One can move an SFS filepool to different disks without a regeneration; been
there, done that, more than once (from FBA to 9345, from 3380 to 9345 and
from 9345 to 3390).
But, never try it with COPYFILE: the SFS server has RESERVEd disks, such
minidisks look like one with just one file, but they are special: the
records in the fm6 file will never move: the classic CMS minidisk structures
(directory, allocation bitmap, ...) are placed in front of the minidisk,
then follow the file's data; with the DISKID function one can obtain the
block nr of the first data block).
SFS nor DB2 do use the normal CMS file APIs, but the fm6 file can be used
with the classic CMS file API too.
Now to move a minidisk to another disk-type:
- Make a new minidisk with at least as much blocks as the old one
- If you have installed the full DFSMS product (free of charge), use
DFSMS COPY fmOldDisk vdevNewDisk (RESERVED
- Without DFSMS, use these commands
-- Issue the RESERVE command to make the new minidisk RESERVED
-- ACCESS new and old minidisks
-- use FILELIST to verify that the fm6 file on the new mdisk
has as least as much records as on the old mdisk
-- copy the records one by one
PIPE < fn ft fmOldDisk |SPEC RECNO 1 1-* 11 |FILEUPDATE fn ft
fmNewDisk
SFS is very happy with the result, DB2 is not.
2009/7/30 Sterling James <ssja...@dstsystems.com>
>
> Thanks, I missed this. This method would be less disruptive.
>
>
>
> *"O'Brien, Dennis L"
> <dennis.l.o'br...@bankofamerica.com<dennis.l.o%27br...@bankofamerica.com>
> >*
> Sent by: The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU>
>
> 07/28/2009 05:36 PM
> Please respond to
> The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU>
>
> To
> IBMVM@LISTSERV.UARK.EDU cc
> Subject
> Re: SFS - Moving File Pool Minidisks to Different Physical Devices
>
>
>
>
> You can create a storage group 3, move your filespaces to it with FILESERV
> MOVEUSER, then disable storage group 2 with FILEPOOL DISABLE GROUP 2
> EXCLUSIVE DETACH. You can then replace the old storage group 2 minidisks
> with 1-cylinder minidisks. This isn’t completely transparent, because
> FILESERV is a dedicated maintenance mode command, but it does allow you to
> move users in batches, without requiring an outage long enough to back up,
> format, and restore the entire pool. I have code in the SFS server PROFILE
> EXEC to look for a move list and process it at system IPL time.
>
>
> Dennis O’Brien
>
> "That's one small step for (a) man, one giant leap for mankind". -- Neil
> Armstrong, 20 July 1969, Sea of Tranquility
>
>
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--
Kris Buelens,
IBM Belgium, VM customer support
