Troubleshooting

 

 

 

SCSI Bus Symptom

Probable Cause

Solution

 

 

 

 

 

 

SCSI Bus hangs, SCSI

Faulty connectivity.

Re-check the cables to the I/O

Bus excessive retries,

 

Interface card and host adapter.

and/or drives drop

 

 

offline.

Faulty I/O Interface card.

Depending on how many

 

 

subsystem are connected on the

 

 

SCSI bus, you will need to

 

 

perform some fault isolation.

 

 

If all the drives on one bus are

 

 

offline, start with the subsystem

 

 

furthermost out on the chain.

 

 

Disconnect the data cable. If the

 

 

remaining drives return to a

 

 

normal state it indicates that

 

 

the isolated subsystem has the

 

 

faulty component.

 

 

If this does not return the

 

 

remaining drives to a normal

 

 

state, continue removing each

 

 

data cable on that bus until the

 

 

first subsystem is the remaining

 

 

subsystem.

 

 

If you had to remove all the data

 

 

cables up to the first subsystem

 

 

and the problem is still not

 

 

resolved, this could indicate

 

 

that the I/O Interface card in

 

 

the first subsystem is the

 

 

suspect faulty card. Use one of

 

 

the cards from the previous

 

 

subsystems or a “new” known

 

 

good card. This should return

 

 

the subsystem bus to a normal

 

 

condition.

 

 

Note: A return to a normal

 

 

condition is indicated by the

 

 

drives coming back online.

 

 

After the faulty card is

 

 

replaced, begin re-connecting

 

 

the data cables on the

 

 

remaining I/O Interface cards

 

 

noting the bus remains in a

 

 

normal state.

 

 

 

Common SCSI Bus Problems

55

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NStor Technologies Disk Array Enclosure, CR8e manual Scsi Bus Symptom Probable Cause Solution
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