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vdo: update info about memory
Add more info about kernel target memory allocation associated with VDO pool usage.
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@ -12,7 +12,7 @@ for primary storage.
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.P
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Deduplication is a technique for reducing the consumption of storage
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resources by eliminating multiple copies of duplicate blocks. Compression
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takes the individual unique blocks and shrinks them.
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takes the individual unique blocks and shrinks them.
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These reduced blocks are then efficiently packed together into
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physical blocks. Thin provisioning manages the mapping from logical blocks
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presented by VDO to where the data has actually been physically stored,
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@ -358,8 +358,17 @@ take otherwise as device is already expected to be empty.
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.
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.SS \n+[step]. Memory usage
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.
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The VDO target requires 370 MiB of RAM plus an additional 268 MiB
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per each 1 TiB of physical storage managed by the volume.
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The VDO target requires 38 MiB of RAM and several variable amounts:
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.IP \(bu 2
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1.15 MiB of RAM for each 1 MiB of configured block map cache size.
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The block map cache requires a minimum of 150 MiB RAM.
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.br
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.IP \(bu
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1.6 MiB of RAM for each 1 TiB of logical space.
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.br
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.IP \(bu
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268 MiB of RAM for each 1 TiB of physical storage managed by the volume.
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.br
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.P
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UDS requires a minimum of 250 MiB of RAM,
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which is also the default amount that deduplication uses.
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