TECHNICAL BULLETIN
                               Bulletin 1-276

Date:  September 28, 1990

Mirroring Upgrade from NetWare v2.15 Rev. A to v2.15 Rev. C

     Several NetWare 286 v2.15 Rev. A disk mirroring limitations were 
     addressed in v2.15 Rev. C (See Technical Bulletin 1-254).  Some of 
     these limitations occur with the use of disk drives larger than 255MB;
     NetWare 286 v2.15 did not fully support mirroring large drives until 
     Revision C.  In cases where large mirrored drives experienced a 
     failure or shutdown under v2.15 Rev. A and were subsequently 
     remirrored, data corruption may have been introduced by the system.  
     Normally, remirroring the disk drives after upgrading to v2.15 Rev. C 
     will resolve this corruption.  In remote cases, data corruption may 
     have been introduced on the primary drive.  In these extreme 
     circumstances, it is advised that the disk drives be reinitialized 
     and the data be restored from a reliable backup.