On Thu, Nov 21, 2002 at 02:53:23PM -0600, Kevin Corry wrote:

LVM doesn't handle the filesystem resizing, the filesystem tools do. The only 
thing you need is something in user-space to ensure the correct ordering. For 
an expand, the MD device must be expanded first. When that is complete, 
resizefs is called to expand the filesystem.

MD currently doesn't allow resize of RAID 0, 4 or 5, because expanding 
striped devices is way ugly.

MD doesn't, raidreconf does but not online.

If it was determined to be possible, the MD 
driver may need additional support to allow online resize.

Yes, it would.  It's not impossible, just difficult.

But it is just as 
easy to add this support to MD rather than have to merge MD and DM.

Well, merging the two would actually be rather a simple task I think since 
you would still keep each md mode a separate module, the only difference 
might be some inter-communication call backs between LVM and MD, but even 
those aren't necessarily required.  The prime benefit I would see from 
making the two into one is being able to integrate all the disparate 
superblocks into a single superblock format that helps to avoid any 
possible startup errors between the different logical mapping levels.

-- 
  Doug Ledford [off-list ref]     919-754-3700 x44233
         Red Hat, Inc. 
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