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authorNeilBrown <neilb@suse.de>2006-01-06 11:21:36 +0300
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 19:34:10 +0300
commit88202a0c84e1951d6630d1d557d4801a8cc5b5ef (patch)
tree5a1aadc008de1ee68f40a4bb667157f248211230 /Documentation/md.txt
parent6d7ff7380b2e28c2807da3bf9fa614d91d15bacf (diff)
downloadlinux-88202a0c84e1951d6630d1d557d4801a8cc5b5ef.tar.xz
[PATCH] md: allow sync-speed to be controlled per-device
Also export current (average) speed and status in 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 b8d172b254f7..03a13c462cf2 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -207,6 +207,28 @@ All md devices contain:
available. It will then appear at md/dev-XXX (depending on the
name of the device) and further configuration is then possible.
+ sync_speed_min
+ sync_speed_max
+ This are similar to /proc/sys/dev/raid/speed_limit_{min,max}
+ however they only apply to the particular array.
+ If no value has been written to these, of if the word 'system'
+ is written, then the system-wide value is used. If a value,
+ in kibibytes-per-second is written, then it is used.
+ When the files are read, they show the currently active value
+ followed by "(local)" or "(system)" depending on whether it is
+ a locally set or system-wide value.
+
+ sync_completed
+ This shows the number of sectors that have been completed of
+ whatever the current sync_action is, followed by the number of
+ sectors in total that could need to be processed. The two
+ numbers are separated by a '/' thus effectively showing one
+ value, a fraction of the process that is complete.
+
+ sync_speed
+ This shows the current actual speed, in K/sec, of the current
+ sync_action. It is averaged over the last 30 seconds.
+
As component devices are added to an md array, they appear in the 'md'
directory as new directories named