lkml.org 
[lkml]   [2002]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: RFC - new raid superblock layout for md driver
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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:31    [W:0.083 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site