Commit 28d627fb authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] update Documentation/md.txt

From: <spam@altium.nl> (Dick Streefland)

The following patch documents the currently undocumented raid= kernel
parameter.
parent 9828805c
...@@ -2,6 +2,8 @@ Tools that manage md devices can be found at ...@@ -2,6 +2,8 @@ Tools that manage md devices can be found at
http://www.<country>.kernel.org/pub/linux/utils/raid/.... http://www.<country>.kernel.org/pub/linux/utils/raid/....
Boot time assembly of RAID arrays
---------------------------------
You can boot with your md device with the following kernel command You can boot with your md device with the following kernel command
lines: lines:
...@@ -11,6 +13,8 @@ for old raid arrays without persistent superblocks: ...@@ -11,6 +13,8 @@ for old raid arrays without persistent superblocks:
for raid arrays with persistent superblocks for raid arrays with persistent superblocks
md=<md device no.>,dev0,dev1,...,devn md=<md device no.>,dev0,dev1,...,devn
or, to assemble a partitionable array:
md=d<md device no.>,dev0,dev1,...,devn
md device no. = the number of the md device ... md device no. = the number of the md device ...
0 means md0, 0 means md0,
...@@ -34,7 +38,22 @@ A possible loadlin line (Harald Hoyer <HarryH@Royal.Net>) looks like this: ...@@ -34,7 +38,22 @@ A possible loadlin line (Harald Hoyer <HarryH@Royal.Net>) looks like this:
e:\loadlin\loadlin e:\zimage root=/dev/md0 md=0,0,4,0,/dev/hdb2,/dev/hdc3 ro e:\loadlin\loadlin e:\zimage root=/dev/md0 md=0,0,4,0,/dev/hdb2,/dev/hdc3 ro
-------------------------------
Boot time autodetection of RAID arrays
--------------------------------------
When md is compiled into the kernel (not as module), partitions of
type 0xfd are scanned and automatically assembled into RAID arrays.
This autodetection may be suppressed with the kernel parameter
"raid=noautodetect".
The kernel parameter "raid=partitionable" (or "raid=part") means
that all auto-detected arrays are assembled as partitionable.
Superblock formats
------------------
The md driver can support a variety of different superblock formats. The md driver can support a variety of different superblock formats.
(It doesn't yet, but it can) (It doesn't yet, but it can)
...@@ -82,7 +101,7 @@ array using HOT_REMOVE_DISK. ...@@ -82,7 +101,7 @@ array using HOT_REMOVE_DISK.
Specific Rules that apply to format-0 super block arrays, and Specific Rules that apply to format-0 super block arrays, and
arrays with no superblock (non-presistant). arrays with no superblock (non-persistant).
------------------------------------------------------------- -------------------------------------------------------------
An array can be 'created' by describing the array (level, chunksize An array can be 'created' by describing the array (level, chunksize
......
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