dm cache: document metadata device is exclussive to a cache
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>
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@ -50,7 +50,8 @@ other parameters detailed later):
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which are dirty, and extra hints for use by the policy object.
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This information could be put on the cache device, but having it
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separate allows the volume manager to configure it differently,
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e.g. as a mirror for extra robustness.
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e.g. as a mirror for extra robustness. This metadata device may only
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be used by a single cache device.
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Fixed block size
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