50 lines
1.8 KiB
Diff
50 lines
1.8 KiB
Diff
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From 1a39e0c2c24c7c505753658f9a74bf962fdf013b Mon Sep 17 00:00:00 2001
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From: Zdenek Kabelac <zkabelac@redhat.com>
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Date: Mon, 4 Jul 2022 15:00:26 +0200
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Subject: [PATCH 075/115] vdo: update info about memory
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Add more info about kernel target memory allocation associated with
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VDO pool usage.
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(cherry picked from commit f445624c339a5c1436a47d2b51046869f183eb03)
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---
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man/lvmvdo.7_main | 15 ++++++++++++---
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1 file changed, 12 insertions(+), 3 deletions(-)
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diff --git a/man/lvmvdo.7_main b/man/lvmvdo.7_main
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index 14bd640b5..8c3e3eeaa 100644
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--- a/man/lvmvdo.7_main
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+++ b/man/lvmvdo.7_main
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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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--
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2.41.0
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