Conference turris::digital_unix

8838.0. "Help on TLZ07 and lost database!!" by BPSOF::POLGAR () Fri Feb 14 1997 14:51

Hello,

We need urgent help!

Our customer is in a desparate situation. Just before closing their
financial year they lost all their database.

They were running OSF/1 V2.0B on an AS2000 4/200. The file domain
containing their usr filesystem and SAP and ORACLE database broke
due to a disk error; I had to re-install O/S and SAP.
The problem came when we tried to restore database from a TLZ07 tape.
(They had made full database backup every day - backup script had always ran OK.)
TLZ07 was unable to read any tapes had been written by itself; it produced
"Nonrecoverable Hardware Error" with sense key x04, ASC x44, ASQ x80.
I tried to read it by other drives, without success. I tried to write
some data onto brand new tapes and read it by the broken drive - I got the 
same error.
The other interesting thing is that tape drive was swapped last November;
I was unable to read a tape written before that, in October!

Now customer's only hope is that we will "do something" on the issue or they
will lose one year's work.

My questions:

- what do these ASC/ASQ figures mean?
- is there any place in magtape engineering where tapes could be
  thoroughly checked to - hopefully - restore data?
- I know this is an old and unsupported configuration. Anyway, is there
  any known problem between OSF/1 V2.0B SCSI driver and TLZ07 that could
  cause such data corruption on tape?
- Any ideas, please?...


Thanks in advance,

Imre POLGAR
MCS Hungary

I'll post this in MAGTAPE, too.

The ASC of 44 is an internal target failure.
The ASQ is vendor unique so I can't help with that.

Does this error happen at the beginning of tape or is it
somewhere after BOM.   I suggest replacing that tape unit.

Thanks
[Posted by WWW Notes gateway]