ITEM: BG6324L

Can't create a fullsystem backup with 1/4" tape drive

Env:
  AIX 3.2.4
  RISC 340
  Tape 7207-011  1/4"  525mb  QIC 525
  sysback 3.2.1.31

Desc:
  Customer is getting a sbwrite error when trying to create a 
  full system backup.  sysback -f /dev/rmt0 
  sbwrite unable to write volume header 

Action:
  The block size is 0 on the tape drive.  This is the problem!!
  On 1/4" tapes, you must use a block size of 512 when writing data for 
  a fullsystem backup.
  The error is occurring on the writes for rootvg.

  Example:  If the tape drives block size is set at 0 
  The sysback command will first set the block size to 512 to write
  the first 4 boot images, then set the block size to 0 and rewind
  and fast forward 4 file marks and try writing the rootvg data.  
  The 1/4" will not support this.  You must have the block size set
  to 512.  Having the bs=512 will keep the tape drive from having to
  rewind and fastward to start the write for rootvg.

Next Action:
  Closing with customer approval



Support Line: Can't create a fullsystem backup with 1/4" tape drive ITEM: BG6324L

Dated: March 1996 Category: N/A

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