In an SMS shop, whether or not there is an DFHSM backup of any dataset
is totally dependent on whether the assigned MGMTCLAS class calls for
auto-backup. In many applications where the backups of many different
datasets are required to be synchronized in some fashion, we have found
DFHSM asynchronous auto-backup to be almost useless, so we tend to have
more datasets defined without DFHSM auto-backup than with.
"Amen" to necessity of duplexing with all DFHSM tapes. All it takes is
one instance like this with the loss of thousands of datasets to prove
to management that the cost of duplexing is justified, and there is no
way other than true duplexing to protect against this kind of loss -
TAPECOPY after the fact doesn't cover all failures, so it is also
important that customization requires a failure writing a duplex volume
to mark the primary tape full rather than continuing with no active
alternate copy.
Even with 3490 carts, the potential loss of hundreds of datasets from a
single damaged cartridge could be serious, but the 30-fold+ increased
capacity of later technology tapes makes each single tape so important
that duplexing of both ML2 and Backup tapes should be mandatory!
JC Ewing
Ulrich Krueger wrote:
For each dataset on ML2 tape, there is supposed to be a copy on DFHSM backup
tape. You'll have to identify each "lost" dataset and recover them from
DFHSM backup tape, one at a time.
And if you haven't turned on duplexing for ML2 tapes yet and begun to create
copies of all your ML2 tapes ... the next disaster is just waiting to
happen. Murphy's watching ...
Regards,
Ulrich Krueger
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of ROHIT
Sent: Tuesday, August 04, 2009 12:11
To: [email protected]
Subject: HSM ML2 without Label and NO duplex Copy
Hell Guys ,
We unfortunatley ended up having a 3590 ML2 tape which is giving NO LABEL
error and 6000 datasets sitting on it are unreadable, tape ops confirmed
that its not being identified by the drives .
IOS000I 6503,B3,IOE,02,0600,,**,,DFHSM 468
004914D050205451 0202FF1400003037 0000000000000190 41042300BEFD1312
UNSUPPORTED FORMAT
IEC512I I/O ERR 6503, ,NL,DFHSM,DFHSM,DFHSM.HMIGTAPE.DATASET
IEC502E R 6503,, ,NL,DFHSM,DFHSM
IEC501A M 6503,H00033,SL,,DFHSM,DFHSM,DFHSM.HMIGTAPE.DATASET
Tried recycling but again not helping because its not getting identified by
system.
Can any one advise how to define a new label or any other resoultion ,
appreciate your input .
Thanks in Advance ,
Rohit
IBM
...
--
Joel C. Ewing, Fort Smith, AR [email protected]
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