Perhaps the author ("used to work for STK and Sun") was referring to STK
Redwood.
The first true "Write-once-read-never" tape media !!! aka Deadwood. :-)
Many years ago I inherited an environment that was using Redwood for HSM
migration and backup.
We had failures to such an extent that I wrote a program to recreate
migration data from backup in the event of a failed mig tape and to
recall and create new backups in the event of a failed backup tape.
Program would read the necessary CDS records and sort them based on the
tape volume and the datasets position on the tape (to reduce rewind time
etc.)
Regards,
Chris
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On
Behalf Of Pinnacle
Sent: Wednesday, 24 March 2010 9:29 AM
To: IBM-MAIN@bama.ua.edu
Subject: Mainframe Executive article on the death of tape
Anybody read the Mainframe Executive article on the death of tape as a
backup media? The guy writing it used to work for STK and Sun, and now
works for disk-based backup vendors. He says the following:
- 15% of all backups fail (my experience < 1%)
- 10-50% of all restores from tape fail (my experience <1%)
- 40-50% failure when restoring data from tape > 5 years (my experience
again is <1%)
So what are you guys seeing out there? Do we really have mainframe tape
failure rates in the double-digits percentwise? If we do, then the guy
is
right and tape is dead, but I just don't buy those figures. What say
you?
Regards,
Tom Conley
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