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dm cache: document metadata device is exclussive to a cache

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A cache's metadata device may not be shared by multiple cache devices.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
This commit is contained in:
Mike Snitzer 2013-08-16 10:54:20 -04:00
parent 670368a8dd
commit 66bb2644ca
1 changed files with 2 additions and 1 deletions
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3
Documentation/device-mapper/cache.txt
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@ -50,7 +50,8 @@ other parameters detailed later):
which are dirty, and extra hints for use by the policy object.
This information could be put on the cache device, but having it
separate allows the volume manager to configure it differently,
e.g. as a mirror for extra robustness.
e.g. as a mirror for extra robustness. This metadata device may only
be used by a single cache device.
Fixed block size
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