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dm raid: add write_mostly parameter

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Add the write_mostly parameter to RAID1 dm-raid tables.

This allows the user to set the WriteMostly flag on a RAID1 device that
should normally be avoided for read I/O.

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 c1084561bb
commit 46bed2b5c1
2 changed files with 28 additions and 2 deletions
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4
Documentation/device-mapper/dm-raid.txt
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@@ -50,6 +50,7 @@ The target is named "raid" and it accepts the following parameters:
[min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
[max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
[write_mostly <idx>] Drive index is write-mostly
[max_write_behind <sectors>] See '-write-behind=' (man mdadm)
[stripe_cache <sectors>] Stripe cache size (higher RAIDs only)
[region_size <sectors>]
@@ -87,9 +88,10 @@ Example tables
5 - 8:17 - 8:33 - 8:49 - 8:65 - 8:81
'dmsetup table' displays the table used to construct the mapping.
The optional parameters will always be printed in the order listed
The optional parameters are always printed in the order listed
above with "sync" or "nosync" always output ahead of the other
arguments, regardless of the order used when originally loading the table.
Arguments that can be repeated are ordered by value.
'dmsetup status' yields information on the state and health of the
array.