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man lvmcache: mention writecache memory usage

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David Teigland 2022-02-21 11:35:58 -06:00
parent 96c99d647e
commit 6144dac897
1 changed files with 12 additions and 0 deletions
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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.
It is also possible to specify a sector size of 4096 to mkfs.xfs when
creating the file system. In this case the writecache block size of 4096
can be used.
.P
.SS dm-writecache memory usage
.P
The amount of main system memory used by dm-writecache can be a factor
when selecting the writecache cachevol size and the writecache block size.
.P
.IP \[bu] 2
writecache block size 4096: each 100 GiB of writecache cachevol uses
slighly over 2 GiB of system memory.
.IP \[bu] 2
writecache block size 512: each 100 GiB of writecache cachevol uses
a little over 16 GiB of system memory.
.
.SS dm-writecache settings
.