2017-09-20 15:45:00 +05:30
|
|
|
NAME
|
|
|
|
|
cache_writeback - writeback dirty blocks to the origin device.
|
|
|
|
|
|
|
|
|
|
SYNOPSIS
|
|
|
|
|
cache_writeback [options] --metadata-device {device|file} --origin-device {device|file} --fast-device {device|file}
|
|
|
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
|
cache_writeback is an offline tool that writes back dirty data to the data
|
2017-09-20 18:23:59 +05:30
|
|
|
device (origin). Intended for use in recovery scenarios when the SSD is
|
2017-09-20 15:45:00 +05:30
|
|
|
giving IO errors.
|
|
|
|
|
|
|
|
|
|
This tool cannot be run on a live cache.
|
|
|
|
|
|
|
|
|
|
OPTIONS
|
2017-09-20 18:23:59 +05:30
|
|
|
-h, --help Print help and exit.
|
|
|
|
|
-V, --version Print version information and exit.
|
2017-09-20 15:45:00 +05:30
|
|
|
--metadata-device {device|file} Location of cache metadata.
|
|
|
|
|
--origin-device {device|file} Slow device being cached.
|
|
|
|
|
--fast-device {device|file} Fast device containing the data that needs to be written back.
|
|
|
|
|
--no-metadata-update Do not update the metadata to clear the dirty flags.
|
|
|
|
|
|
2017-09-20 18:23:59 +05:30
|
|
|
You may want to use this flag if you're decommissioning the cache.
|
2017-09-20 15:45:00 +05:30
|
|
|
|
|
|
|
|
--buffer-size-meg {size} Specify the size for the metadata cache.
|
|
|
|
|
|
|
|
|
|
Defaults to 16 Gig, a larger size may improve performance.
|
|
|
|
|
|
|
|
|
|
--list-failed-blocks List any blocks that failed the writeback process.
|
|
|
|
|
|
|
|
|
|
SEE ALSO
|
|
|
|
|
cache_dump(8), cache_check(8), cache_repair(8), cache_restore(8)
|
|
|
|
|
|
|
|
|
|
AUTHOR
|
|
|
|
|
Joe Thornber <ejt@redhat.com>
|
