6.1 Freezes - Suspect SCSI Issue

Jeff Royle lists at qwirky.net
Wed Jan 10 21:36:01 UTC 2007

Andrea Venturoli wrote:
> Juergen Heberling wrote:
>> Hi all
>> Please suggest some way of diagnosing this problem:
>> System freezes after being up in production and apparently stable for 
>> several weeks, no dump, no error message, nothing on the console - so 
>> I suspect hardware.
>  > ...
>> Here is my dmesg, long lines were wrapped:
>> ...
>> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
>>  cpu0 (BSP): APIC ID:  0
>>  cpu1 (AP): APIC ID:  1
>>  cpu2 (AP): APIC ID:  6
>>  cpu3 (AP): APIC ID:  7
>> ...
>> ahd0: <Adaptec AIC7902 Ultra320 SCSI adapter> port 
>> 0x2400-0x24ff,0x2000-0x20ff
>>         mem 0xdd200000-0xdd201fff irq 32 at device 2.0 on pci3
>> ahd0: [GIANT-LOCKED]
>> aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs
>> ahd1: <Adaptec AIC7902 Ultra320 SCSI adapter> port 
>> 0x2c00-0x2cff,0x2800-0x28ff
>>         mem 0xdd202000-0xdd203fff irq 33 at device 2.1 on pci3
>> ahd1: [GIANT-LOCKED]
>> aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs
> I've had freezes as you describe on two different servers with ahd and 
> SMP. The solution was to turn SMP off, unfortunately :(
>  bye
>     av.
> _______________________________________________

Are these Xeon's?  If so you might want to try disabling Hyper-threading 
in the bios.   I have noticed some strange behavior on 6.2-RC1 with a 
IBM x336 server here.  It never crashed but the throughput "felt" off, 
so I disabled Hyper-threading and things seemed to perform the way I 
expected it to should.

I would have more details when I actually have time to work on the 
server itself, however in the meantime give it a shot.   If you have 2 
CPU's you shouldn't see the CPU2/CPU3 listed just the 2 aftewards.

FYI - I have used that particular controller successfully on several 
servers recently so I don't think that should be a overall issue for you.



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