Hi,
after installing a new disk (IBM DNES-309170W U2W SE/LVD - was cheaper
than the UW model :-) on my SYMBIOS Controller (sym53c875 rev. 4). I
noticed that during heavy disk i/o (e.g. creating a cdrom image or doing
"cat /dev/zero > some_file") the load goes up to 3 or more and the system
becomes totally unusable. Mostly all programs called during this time
starting after the i/o load is gone. First I thought it was the cable
length since it was 2m in length and ultra scsi spec doesn't allow greater
than 1.5m in my case. Both ends are are terminated (active). I even had
some wrong data during transfer (but very seldom). So I shorted my narrow
cable to fit the spec. But at least the problem with the heavy load and
system unusability is still there. Without this new disk I had no such
problems. What's the problem here?
*****************
My configuration:
*****************
------------------------------------------------------------------
SCSI boot messages:
...
sym53c8xx:setup=disc:y,specf:1,ultra:2,tags:8,sync:12,burst:7,wide:y,diff:3,revprob:n,buschk:0x1
sym53c8xx:setup=mpar:y,spar:y,fsn=n,verb:2,debug:0x0,led:y,settle:2,irqm:0x0,nvram:0x1,pcifix:0x7
sym53c8xx: at PCI bus 0, device 11, function 0
sym53c8xx: setting PCI_COMMAND_PARITY...(fix-up)
sym53c8xx: setting PCI_LATENCY_TIMER to 80 (fix-up).
sym53c8xx: 53c875 detected with Symbios NVRAM
sym53c875-0: rev=0x04, base=0xdd800000, io_port=0xd400, irq=15
sym53c875-0: using memory mapped IO
sym53c875-0: clock multiplier found
sym53c875-0: Symbios format NVRAM, ID 7, Fast-20, Parity Checking
sym53c875-0: initial SCNTL3/DMODE/DCNTL/CTEST3/4/5 = (hex) 05/4e/80/01/00/24
sym53c875-0: final SCNTL3/DMODE/DCNTL/CTEST3/4/5 = (hex) 05/46/80/01/08/24
sym53c875-0: on-chip RAM at 0xdd000000
sym53c875-0: resetting, command processing suspended for 2 seconds
sym53c875-0: restart (scsi reset).
sym53c875-0: enabling clock multiplier
sym53c875-0: Downloading SCSI SCRIPTS.
scsi0 : sym53c8xx - version 1.3g
scsi : 1 host.
sym53c875-0: command processing resumed
Vendor: IBM Model: DNES-309170W Rev: SA30
Type: Direct-Access ANSI SCSI revision: 03
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
Vendor: IBM Model: DCAS-34330W Rev: S65A
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdb at scsi0, channel 0, id 1, lun 0
Vendor: FUJITSU Model: M2513E Rev: 0060
Type: Optical Device ANSI SCSI revision: 02
Detected scsi removable disk sdc at scsi0, channel 0, id 2, lun 0
Vendor: PLEXTOR Model: CD-ROM PX-40TS Rev: 1.01
Type: CD-ROM ANSI SCSI revision: 02
Vendor: TEAC Model: CD-R55S Rev: 1.0L
Type: CD-ROM ANSI SCSI revision: 02
...
-------------------------------------------------------------------
System: K6-III/400 - 160 MB RAM
Kernel: 2.2.12
The segmented cache of the IBM DNES-309170W is currently devided into 7
segments of 256 kB each. Tagged command queuing is set to 16 for
both disks.
ron
PS: Why are there no driver patches (or complete tar.gz's) for the 2.2.12
kernel? That kernel is out for some time now and seems to be stable.
The patch for 2.2.9 doesn't work - it's hard to apply it manually
since many hunks fail.
--
/\/\ Ronald Wahl -- [EMAIL PROTECTED] /\/\ C S N /\/\
\/\/ ------------------------------- \/\/ ---------------------- \/\/
/\/\ http://www.tu-chemnitz.de/~row/ /\/\ network administration /\/\
\/\/ PGP key available \/\/ system management \/\/
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