I've floated your request to some colleagues of mine at the IBM Linux
Technology Center, and one of them sent back this reply.
>Have spent some time mulling this over with some VM sysprog
>buddies of mine we've come to the conclusion that it is not clear
>what this request is trying to achieve. It could be that we have
>not been told the real problem that needs to be solved, rather
>someone's interpretation of what the right solution out to be.
>
> .... explanation of RECOMP == recompute, which is effectively
> a way of doing the moral equivalent of resize2fs on a CMS filesystem
> to shrink it to make room for a bootstrap loader excised...
>
>Some operating systems require a full pack to be assigned to a
>minidisk i.e. 1-to-1 virtual to real. But not zLinux. The mini
>disks we define for a virtual machine can be a contiguous range of
>cyls of a real disk. The Z linux Preparation guide makes this
>clear in the example of a virtual machine directory entry (=
>definition).
>
>So he wants to resuse a CMS formatted minidisk under linux. Well
>he can do that, clearly. mke2fs will fix that for him.
>
>So does he really want a boot strap to be added to an existing
>linux disk. in which case we need an ext2resize that will make
>room for zipl to do its stuff. Or perhaps we need to tell mke2fs
>to start at some offset into the partition. But why does he want
>to change zipl as well?
>
>I can only assume the real need is to put multiple file systems
>and multiple bootstraps onto one minidisk. Maybe the need arises
>from a crude attempt to partition the CMS minidisk rather than
>define two separate disks. It doesn't seem to me to be satisfying
>a need for reuse - more a need for co-existence.
>
>Before doing anything I'd like a picture of the minidisk layout he
>is trying to achieve with some justification as to why he needs
>it this way.
I've found bug #486526, which has more context about why you're trying
to do this, but I don't have enough background in the issues of CMS,
z/VM, and s/390 shops to understand what the issues are. I vaguely
gather that you are desperately trying to avoid using ldl and cdl
minidisks, but (a) I don't know what ldl and cdl minidisks are what
the implications of such things, and (b) why you are trying to avoid
them.
Thanks, regards,
- Ted
--
To UNSUBSCRIBE, email to [EMAIL PROTECTED]
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
