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Billi
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Joined: 29 Jun 2010
Posts: 9
Location: tel-aviv
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we want to convert disks from 3390 Model-3 to 3390 Model-9. We're using the Blksize as defined in device 8392. Will this still be valid for new disks?
Does we have to reformat, etc? |
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Bill Dennis
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Joined: 17 Aug 2007
Posts: 562
Location: Iowa, USA
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| These device numbers are unknown to me. Do you mean 3390 Model-3 and Model-9? Please give more information. |
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Billi
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Joined: 29 Jun 2010
Posts: 9
Location: tel-aviv
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| yes , I mean 3390-3 and 3390-9 |
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Bill Dennis
Active Member
Joined: 17 Aug 2007
Posts: 562
Location: Iowa, USA
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The track geometry on a MOD-3 and MOD-9 is exactly the same, there are just more tracks per volume. Use the same blocksizes as before.
Or are you saying you want to reconfigure an existing virtual storage array from MOD-3 to MOD-9 volume sizes?
PS. Is 8392 a blocksize or another device type?
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Billi
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Joined: 29 Jun 2010
Posts: 9
Location: tel-aviv
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| The 8392 is a virtual device type used |
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expat
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Joined: 14 Mar 2007
Posts: 8797
Location: Welsh Wales
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I would just specify the RECFM and LRECL in the JCL and let the OS determine the optimum BLKSIZE.
I also recall that you can reblock datasets copying with DFdss. |
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Pete Wilson
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Joined: 31 Dec 2009
Posts: 582
Location: London
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Expat- you're right, DFDSS will automatically reblock datasets it moves if the reblock flag is on in their VTOC entry. Otherwise you can force it by specifying REBLOCK on the COPy command. There are some exceptions, and you might be a bit wary of doing it for PDS/PDSE's which sometimes have BLKSIZE restriction:
The REBLOCK keyword is ignored for:
o Unmovable data sets
o Data sets with record format of U (except for partitioned load
modules)
o Data sets with a record format of V, VS, VBS, or F
o Partitioned data sets with note lists (except for partitioned load
modules)
o Partitioned data sets that are also specified in the NOPACKING keyword
Suggest you move to using Dataclas more and eliminate as much DCB and SPACE coding from the JCL as you can so future migrations will be simplified.
If you have TDMF you can go from Mod-3's to Mod-9's without an outage, but you have to run REFVTOC on the new target volumes later to resize the VTOC's |
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