36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
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From cdefd8635de24200b55822fa0b6bc23a638fb87a Mon Sep 17 00:00:00 2001
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From: David Teigland <teigland@redhat.com>
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Date: Mon, 21 Feb 2022 11:35:58 -0600
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Subject: [PATCH 33/54] man lvmcache: mention writecache memory usage
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---
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man/lvmcache.7_main | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/man/lvmcache.7_main b/man/lvmcache.7_main
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index 48cf7b492..73680235b 100644
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--- a/man/lvmcache.7_main
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+++ b/man/lvmcache.7_main
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@@ -240,6 +240,18 @@ The writecache block size should be chosen to match the xfs sectsz value.
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It is also possible to specify a sector size of 4096 to mkfs.xfs when
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creating the file system. In this case the writecache block size of 4096
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can be used.
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+.P
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+.SS dm-writecache memory usage
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+.P
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+The amount of main system memory used by dm-writecache can be a factor
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+when selecting the writecache cachevol size and the writecache block size.
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+.P
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+.IP \[bu] 2
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+writecache block size 4096: each 100 GiB of writecache cachevol uses
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+slighly over 2 GiB of system memory.
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+.IP \[bu] 2
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+writecache block size 512: each 100 GiB of writecache cachevol uses
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+a little over 16 GiB of system memory.
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.
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.SS dm-writecache settings
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.
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--
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2.34.3
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