FSCK_CS(8) BSD System Manager's Manual FSCK_CS(8)NAMEfsck_cs — verify and repair CoreStorage logical volume groups
SYNOPSISfsck_cs-q device ...
fsck_cs-p device ...
fsck_cs [-y | -n] [-x | -g] [-l logfile] device ...
DESCRIPTION
The fsck_cs utility verifies and repairs CoreStorage logical volume group
metadata.
The device parameter(s) should be path(s) to the "raw" (character spe‐
cial) disk device(s) such as /dev/rdisk1s1 that constitute the CoreStor‐
age logical volume group. If you specify a "non-raw" (block special)
path such as /dev/disk1s1, or just the disk name such as disk1s1, it will
automatically be converted to the corresponding raw disk device
(/dev/rdisk1s1).
The options are as follows:
-q Performs a "quick" check and indicates if any corrup‐
tions were found via the exit status. In this mode
stale MLV segments are not checked, nor is proactive
MLV mirror scrubbing performed.
-p Operates in "preen" mode. MLV mirror blocks are
repaired where necessary. Newer transactions may be
invalidated to force a roll-back to an older, but con‐
sistent, filesystem state.
-y Causes fsck_cs to assume "yes" as the answer to all
questions. In other words, always attempt to repair
any errors that are found.
-n Causes fsck_cs to assume "no" as the answer to all
questions. In other words, never attempt to repair any
errors that are found.
-x Causes fsck_cs to produce its output in an XML-like
(plist) format. This option is used when another
application with a graphical user interface (like Mac
OS X Disk Utility) is invoking the fsck_cs tool and
processing the output.
-g Causes fsck_cs to produce its output in GUI-compatible
form. This is similar in usage to the -x option.
-l logfile Reproduce all console output, as well as additional
status and error messages, to the specified file.
Alternatively device can be specified as the UUID of the CoreStorage log‐
ical volume group or as the name of a CoreStorage-hosted logical volume
within that group, causing fsck_cs to derive the constituent raw
device(s) from the IORegistry. In these cases you must indicate what
object is being supplied to identify the logical volume group:
--pv the component CoreStorage physical volume(s) directly
--uuid the CoreStorage logical volume group (as a UUID)
--lv a CoreStorage logical volume (as a device name)
DIAGNOSTICS
The fsck_cs utility exits with 0 if no corruption was detected or if all
corruptions were repaired, and with >0 if any unrepaired corruption
remains.
BUGSfsck_cs does not perform an exhaustive validation, nor is it able to fix
many of the inconsistencies that it does detect.
HISTORY
The fsck_cs utility first appeared along with CoreStorage in Mac OS X
10.7.0.
Darwin July 22, 2011 Darwin
