ITEM: AI3047L

Problem with sysback ver 3 with a 3480 channel attached tape drives

Env: 
  AIX 325
  RISC 590
  Sysback Ver: 3.2.0.10
  Tape 3480 Channel Attached

Desc:  
  The customer is attempting to read a sysback tape using
  "List Files on volume group backup"  after "Backing up a volume
   group" and he gets the following error message:
   Error:  Unable to read the volume header on the device.
   vgrestore:  unable to read table of contents from device

Action:  I searched Austex and didn't find much.

  The 3480 tape drive cannot handle a buffer size of 64K.
  By default sysback ver 3 will use a 64k buffer size.  At
  ver 3.2 you can add a -b flag that will allow the user to
  set the buffer size in 1k values.  The 3480 can handle a 32k
  buffer size.

-b \:
  Buffer SIZE (In K-bytes): Default=64. Changing this value will either
  increase or decrease the amount of data that is written to the output
  device at one time. Some devices with small buffers may require you
  to reduce this value, while other devices with very large buffers
  can benefit from increased performance by increasing this value.
  If you are unsure, you should use the default value.

  Another problem the customer is having is that his 3480 channel
  attached tape drive is NOT showing up as a SCSI_TAPE 'm' but
  as a DD_TAPE 'M' from looking at the /usr/include/sys/devinfo.h
  file.  Sysback will make a call to devinfo to determine the
  device tape.  Sysback did not know how to control a DD_TAPE 
  device which is a mag tape drive (channel attached).  So
  it treated incorrectly.

Next Action:
  Sending 3.2.1.27 of sysback to the customer, this should fix
  the problem with the 3480 errors

That fixed the problem!!!!



Support Line: Problem with sysback ver 3 with a 3480 channel attached tape drives ITEM: AI3047L

Dated: June 1995 Category: N/A

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