On Thursday 01 June 2006 16:45, McKown, John wrote:
>Please be kind. I don't have a z/Linux system around. But I know that
>you cannot share a filesystem between two z/Linux instances in
>read/write mode and hope to keep a usable filesystem (in the general
>case). I wonder why the dasd driver cannot (or does it?) implement an
>"ioctl" or some interface which the mount command could use to do a
>device reserve against the dasd device when mounted in read/write mode
>(or make it optional). Does anybody "partition" a 3390 into multiple
>filesystems, then use those filesystems on different z/Linux instances?
Yeah, my Provisioning Expert does that all the time. It builds Linux
filesystems of specific sizes within DASD extents, so if I need a few 100MB
filesystems I can have them all on the same 3390.
There's no reason I know of to have a one-to-one mapping between DASD devices
and Linux filesystems, especially if you're trying to conserve DASD by
allocating only what you really need to an instance. You'd have to create
such a constraint in order to use the device reserve feature, though. What
are you trying to accomplish with this? I'm not getting what you're trying
to do.
- MacK.
-----
Edmund R. MacKenty
Software Architect
Rocket Software, Inc.
Newton, MA USA
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