protocols: ICMP, UDP, TCP
Apr 17 08:00:51 apache kernel: TCP: Hash tables configured (ehash 524288
bhash 65536)
Apr 17 08:00:51 apache kernel: Starting kswapd v 1.5
Apr 17 08:00:51 apache kernel: Serial driver version 4.27 with no serial
options enabled
Apr 17 08:00:51 apache kernel: ttyS00 at 0x03f8 (irq = 4) is a 16550A
Apr 17 08:00:51 apache kernel: ttyS01 at 0x02f8 (irq = 3) is a 16550A
Apr 17 08:00:51 apache kernel: pty: 256 Unix98 ptys configured
Apr 17 08:00:51 apache kernel: RAM disk driver initialized: 16 RAM
disks of 4096K size
Apr 17 08:00:51 apache kernel: PIIX4: IDE controller on PCI bus 00 dev
21
Apr 17 08:00:51 apache kernel: PIIX4: device not capable of full native
PCI mode
Apr 17 08:00:51 apache kernel: PIIX4: device disabled (BIOS)
Apr 17 08:00:51 apache kernel: Floppy drive(s): fd0 is 1.44M
Apr 17 08:00:51 apache kernel: FDC 0 is a post-1991 82077
Apr 17 08:00:51 apache kernel: md driver 0.90.0 MAX_MD_DEVS=256,
MAX_REAL=12
Apr 17 08:00:51 apache kernel: linear personality registered
Apr 17 08:00:51 apache kernel: raid1 personality registered
Apr 17 08:00:51 apache kernel: (scsi0) <Adaptec AHA-294X Ultra2 SCSI
host adapter> found at PCI 0/12/0
Apr 17 08:00:51 apache kernel: (scsi0) Wide Channel, SCSI ID=7, 32/255
SCBs
Apr 17 08:00:51 apache kernel: (scsi0) Downloading sequencer code... 396
instructions downloaded
Apr 17 08:00:51 apache kernel: scsi0 : Adaptec AHA274x/284x/294x
(EISA/VLB/PCI-Fast SCSI) 5.1.28/3.2.4
Apr 17 08:00:51 apache kernel: <Adaptec AHA-294X Ultra2 SCSI host
adapter>
Apr 17 08:00:51 apache kernel: scsi : 1 host.
Apr 17 08:00:51 apache kernel: (scsi0:0:0:0) Synchronous at 80.0
Mbyte/sec, offset 15.
Apr 17 08:00:51 apache kernel: Vendor: SEAGATE Model:
ST39103LW Rev: 0002
Apr 17 08:00:51 apache kernel: Type:
Direct-Access ANSI SCSI revision: 02
Apr 17 08:00:51 apache kernel: Detected scsi disk sda at scsi0,
channel0, id 0, lun 0
Apr 17 08:00:51 apache kernel: (scsi0:0:1:0) Synchronous at 80.0
Mbyte/sec, offset 15.
Apr 17 08:00:51 apache kernel: Vendor: SEAGATE Model:
ST39103LW Rev: 0002
Apr 17 08:00:51 apache kernel: Type:
Direct-Access ANSI SCSI revision: 02
Apr 17 08:00:51 apache kernel: Detected scsi disk sdb at scsi0, channel
0, id 1, lun 0
Apr 17 08:00:51 apache kernel: scsi : detected 2 SCSI disks total.
Apr 17 08:00:51 apache kernel: SCSI device sda: hdwr sector= 512 bytes.
Sectors= 17783240 [8683 MB] [8.7 GB]
Apr 17 08:00:51 apache kernel: SCSI device sdb: hdwr sector= 512 bytes.
Sectors= 17783240 [8683 MB] [8.7 GB]
Apr 17 08:00:51 apache kernel: ne.c:v1.10 9/23/94 Donald Becker
([EMAIL PROTECTED])
Apr 17 08:00:51 apache kernel: NE*000 ethercard probe at 0x300: 00 40 05
2c 0d 1d
Apr 17 08:00:51 apache kernel: eth0: NE2000 found at 0x300, using IRQ 3.
Apr 17 08:00:51 apache kernel: Partition check:
Apr 17 08:00:51 apache kernel: sda: sda1 sda2 sda3
Apr 17 08:00:51 apache kernel: sdb: sdb1 sdb2 sdb3
Apr 17 08:00:51 apache kernel: md.c: sizeof(mdp_super_t) = 4096
Apr 17 08:00:51 apache kernel: autodetecting RAID arrays
Apr 17 08:00:51 apache kernel: (read) sda2's sb offset: 8739264 [events:
0000004b]
Apr 17 08:00:51 apache kernel: (read) sda3's sb offset: 128448 [events:
00000002]
Apr 17 08:00:51 apache kernel: (read) sdb2's sb offset: 8739264 [events:
0000004b]
Apr 17 08:00:51 apache kernel: (read) sdb3's sb offset: 128448 [events:
00000002]
Apr 17 08:00:51 apache kernel: autorun ...
Apr 17 08:00:51 apache kernel: considering sdb3 ...
Apr 17 08:00:51 apache kernel: adding sdb3 ...
Apr 17 08:00:51 apache kernel: adding sda3 ...
Apr 17 08:00:51 apache kernel: created md2
Apr 17 08:00:51 apache kernel: bind<sda3,1>
Apr 17 08:00:51 apache kernel: bind<sdb3,2>
Apr 17 08:00:51 apache kernel: running: <sdb3><sda3>
Apr 17 08:00:51 apache kernel: now!
Apr 17 08:00:51 apache kernel: sdb3's event counter: 00000002
Apr 17 08:00:51 apache kernel: sda3's event counter: 00000002
Apr 17 08:00:51 apache kernel: md2: max total readahead window set to
128k
Apr 17 08:00:51 apache kernel: md2: 1 data-disks, max readahead per
data-disk: 128k
Apr 17 08:00:51 apache kernel: raid1: device sdb3 operational as mirror
1
Apr 17 08:00:51 apache kernel: raid1: device sda3 operational as mirror
0
Apr 17 08:00:51 apache kernel: (checking disk 0)
Apr 17 08:00:51 apache kernel: (really checking disk 0)
Apr 17 08:00:51 apache kernel: (checking disk 1)
Apr 17 08:00:51 apache kernel: (really checking disk 1)
Apr 17 08:00:51 apache kernel: (checking disk 2)
Apr 17 08:00:51 apache kernel: (checking disk 3)
Apr 17 08:00:51 apache kernel: (checking disk 4)
Apr 17 08:00:51 apache kernel: (checking disk 5)
Apr 17 08:00:51 apache kernel: (checking disk 6)
Apr 17 08:00:51 apache kernel: (checking disk 6)
Apr 17 08:00:51 apache kernel: (checking disk 10)
Apr 17 08:00:51 apache kernel: (checking disk 11)
Apr 17 08:00:51 apache kernel: md: updating md2 RAID superblock on
device
Apr 17 08:00:51 apache kernel: sda3 [events: 00000003](write) sda3's sb
offset: 128448
Apr 17 08:00:51 apache kernel: created md0
Apr 17 08:00:51 apache kernel: running: <sdb2><sda2>
Apr 17 08:00:51 apache kernel: sda2's event counter: 0000004b
Apr 17 08:00:51 apache kernel: (checking disk 0)
Apr 17 08:00:51 apache kernel: (really checking disk 1)
Apr 17 08:00:51 apache kernel: (checking disk 4)
Apr 17 08:00:51 apache kernel: (checking disk 9)
Apr 17 08:00:51 apache kernel: (checking disk 10)
Apr 17 08:00:51 apache kernel: raid1: raid set md0 active with 2 out of
2 mirrors
Apr 17 08:00:51 apache kernel: sda2 [events: 0000004c](write) sda2's sb
offset: 8739264
Apr 17 08:00:51 apache kernel: Adding Swap: 128444k swap-space (priority
-1)
--
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