Messages in this thread | | | Subject | Re: Volume Managers in Linux | From | Andi Kleen <> | Date | 04 Nov 1998 18:43:20 +0100 |
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In article <19981103214553.D12914@nodonn.cloud9.co.uk>, James Fidell <james@cloud9.co.uk> writes: > Quoting Theodore Y. Ts'o (tytso@MIT.EDU): >> I've never claimed that the ext2 is the best way to do RAID; I think MD >> is the way to do that. However, allowing ext2 to be able to support >> filesystems which span multiple block devices is a good thing to do, and >> a cleaner way of supporting multivolume support. Examples of >> filesystems which do this include the UDF filesystem used by DVD-ROM's, >> and Digital Unix's Advanced Filesystem.
> What "feels wrong" about this to me is that all fs implementations are > then required to implement multiple device spanning, or they can't be > used on spanning partitions at all.
Linux already has MD which does RAID 0 (= device spanning) just fine for all filesystems who want it. Now the big problem is to allow shrinking/increasing such bundles without recreating the file system - only the file system itself knows enough about its structure to offer this service, no generic layer can provide that.
-Andi
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