Adaptec 412R User Guide - Page 88
Symptom, Probable Cause, Solution, I/O card JBOD or
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DuraStor 412R/6320SS/7320SS Installation and User's Guide Symptom SCSI Bus hangs, SCSI Bus excessively retries, and/or drives drop offline. Probable Cause I Faulty connectivity. I Faulty SAF-TE disk I/O card (JBOD or daisy- chained enclosure) or host I/O card. Solution I Re-check the cable connections to the SAF-TE disk I/O card and/or host disk I/O card. I If you have daisychained storage subsystems connected on the SCSI bus, you need to perform some fault isolation. I If all the disk drives on one bus are offline, start with the daisy-chain storage subsystem. Disconnect the data cable. If the remaining disk drives return to a normal state, it indicates that the isolated storage subsystem has the faulty component. I If this does not return the remaining drives to a normal state, it is a good indication that the problem is in the first storage subsystem and/or its SAF-TE disk I/O card. I You may use the SAF-TE disk I/O card from the other storage subsystem or a new, known good card. Substitute this card for the suspect card and it should return the storage subsystem bus to a normal condition. 6-4