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Diffstat (limited to 'Documentation/btrfs-check.asciidoc')
| -rw-r--r-- | Documentation/btrfs-check.asciidoc | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/Documentation/btrfs-check.asciidoc b/Documentation/btrfs-check.asciidoc index 4e27863e..abc9f0dc 100644 --- a/Documentation/btrfs-check.asciidoc +++ b/Documentation/btrfs-check.asciidoc @@ -93,11 +93,18 @@ build the extent tree from scratch + NOTE: Do not use unless you know what you're doing. ---low-memory:: -check fs in low memory usage mode(experimental) -May takes longer time than normal check. +--mode=MODE:: +select mode of operation regarding memory and IO + -NOTE: Doesn't work with '--repair' option yet. +The 'MODE' can be one of 'original' and 'lowmem'. The original mode is mostly +unoptimized regarding memory consumpption and can lead to out-of-memory +conditions on large filesystems. The possible workaround is to export the block +device over network to a machine with enough memory. The low memory mode is +supposed to address the memory consumption, at the cost of increased IO when it +needs to re-read blocks when needed. This may increase run time. + +NOTE: 'lowmem' mode does not work with '--repair' yet, and is still considered +experimental. EXIT STATUS ----------- |