ahd0: Invalid Sequencer interrupt occurred.

[Amit Rao]

Ade Lovett wrote:
> 
> On Nov 10, 2005, at 05:30 , Ricardo A. Reis wrote:
> 
> Reducing the problem to the relevant pieces:
> 
>> 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
> 
> [...]
> 
>> da0 at ahd0 bus 0 target 0 lun 0
>> da0: <SEAGATE ST373307LC 0006> Fixed Direct Access SCSI-3 device
>> da0: 320.000MB/s transfers (160.000MHz, offset 63, 16bit), Tagged 
>> Queueing Enabled
>> da0: 70007MB (143374744 512 byte sectors: 255H 63S/T 8924C)
>> da1 at ahd0 bus 0 target 1 lun 0
>> da1: <SEAGATE ST373307LC 0006> Fixed Direct Access SCSI-3 device
>> da1: 320.000MB/s transfers (160.000MHz, offset 63, 16bit), Tagged 
>> Queueing Enabled
>> da1: 70007MB (143374744 512 byte sectors: 255H 63S/T 8924C)
>> Trying to mount root from ufs:/dev/da0s1a
> 
> Adaptec HBAs and Seagate drives have a long and intensely painful 
> history of not working well together.  Adaptec blames Seagate.  Seagate 
> blames Adaptec.  Throw in the myriad of subtly different AIC controllers 
> that are commonplace on 1U and 2U rackmount servers, and things get even 
> more entertaining.
> 
> You essentially have 3 options

4 options.

0) Upgrade to Seagate 10K.7 drive firmware level 0008. That seems to 
help. One "ahd sequencer error" message still appears at boot, but after 
that it seems to work (with your fingers crossed).

-Amit

> 
> 1) replace the HBA -- somewhat difficult to do if it's embedded and you 
> need the PCIX slots for something else.
> 
> 2) replace the drives -- IBM/Hitachi are fine choices here.  Make sure 
> to tell whomever you purchase systems from that you'll not accept 
> Seagate drives in the future.
> 
> 3) inside the adaptec bios, drop the drives to U160 speed, making sure 
> that *both* packetizing *and* QAS are turned OFF.  You'll lose a little 
> bit of performance (but not all that much, Seagate drives really are 
> garbage), and get some semblance of stability.
> 
> -aDe
> 
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