Messages in this thread | | | From | Neil Brown <> | Date | Sun, 7 Mar 2004 15:30:58 +1100 | Subject | Re: Advanced storage management ( suggestion ) |
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On Saturday March 6, mfedyk@matchmail.com wrote: > > > 2- Support for multi-disk/multi-host storage pool. > > You're mixing layers here. MD and DM already work in this area. >
I would probably disagree here. I think it makes much more sense for a filesystem to know about multiple devices than for MD or DM to combine a bunch of devices into the illusion of one big device, only to have the filesystem chop that big device into little files....
(Note that I wouldn't expect a filesystem to include raid5 style behaviour, and probably wouldn't expect raid1 like behaviour, but having the filesystem do striping and inter-device migration itself seems eminently sensible.)
However I don't see much value if the suggestion of a new layer that provide lots of services of filesystems. I strongly suspect that no filesystem would want to use them. Look at "jdb". It is designed to provide a journalling layer for any filesystem, but how many filesystems use it? Just one - ext3 - the one it was designed for.
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