Neil Brown wrote:
???
(reads original description in more detail).
So... the filesystem images are identical in both copies, and the
"interesting" bit is that the image is just a file on some filesystem.
So could I implement your idea by:
dd if=/dev/zero of=/1/bigfile count=lotsandlots
dd if=/dev/zero of=/2/bigfile count=lotsandlots
losetup /dev/loop1 /1/bigfile
losetup /dev/loop2 /2/bigfile
mdadm -C /dev/md0 --level=raid1 --raid-disks=2 /dev/loop1 /dev/loop2
mkfs /dev/md0
mount /dev/md2 /space
??
Why would you bother? Well, I do it a lot of code testing, but I
would be hard pressed to make a case for that sort of config in
production.
Thanks for the brief howto there. I'll install the mdadm suite and
experiment. It seems like a userspace driver?
You said:
1) the disks need
not be the same size or from the same manufacturer; 2) the supporting code
would be cross-platform.
md/raid already works happily with different sized drives from
different manufacturers (for raid1, it only uses as much space as the smaller
drive provides, For raid0 it uses it all).
I don't know what you mean by '2'.
2 meant in the way that a driver for a PC raid card is not much use on
a Sparc.
So I still cannot see anything particularly new. What am I missing?
I think it's what I missed. Thanks for the heads-up. If the above is
a good technique it could suit me well.
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