Hi,
I have the following scenario:

A30p <==> disk1 <==> disk2
disk1 and disk2 are identical 200GB disks in an extarnal ICE-cube case.
My dmesg output is attached.

After creating and mounting them as UFS2 filesystems under /mnt/a /mnt/b
and starting a `iozone -s 102400m -r 1024k` in parallel under each FS I get
very quickly:
...
No ocb on the queue for target 0.
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue
No ocb on the queue for target 0.
No ocb on the queue for target 0.
No ocb on the queue for target 0.
No ocb on the queue for target 0.
...

The only way to get out is `fwcontrol -r`.

BUT:
If starting only one `iozone -s 102400m -r 1024k` in either /mnt/a or /mnt/b
the command runs for several hours without problems.

Do we have a problem with concurrent accesses or do I just have a HW problem.

Any tips for further debugging BTW?

Bye!
----
Michael Reifenberger
^.*Plaut.*$, IT, R/3 Basis, GPS
cam: invalid value for tunable kern.cam.scsi_delay
Copyright (c) 1992-2003 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 5.0-CURRENT #0: Tue Jan 28 08:17:11 CET 2003
    root@nihil:/usr/src/sys/i386/compile/nihil
Preloaded elf kernel "/boot/kernel/kernel" at 0xc054e000.
Preloaded userconfig_script "/boot/kernel.conf" at 0xc054e0a8.
Preloaded elf module "/boot/kernel/procfs.ko" at 0xc054e0f8.
Preloaded elf module "/boot/kernel/pseudofs.ko" at 0xc054e1a4.
Preloaded elf module "/boot/kernel/md.ko" at 0xc054e254.
Preloaded elf module "/boot/kernel/linux.ko" at 0xc054e2fc.
Preloaded elf module "/boot/kernel/sysvshm.ko" at 0xc054e3a8.
Preloaded elf module "/boot/kernel/sysvsem.ko" at 0xc054e454.
Preloaded elf module "/boot/kernel/sysvmsg.ko" at 0xc054e500.
Preloaded elf module "/boot/kernel/miibus.ko" at 0xc054e5ac.
Preloaded elf module "/boot/kernel/if_dc.ko" at 0xc054e658.
Preloaded elf module "/boot/kernel/if_ed.ko" at 0xc054e704.
Preloaded elf module "/boot/kernel/if_ep.ko" at 0xc054e7b0.
Preloaded elf module "/boot/kernel/if_fxp.ko" at 0xc054e85c.
Preloaded elf module "/boot/kernel/snd_ich.ko" at 0xc054e908.
Preloaded elf module "/boot/kernel/snd_pcm.ko" at 0xc054e9b4.
Preloaded elf module "/boot/kernel/usb.ko" at 0xc054ea60.
Preloaded elf module "/boot/kernel/ums.ko" at 0xc054eb08.
Preloaded elf module "/boot/kernel/umass.ko" at 0xc054ebb0.
Preloaded elf module "/boot/kernel/linprocfs.ko" at 0xc054ec5c.
Preloaded elf module "/boot/kernel/radeon.ko" at 0xc054ed0c.
Preloaded elf module "/boot/kernel/aic.ko" at 0xc054edb8.
Preloaded elf module "/boot/kernel/nfsserver.ko" at 0xc054ee60.
Preloaded elf module "/boot/kernel/nfsclient.ko" at 0xc054ef10.
Preloaded elf module "/boot/kernel/firewire.ko" at 0xc054efc0.
Preloaded elf module "/boot/kernel/sbp.ko" at 0xc054f070.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc054f118.
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 1198986039 Hz
CPU: Intel(R) Pentium(R) III Mobile CPU      1200MHz (1198.99-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x6b1  Stepping = 1
  
Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>

real memory  = 1073086464 (1023 MB)
avail memory = 1037750272 (989 MB)
Initializing GEOMetry subsystem
Pentium Pro MTRR support enabled
VESA: v2.0, 32704k memory, flags:0x1, mode table:0xc03500a2 (1000022)
VESA: ATI MOBILITY RADEON
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <IBM    TP-1E   > on motherboard
    ACPI-0625: *** Info: GPE Block0 defined as GPE0 to GPE15
    ACPI-0625: *** Info: GPE Block1 defined as GPE16 to GPE31
Using $PIR table, 14 entries at 0xc00fdeb0
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
acpi0: power button is handled as a fixed feature programming model.
Timecounter "ACPI-fast"  frequency 3579545 Hz
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_tz0: <thermal zone> on acpi0
acpi_lid0: <Control Method Lid Switch> on acpi0
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
acpi_button0: <Sleep Button> on acpi0
    ACPI-1287: *** Error: Method execution failed, AE_NOT_EXIST
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
agp0: <Intel 82830 host to AGP bridge> mem 0xd0000000-0xdfffffff at device 0.0 on pci0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
drm0: <ATI Radeon LY Mobility 6 (AGP)> port 0x3000-0x30ff mem 
0xc0100000-0xc010ffff,0xe0000000-0xe7ffffff irq 11 at device 0.0 on pci1
info: [drm] AGP at 0xd0000000 256MB
info: [drm] Initialized radeon 1.1.1 20010405 on minor 0
uhci0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> port 0x1800-0x181f irq 11 at 
device 29.0 on pci0
usb0: <Intel 82801CA/CAM (ICH3) 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 82801CA/CAM (ICH3) USB controller USB-B> port 0x1820-0x183f irq 11 at 
device 29.1 on pci0
usb1: <Intel 82801CA/CAM (ICH3) 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
ums0: Logitech USB-PS/2 Optical Mouse, rev 2.00/11.00, addr 2, iclass 3/1
ums0: 3 buttons and Z dir.
uhci2: <Intel 82801CA/CAM (ICH3) USB controller USB-C> port 0x1840-0x185f irq 11 at 
device 29.2 on pci0
usb2: <Intel 82801CA/CAM (ICH3) 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
pcib2: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci2: <ACPI PCI bus> on pcib2
cbb0: <RF5C478 PCI-CardBus Bridge> mem 0x50000000-0x50000fff irq 11 at device 0.0 on 
pci2
start (50000000) < sc->membase (c0200000)
start (50000000) < sc->pmembase (e8000000)
cardbus0: <CardBus bus> on cbb0
pccard0: <16-bit PCCard bus> on cbb0
cbb0: cbb_power: CARD_VCC_0V and CARD_VPP_0V [44]
cbb1: <RF5C478 PCI-CardBus Bridge> mem 0x50100000-0x50100fff irq 11 at device 0.1 on 
pci2
start (50100000) < sc->membase (c0200000)
start (50100000) < sc->pmembase (e8000000)
cardbus1: <CardBus bus> on cbb1
pccard1: <16-bit PCCard bus> on cbb1
cbb1: cbb_power: CARD_VCC_0V and CARD_VPP_0V [44]
fwohci0: vendor=1180, dev=522
fwohci0: <1394 Open Host Controller Interface> mem 0xc0201000-0xc02017ff irq 11 at 
device 0.2 on pci2
fwohci0: PCI bus latency was changing to 250.
fwohci0: OHCI version 1.0 (ROM=0)
fwohci0: No. of Isochronous channel is 4.
fwohci0: EUI64 00:06:1b:02:01:00:0e:92
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
sbp0: <SBP2/SCSI over firewire> on firewire0
fxp0: <Intel Pro/100 Ethernet> port 0x8000-0x803f mem 0xc0200000-0xc0200fff irq 11 at 
device 8.0 on pci2
fxp0: Ethernet address 00:d0:59:34:81:d3
inphy0: <i82562ET 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH3 ATA100 controller> port 
0x1860-0x186f,0x374-0x377,0x170-0x177,0x3f4-0x3f7,0x1f0-0x1f7 at device 31.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
ichsmb0: <Intel 82801CA (ICH3) SMBus controller> port 0x1880-0x189f irq 11 at device 
31.3 on pci0
smbus0: <System Management Bus> on ichsmb0
smb0: <SMBus generic I/O> on smbus0
pcm0: <Intel 82801CA (ICH3)> port 0x18c0-0x18ff,0x1c00-0x1cff irq 11 at device 31.5 on 
pci0
pci0: <simple comms> at device 31.6 (no driver attached)
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model Generic PS/2 mouse, device ID 0
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
ppc0 port 0x7bc-0x7be,0x3bc-0x3c3 irq 7 drq 0 on acpi0
ppc0: Generic chipset (ECP/PS2/NIBBLE) in COMPATIBLE mode
ppi0: <Parallel I/O> on ppbus0
pps0: <Pulse per second Timing Interface> on ppbus0
sio1 port 0x2f8-0x2ff irq 3 drq 3 on acpi0
sio1: type 16550A
acpi_ec0: <embedded controller> port 0x66,0x62 on acpi0
acpi_cmbat0: <Control method Battery> on acpi0
acpi_cmbat1: <Control method Battery> on acpi0
acpi_acad0: <AC adapter> on acpi0
orm0: <Option ROMs> at iomem 
0xe0000-0xeffff,0xdc000-0xdffff,0xd1000-0xd1fff,0xd0000-0xd0fff,0xc0000-0xcffff on 
isa0
sc0: <System console> on isa0
sc0: VGA <16 virtual consoles, flags=0x200>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 10.000 msec
IPsec: Initialized Security Association Processing.
fwohci0: BUS reset
fwohci0: node_id = 0xc800ffc2, CYCLEMASTER mode
firewire0: 3 nodes, maxhop <= 2, cable IRM = 2 (me)
system power profile changed to 'economy'
ad0: 45780MB <IC25T048ATDA05-0> [93015/16/63] at ata0-master UDMA100
firewire0: New S400 device ID:0001d200e00d31f1
firewire0: New S400 device ID:0001d200e00d2f5d
firewire0: Device SBP-II
firewire0: Device SBP-II
ad1: 30520MB <IBM-DJSA-232> [62010/16/63] at ata1-master UDMA66
acd0: CD-RW <TOSHIBA DVD-ROM SD-R2002> at ata0-slave UDMA33
da0 at sbp0 bus 0 target 0 lun 0
da0: <Oxford S OXFORD IDE Devic 4133> Fixed Simplified Direct Access SCSI-4 device 
da0: 50.000MB/s transfers
da0: 194481MB (398297088 512 byte sectors: 255H 63S/T 24792C)
da1 at sbp0 bus 0 target 1 lun 0
da1: <Oxford S OXFORD IDE Devic 4133> Fixed Simplified Direct Access SCSI-4 device 
da1: 50.000MB/s transfers
da1: 194481MB (398297088 512 byte sectors: 255H 63S/T 24792C)
cd0 at ata0 bus 0 target 1 lun 0
cd0: <TOSHIBA DVD-ROM SD-R2002 1230> Removable CD-ROM SCSI-0 device 
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
Mounting root from ufs:/dev/ad0s3a
system power profile changed to 'performance'
    ACPI-0432: *** Error: Handler for [EmbeddedControl] returned AE_ERROR
    ACPI-1287: *** Error: Method execution failed, AE_ERROR
    ACPI-0432: *** Error: Handler for [EmbeddedControl] returned AE_ERROR
    ACPI-1287: *** Error: Method execution failed, AE_ERROR
    ACPI-1287: *** Error: Method execution failed, AE_AML_INTERNAL
    ACPI-1287: *** Error: Method execution failed, AE_AML_INTERNAL
No ocb on the queue for target 0.
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue
No ocb on the queue for target 0.
No ocb on the queue for target 0.
No ocb on the queue for target 0.
No ocb on the queue for target 0.
fwohci0: BUS reset
fwohci0: node_id = 0xc800ffc2, CYCLEMASTER mode
firewire0: 3 nodes, maxhop <= 2, cable IRM = 2 (me)
No ocb on the queue for target 0.
fwohci0: BUS reset
fwohci0: node_id = 0xc800ffc2, CYCLEMASTER mode
firewire0: 3 nodes, maxhop <= 2, cable IRM = 2 (me)
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue
sbp0:0:0 request timeout ... requeue

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