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dump(8): clarify the recommended use of cache and snapshots

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PR:		131626
MFC after:	1 week
Submitted by:	Andrew Hamilton-Wright <andrew@qemg.org>
Reviewed by:	bcr
Differential Revision:	https://reviews.freebsd.org/D27775
This commit is contained in:
Guangyuan Yang 2020-12-28 21:54:36 +00:00
parent 0c09f4b0cc
commit 70a2e109bd
1 changed files with 6 additions and 4 deletions
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10
sbin/dump/dump.8
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@ -29,7 +29,7 @@
.\" @(#)dump.8 8.3 (Berkeley) 5/1/95
.\" $FreeBSD$
.\"
.Dd June 13, 2019
.Dd December 28, 2020
.Dt DUMP 8
.Os
.Sh NAME
@ -134,9 +134,11 @@ Specify the cache size in megabytes.
This will greatly improve performance
at the cost of
.Nm
possibly not noticing changes in the file system between passes.
It is
recommended that you always use this option when dumping a snapshot.
possibly not noticing changes in the file system between passes
unless a snapshot is being used.
The potential for performance improvement indicates that
use of this option together with snapshots is the recommended
course of action.
Beware that
.Nm
forks, and the actual memory use may be larger than the specified cache