NAME
trim —
erase device blocks that have no needed
contents
SYNOPSIS
trim |
[-Nfqv] [-[lo]
offset[K|k|M|m|G|g|T|t]]
[-r rfile]
device ... |
DESCRIPTION
Thetrim utility erases specified region of the device.
It is mostly relevant for storage that implement trim (like flash based, or
thinly provisioned storage).
All erased data is
lost.
The following options are available:
-N- Do not actually erase anything but show what it would do (dry run).
Implies
-v. This is the default. Overrides-f. -f- Perform the operation. Overrides
-N. -loffset[K|k|M|m|G|g|T|t]-ooffset[K|k|M|m|G|g|T|t]- Specify the length
-lof the region to trim or its offset-ofrom the beginning of the device. The whole device is erased by default unless one or both of these options are presented.The argument may be suffixed with one of
K,M,GorT(either upper or lower case) to indicate a multiple of Kilobytes, Megabytes, Gigabytes or Terabytes respectively. -q- Do not output anything except of possible error messages (quiet mode).
Overrides
-v. -rrfile- Uses the length of given rfile as length of the region to erase. The whole device is erased by default.
-v- Show offset and length of actual region being erased, in bytes.
Later options override previous ones.
Note that actual success of the operation depends of underlying device driver such as ada(4), da(4) and others. Refer to corresponding manual pages for detail on possible caveats in low level support for ATA TRIM or SCSI UNMAP commands.
EXIT STATUS
The trim utility exits 0 on
success, and >0 if an error occurs. If the final erase operation
fails for an argument, the trim utility returns exit
code 1. It can also return one of the exit codes defined in
sysexits(3), as follows:
EX_USAGE- The specified offset or length of the region is incorrect.
EX_OSERR- There is no enough memory to proceed.
EX_NOINPUT- The specified rfile cannot be opened (perhaps, it does not exist).
EX_IOERR- The specified rfile cannot be examined for its size due to some system input/output error.
EX_DATAERR- The specified rfile is not regular file, directory nor special device, so its size cannot be examined.
EX_UNAVAILABLE- The specified rfile is special device file not supporting DIOCGMEDIASIZE ioctl(2) (probably not a disk), so its size cannot be examined.
SEE ALSO
HISTORY
The trim utility first appeared in
FreeBSD 12.1.
AUTHORS
The trim utility was written by
Eugene Grosbein
<eugen@FreeBSD.org>.