Fred Schmidt pisze:
Hi folks,
We are in the process of migrating from 3590 to 3592 tape. We would like to use
HSM's Tape Mount Management (TMM) to stack data on the new tapes, thus taking
advantage of their much greater capacity.
However, much of the data we have on 3590 tape currently is backups in DFDSS
DUMP format with a blocksize of 229360 (LBI). The fine DFDSS manual says that
COPYDUMP is the only supported method for copying DUMP datasets, and that it
cannot be used to change the blocksize of the DUMP dataset. This means that we
cannot copy this data from tape to DASD as it does not support block sizes
larger than 32760. Therefore we cannot copy it to TMM.
I have considered restoring the datasets in these dumps and then re-dumping
them to TMM. However, since the datasets in the dumps largely still exist, they
would have to be restored to a non-SMS volume as uncataloged datasets. Given
that we have some 22,000 datasets on tape and a lot of them are DFDSS DUMP's,
that is starting to look very ugly.
So, does anybody have a more practical approach?
The most practical approach: use proper tools. HSM (of FDR/ABR) backups
could be easily RECYCLEd, not to mention ease of backup process.
Of course HMS should be implemented in advance, so this is not an advice
for this case.
For this case I would suggest two approaches:
1. WAIT. Start using new tapes for new backups and wait - old backups
will expire. he longer you wait the more backups expire.
2. Remaining dumps (or everything if you don't want to wait) can be
COPYDUMPed without affecting BLKSIZE or restored on dasd with RENAME.
The last option involve manual process of changing names, at least at
HLQ level, but "manual" (non-HSM) backups do require such knowledge.
BTW: Are you sure the blocksize on 3590 is 229360?
The largest blocksize available on Jaguar is 256kB.
BLKSIZE LIMIT (forgot the keyword) can be up to 2GB, but it is
theoretical (system software) limit. SCSI reference of Jaguar specifies
that blocksize can be up to 2MB.
So, if your blocsize is really 229360, then you don't need to reblock
the dumps!
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
ul. Senatorska 18
00-950 Warszawa
www.brebank.pl
Sd Rejonowy dla m. st. Warszawy
XII Wydzia Gospodarczy Krajowego Rejestru Sdowego,
nr rejestru przedsibiorców KRS 0000025237
NIP: 526-021-50-88
Wedug stanu na dzie 16.07.2010 r. kapita zakadowy BRE Banku SA (w caoci wpacony) wynosi 168.248.328 zotych.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
