On Wed, 18 Jul 2007, Srinivasa R Chamarthy wrote:
> Can you let me know what is your /etc/zipl.conf ? And also let me know if
> you are using a CMS formatted disk. If it is a CMS formatted disk then you
> can not put swap to it. and also give me the output for lsdasd. It would
> help me in debugging.
Not exactly.
Just for clarification,
CMS FORMAT does two things: low-level format (akin to 'dasdfmt')
and high-level format (akin to 'mke2fs'). If the disk is FBA or VDSK
then CMS FORMAT silently skips the low-level formatting operation.
In general, FBA and VDSK should be usable immediately
without CMS FORMAT (and without 'dasdfmt'). You can simply 'mkswap'
or 'mke2fs' and use the whole disk. If you need partitioning,
the story changes. And if you use 'dasdfmt -l cdl' the waters
get even murkier w/r/t using "the whole disk".
But the low-level half of the CMS FORMAT operation is essential
prior to using CKD disks, unless one runs 'dasdfmt' in Linux.
*** summary ***
CKD or ECKD -- require low-level formatting
FBA, VDSK, SAN -- do not require low-level formatting
CMS FORMAT -- performs low-level and high-level formatting
'mkswap' -- performs high-level formatting for swap space and
can be run even if the disk was CMS FORMATted
'mke2fs' -- performs high-level formatting for a filesystem and
can be run even if the disk was CMS FORMATted
Partitioning schemes may throw-off the latter two.
-- R;
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