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authorNeilBrown <neilb@suse.de>2006-01-06 00:20:49 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:34:08 -0800
commita35b0d695d44410eb1734c9abb632725a3138628 (patch)
tree0da4a3ba93cf8a1fd2b4dcad3dd251def752942d /Documentation/md.txt
parent3b34380ae8c5df6debd85183c7fa1ac05f79b7d2 (diff)
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[PATCH] md: allow md array component size to be accessed and set via sysfs
Signed-off-by: Neil Brown <neilb@suse.de> Acked-by: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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diff --git a/Documentation/md.txt b/Documentation/md.txt
index 9710138d101a..0a2e10a4040d 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -174,6 +174,15 @@ All md devices contain:
The size should be atleast PAGE_SIZE (4k) and should be a power
of 2. This can only be set while assembling an array
+ component_size
+ For arrays with data redundancy (i.e. not raid0, linear, faulty,
+ multipath), all components must be the same size - or at least
+ there must a size that they all provide space for. This is a key
+ part or the geometry of the array. It is measured in sectors
+ and can be read from here. Writing to this value may resize
+ the array if the personality supports it (raid1, raid5, raid6),
+ and if the component drives are large enough.
+
As component devices are added to an md array, they appear in the 'md'
directory as new directories named
dev-XXX