Commit cb824724 authored by Matthew Sakai's avatar Matthew Sakai Committed by Mike Snitzer
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dm vdo: document minimum metadata size requirements 



Signed-off-by: default avatarMatthew Sakai <msakai@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
parent 2a7f925b

Documentation/admin-guide/device-mapper/vdo.rst

+11 −0
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@@ -34,6 +34,17 @@ The repo also contains additional userspace tools which can be used to 
inspect a vdo target's on-disk metadata. Fortunately, these tools are

rarely needed except by dm-vdo developers.



Metadata requirements

=====================



Each vdo volume reserves 3GB of space for metadata, or more depending on

its configuration. It is helpful to check that the space saved by

deduplication and compression is not cancelled out by the metadata

requirements. An estimation of the space saved for a specific dataset can

be computed with the vdo estimator tool, which is available at:



https://github.com/dm-vdo/vdoestimator/



Target interface

================