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тАО08-26-2007 02:49 PM
тАО08-26-2007 02:49 PM
Illegal SCSI bus phase detected on bus
Hi All,
In one of tru64 server belopw messases are being logged repeatedlt in 2-3 minutes interval in /var/adm/messages. Please suggest where the problem is ..
10:15:05 server01 vmunix: scsi11: Unable to stop SCRIPTS processor on bus 11
10:15:05 server01 vmunix: scsi11: SCSI Bus was reset
10:15:05 server01 vmunix: scsi11: Illegal SCSI bus phase detected on bus 11, resetting bus
10:15:05 server01 vmunix: scsi11: SCSI Bus was reset
10:18:39 server01 vmunix: scsi11: HTH intr. on bus 11, SBCL = 0x0
10:18:39 server01 vmunix: scsi11: SCSI Bus was reset
TIA
In one of tru64 server belopw messases are being logged repeatedlt in 2-3 minutes interval in /var/adm/messages. Please suggest where the problem is ..
10:15:05 server01 vmunix: scsi11: Unable to stop SCRIPTS processor on bus 11
10:15:05 server01 vmunix: scsi11: SCSI Bus was reset
10:15:05 server01 vmunix: scsi11: Illegal SCSI bus phase detected on bus 11, resetting bus
10:15:05 server01 vmunix: scsi11: SCSI Bus was reset
10:18:39 server01 vmunix: scsi11: HTH intr. on bus 11, SBCL = 0x0
10:18:39 server01 vmunix: scsi11: SCSI Bus was reset
TIA
3 REPLIES 3
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тАО08-26-2007 05:59 PM
тАО08-26-2007 05:59 PM
Re: Illegal SCSI bus phase detected on bus
It is hard to say what is the problem, expecially without lots of details.
It may be hardware problem, so errorlog may help.
What kind of alpha server you have and what is your OS version?
When problem started?
And first send output of:
# scu show edt
and
# hwmgr -show scsi (if you have 5.X)
It may be hardware problem, so errorlog may help.
What kind of alpha server you have and what is your OS version?
When problem started?
And first send output of:
# scu show edt
and
# hwmgr -show scsi (if you have 5.X)
In vino veritas, in VMS cluster
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тАО08-27-2007 02:11 AM
тАО08-27-2007 02:11 AM
Re: Illegal SCSI bus phase detected on bus
This means that there was a scsi bus phase issue. That is, the bus transaction didn't follow the expected protocol. Typical bus hardware transaction might be arb/select/ident followed by message out phase, etc. Something like:
Arb Start
Arb Win
Sel Start
Sel End
Msg Out
Command Write 0Ah
Msg In Save Data Pointer
Msg In Disconnect
Bus Free
If a Bus Free phase was detected instead of message-in phase when it was expected, for example, then that would be an illegal bus phase and cause the reset. Without a scsi bus trace you won't know exactly what the cause is, but it is likely either a noisy bus (any cables touched recently) or a bad device. I picked on Bus Free phase because that is typical/common. Something happens, like bus parity error detected, and the initiator controlling the bus drops the bus into Bus Free phase to terminate the transaction.
Arb Start
Arb Win
Sel Start
Sel End
Msg Out
Command Write 0Ah
Msg In Save Data Pointer
Msg In Disconnect
Bus Free
If a Bus Free phase was detected instead of message-in phase when it was expected, for example, then that would be an illegal bus phase and cause the reset. Without a scsi bus trace you won't know exactly what the cause is, but it is likely either a noisy bus (any cables touched recently) or a bad device. I picked on Bus Free phase because that is typical/common. Something happens, like bus parity error detected, and the initiator controlling the bus drops the bus into Bus Free phase to terminate the transaction.
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тАО08-27-2007 06:33 PM
тАО08-27-2007 06:33 PM
Re: Illegal SCSI bus phase detected on bus
We found from scu show edt that on bus 11, SCSI tape drive was connected and creating problem. Once removed from the server, message disappered.
Thanks to all.
Thanks to all.
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