disk timeout - system hangs

Hello,

I have a problem when i remove sata data cable on working system, then
disk timeout and system hangs with error that disk timeout. Disk is
not a system disk, when second disk is not mounted, i can remove data
cable, and system won't hangs, but when i mount it, and remove data
cable, system after few seconds will write that disk adX timeout, and
system hangs. This happens even thereis no mirror raid or i create
with 2 disks two different arrays.

dmesg:
Copyright (c) 1992-2004 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.3-RELEASE #0: Fri Nov  5 04:19:18 UTC 2004
    root_at_harlow.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (2992.51-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf33  Stepping = 3
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,S
SE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs
real memory  = 1072889856 (1023 MB)
avail memory = 1040273408 (992 MB)
ACPI APIC Table: <INTEL  S875PWP4>
ioapic0 <Version 2.0> irqs 0-23 on motherboard
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <INTEL S875PWP4> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
cpu0: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
agp0: <Intel 82875P host to AGP bridge> mem 0xfa000000-0xfbffffff at device 0.0 on pci0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pcib2: <ACPI PCI-PCI bridge> at device 3.0 on pci0
pci2: <ACPI PCI bus> on pcib2
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.7.35> port 0x9c00-0x9c1f mem 0xfc5e0000-0xfc5fffff irq 18 at device 1
.0 on pci2
em0: Ethernet address: 00:0c:f1:ed:a8:a5
em0:  Speed:N/A  Duplex:N/A
uhci0: <Intel 82801EB (ICH5) USB controller USB-A> port 0xcc00-0xcc1f irq 16 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
usb0: <Intel 82801EB (ICH5) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 82801EB (ICH5) USB controller USB-B> port 0xd000-0xd01f irq 19 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
usb1: <Intel 82801EB (ICH5) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801EB (ICH5) USB controller USB-C> port 0xd400-0xd41f irq 18 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
usb2: <Intel 82801EB (ICH5) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhci3: <Intel 82801EB (ICH5) USB controller USB-D> port 0xd800-0xd81f irq 16 at device 29.3 on pci0
uhci3: [GIANT-LOCKED]
usb3: <Intel 82801EB (ICH5) USB controller USB-D> on uhci3
usb3: USB revision 1.0
uhub3: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
pcib3: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci3: <ACPI PCI bus> on pcib3
fxp0: <Intel 82559 Pro/100 Ethernet> port 0xbc00-0xbc3f mem 0xfe900000-0xfe9fffff,0xfeafe000-0xfeafefff irq 17 at device 2.0
on pci3
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: Ethernet address: 00:90:27:aa:7e:11
pci3: <display, VGA> at device 6.0 (no driver attached)
atapci0: <Promise PDC20319 SATA150 controller> port 0xac00-0xac7f,0xb000-0xb00f,0xb400-0xb43f mem 0xfeaa0000-0xfeabffff,0xfea
fd000-0xfeafdfff irq 17 at device 7.0 on pci3
atapci0: failed: rid 0x20 is memory, requested 4
ata2: channel #0 on atapci0
ata3: channel #1 on atapci0
ata4: channel #2 on atapci0
ata5: channel #3 on atapci0
fxp1: <Intel 82801BA (D865) Pro/100 VE Ethernet> port 0xa800-0xa83f mem 0xfeafc000-0xfeafcfff irq 20 at device 8.0 on pci3
miibus1: <MII bus> on fxp1
inphy1: <i82562ET 10/100 media interface> on miibus1
inphy1:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp1: Ethernet address: 00:0c:f1:ed:a8:a7
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci1: <Intel ICH5 UDMA100 controller> port 0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0
ata0: channel #0 on atapci1
ata1: channel #1 on atapci1
atapci2: <Intel ICH5 SATA150 controller> port 0xdc00-0xdc0f,0xe000-0xe003,0xe400-0xe407,0xe800-0xe803,0xec00-0xec07 irq 18 at
 device 31.2 on pci0
ata6: channel #0 on atapci2
ata7: channel #1 on atapci2
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
acpi_button0: <Sleep Button> on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
fdc0: <floppy drive controller> port 0x3f7,0x3f4-0x3f5,0x3f2-0x3f3,0x3f0-0x3f1 irq 6 drq 2 on acpi0
fdc0: [FAST]
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
sio1: <16550A-compatible COM port> port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
ppc0: <Standard parallel printer port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (EPP/NIBBLE) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
orm0: <ISA Option ROMs> at iomem 0xd0800-0xd17ff,0xc8000-0xc8fff,0xc0000-0xc7fff on isa0
pmtimer0 on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 2992514647 Hz quality 800
Timecounters tick every 10.000 msec
acpi_cpu: throttling enabled, 8 steps (100% to 12.5%), currently 100.0%
ad4: 78167MB <Maxtor 6Y080M0/YAR51EW0> [158816/16/63] at ata2-master SATA150
ad6: 78167MB <Maxtor 6Y080M0/YAR51EW0> [158816/16/63] at ata3-master SATA150
ad8: 70911MB <WDC WD740GD-00FLA0/21.08U21> [144073/16/63] at ata4-master SATA150
ad10: 70911MB <WDC WD740GD-00FLA1/27.08D27> [144073/16/63] at ata5-master SATA150
ar0: 77247MB <ATA RAID1 array> [9847/255/63] status: READY subdisks:
 disk0 READY on ad4 at ata2-master
 disk1 READY on ad6 at ata3-master
ar1: 70571MB <ATA RAID1 array> [8996/255/63] status: READY subdisks:
 disk0 READY on ad8 at ata4-master
 disk1 READY on ad10 at ata5-master
Mounting root from ufs:/dev/ar0s1a
em0: Link is up 100 Mbps Full Duplex


-- 
Best regards,
 Arturas                          mailto:rwd_at_res.lt