H125499:  3518 STORAGE ENCLOSURE: SYNCHRONIZATION MAY FAIL W/ 2.25   GB


 SYMPTOM:

 "Check Consistency" errors during synchronization of RAID 5
 Logical drives, or Defunct (DDD) drives with any RAID level may
 be experienced.

 PROBLEM ISOLATION AIDS:

 All of the following must be true for this Tip to apply:

 - There are more than 6 x 2.25GB Hard Drives FRU p/n76H0958
   (Option p/n's 07H0387 / 94G2650 / 70G9862) in a IBM 3518
   External Storage Enclosure.with daisey-chained backplanes

 - The backplane (s) that these drives are connected to are
   daisey-chained.
 - The 3518 is attached to any RAID / ServeRAID / ServeRAID II
   Adapter / Controller in a IBM PC Server / Netfinity server.

 FIX:

 Connect each populated Backplane in the 3518 to a separate
 SCSI Channel.

 Refer to RETAIN TIP Record# H133777 for additional info on
 backplane jumper settings.


 Date: January 7, 1998