🚀 go-pugleaf

We are evaluating an IBM 3490E C22 cartridge unit, but some problem
arise when using VMBACKUP at level 5.3A.
Our configuration is as follow :
  VM/SP Release 5.0 at put 9002
  IBM 4341-2
  3490E channel attached to the 4341 in a 2 Mbps channel
The 3490 is defined as a 3480 unit to VM without any feature.

The problem is :

  When VmBackup is ready to go to next cartirdge in an full backup job
(not a physical one) we get an unrecoverable I/O error with message
VMBTMP540E UNRECOVERABLE ERROR OCCURRED WRITING A DATA BLOCK
and the the unit is detached.

The EREP report indicate a fault symptom code 4411 and the description of it
is as follow : A Read Backward command has been issued for a record in 3490E
Extended Format. A unit Check, which impacts performance, is given the first
time a Read Backward command is issued. The Unit Check is only given once per
tape mount.

The questions are :
 Does somebody else experimented this symptom before ?
 Is the IDRC feature involved in this ? It must be active or inactive in the
 unit ?
 Can it be a VMBACKUP release level problem ?
 What is record in 3490E Extended Format ?

Thanks in advance.

Juan Carlos Duran
Empresa Nacional del Petroleo
Santiago - Chile