Messages in this thread | | | Date | Thu, 21 Nov 2002 16:55:09 -0500 | From | Doug Ledford <> | Subject | Re: RFC - new raid superblock layout for md driver |
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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 <dledford@redhat.com> 919-754-3700 x44233 Red Hat, Inc. 1801 Varsity Dr. Raleigh, NC 27606
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