dm raid: add region_size parameter

[pandora-kernel.git] / Documentation / device-mapper / dm-raid.txt

diff --git a/Documentation/device-mapper/dm-raid.txt b/Documentation/device-mapper/dm-raid.txt
index 4f9dd3c..be4419a 100644 (file)
--- a/Documentation/device-mapper/dm-raid.txt
+++ b/Documentation/device-mapper/dm-raid.txt
@@ -52,6 +52,10 @@ The target is named "raid" and it accepts the following parameters:
        [max_recovery_rate <kB/sec/disk>]  Throttle RAID initialization
        [max_write_behind <sectors>]       See '-write-behind=' (man mdadm)
        [stripe_cache <sectors>]           Stripe cache size (higher RAIDs only)
+       [region_size <sectors>]
+               The region_size multiplied by the number of regions is the
+               logical size of the array.  The bitmap records the device
+               synchronisation state for each region.
 
 <#raid_devs>: The number of devices composing the array.
        Each device consists of two entries.  The first is the device