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FSCK_CS(8)                BSD System Manager's Manual               FSCK_CS(8)

NAME
     fsck_cs -- verify and repair CoreStorage logical volume groups

SYNOPSIS
     fsck_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 special) disk device(s) such as
     /dev/rdisk1s1 that constitute the CoreStorage 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 corruptions 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 consistent,
                       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 logical volume group or as the
     name of a CoreStorage-hosted logical volume within that group, causing fsck_cs to derive the con-stituent constituent
     stituent raw device(s) from the IORegistry.  In these cases you must indicate what object is being sup-plied supplied
     plied 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.

BUGS
     fsck_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