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SubjectRe: Volume Managers in Linux
   From: BERNARD Sebastien <sebastien.bernard@cegetel.fr>
Date: Wed, 4 Nov 1998 14:34:59 +0100

One solution to cope with such problem without touching the ext2
code is to make the block number of one partition not adjacent to the
other.

You can't just do this without touching the ext2 code because the ext2
code (like most filesystems that don't explicitly support multiple
filesystems) assume that the block numbering is contiguous.

The other problem with simply divvying up the block number space is that
you will have fragmentation issues. The plan which I have is when we
revise the way block address get stored to support B-tree extent maps,
that we leave room for a 8-byte block address. 4-bytes for the block
number, 2-bytes for the volume/slice number, and 2-bytes reserved for
future use. This gets around the fragmentation problem by expanding the
address space.

- Ted

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