Re: [help]How to block new write in a "Thin Provisioning" logicalvolume manager as a virtual device driver when physical spaces run out?

[Alan Cox]

> As a result, with LVM, you can never export a "logical volume" with
> claimed storage space larger than of the underlying physical storage
> devices (e.g. SATA disks, Hardware RAID array etc.); but with ASD, you
> can export "logical volumes" which have much larger logical storage
> space.

Why do that ?

> Does anyone have some ideas for a better solution?

Take one file system such as ext3, or even a cluster file system like
GFS2 or OCFS. Create top level subdirectories in it for each machine.
Either export the subdirectory via NFS. Alternatively mount the clustered
file system somewhere on each node and then remount the subdirectory into
the right place in the file tree

(And for a clustered/shared pool root you can use pivot_root() to start
from initrd or local disk and then switch to running entirely within the
clusterfs)

Alan

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