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dm raid: add region_size parameter

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Allow the user to specify the region_size.

Ensures that the supplied value meets md's constraints, viz. the number of
regions does not exceed 2^21.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Jonathan Brassow
2011-08-02 12:32:07 +01:00
committed by Alasdair G Kergon
parent c0a2fa1ef1
commit c1084561bb
2 changed files with 83 additions and 3 deletions
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4
Documentation/device-mapper/dm-raid.txt
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@@ -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