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Date:      Tue, 9 Jan 2001 16:55:13 +0100
From:      Michel Quadflieg <michel@nl.euro.net>
To:        freebsd-questions@freebsd.org
Subject:   Crashing machine when high disk activity
Message-ID:  <20010109165513.A28276@god.euronet.nl>

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Hya all,

I got a problem with a machine which crashes when there is a lot 
of disk activity via network (either ftp or samba).

Info on the machine:
4.2-STABLE FreeBSD 4.2-STABLE #0: Thu Nov 30 03:15:37 CET 2000
CPU: Pentium II/Pentium II Xeon/Celeron (501.14-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x665  Stepping = 5

Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
real memory  = 268369920 (262080K bytes)
avail memory = 257417216 (251384K bytes)
atapci0: <VIA 82C596 ATA66 controller> port 0x6400-0x640f at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
sym0: <895> port 0x6c00-0x6cff mem 0xec101000-0xec101fff,0xec102000-0xec1020ff irq 10 at device 9.0 on pci0
sym0: Tekram NVRAM, ID 7, Fast-40, LVD, parity checking
fxp0: <Intel Pro 10/100B/100+ Ethernet> port 0x7000-0x703f mem 0xec000000-0xec0fffff,0xec100000-0xec100fff irq 11 at device 12.0 on pci0
ad0: 4884MB <Maxtor 90510D4> [9925/16/63] at ata0-master UDMA33
ad1: 19569MB <WDC WD205AA> [39761/16/63] at ata0-slave UDMA66
ad2: 26105MB <WDC WD273BA> [53040/16/63] at ata1-master UDMA66
ad3: 26105MB <WDC WD273BA> [53040/16/63] at ata1-slave UDMA66
Waiting 15 seconds for SCSI devices to settle
Mounting root from ufs:/dev/ad0s1a
da0 at sym0 bus 0 target 6 lun 0
da0: <QUANTUM ATLAS IV 36 WLS 0909> Fixed Direct Access SCSI-3 device 
da0: 40.000MB/s transfers (20.000MHz, offset 31, 16bit), Tagged Queueing Enabled
da0: 35044MB (71770336 512 byte sectors: 255H 63S/T 4467C)

Filesystem  1K-blocks     Used    Avail Capacity  Mounted on
/dev/ad0s1a   4333780   700726  3286352    18%    /
procfs              4        4        0   100%    /proc
/dev/ad1s1e  19422590 12749018  5119765    71%    /d4
/dev/ad2s1e  25909571 16006049  7830757    67%    /d2
/dev/ad3s1e  25909571 22867037   969769    96%    /d3
/dev/da0s1e  34777166 27923973  4071020    87%    /d1


I experience this problem on more machines with large disks.
I hope somebody can give me a hint on how to solve this problem.

-- 
Michel Quadflieg



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