FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/man/man8/zpool-import.8

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    .Dd March 16, 2022
    .Dt ZPOOL-IMPORT 8
    .Os
    .
    .Sh NAME
    .Nm zpool-import
    .Nd import ZFS storage pools or list available pools
    .Sh SYNOPSIS
    .Nm zpool
    .Cm import
    .Op Fl D
    .Oo Fl d Ar dir Ns | Ns Ar device Oc Ns …
    .Nm zpool
    .Cm import
    .Fl a
    .Op Fl DflmN
    .Op Fl F Op Fl nTX
    .Op Fl -rewind-to-checkpoint
    .Op Fl c Ar cachefile Ns | Ns Fl d Ar dir Ns | Ns Ar device
    .Op Fl o Ar mntopts
    .Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
    .Op Fl R Ar root
    .Nm zpool
    .Cm import
    .Op Fl Dflmt
    .Op Fl F Op Fl nTX
    .Op Fl -rewind-to-checkpoint
    .Op Fl c Ar cachefile Ns | Ns Fl d Ar dir Ns | Ns Ar device
    .Op Fl o Ar mntopts
    .Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
    .Op Fl R Ar root
    .Op Fl s
    .Ar pool Ns | Ns Ar id
    .Op Ar newpool
    .
    .Sh DESCRIPTION
    .Bl -tag -width Ds
    .It Xo
    .Nm zpool
    .Cm import
    .Op Fl D
    .Oo Fl d Ar dir Ns | Ns Ar device Oc Ns …
    .Xc
    Lists pools available to import.
    If the
    .Fl d
    or
    .Fl c
    options are not specified, this command searches for devices using libblkid
    on Linux and geom on
    .Fx .
    The
    .Fl d
    option can be specified multiple times, and all directories are searched.
    If the device appears to be part of an exported pool, this command displays a
    summary of the pool with the name of the pool, a numeric identifier, as well as
    the vdev layout and current health of the device for each device or file.
    Destroyed pools, pools that were previously destroyed with the
    .Nm zpool Cm destroy
    command, are not listed unless the
    .Fl D
    option is specified.
    .Pp
    The numeric identifier is unique, and can be used instead of the pool name when
    multiple exported pools of the same name are available.
    .Bl -tag -width Ds
    .It Fl c Ar cachefile
    Reads configuration from the given
    .Ar cachefile
    that was created with the
    .Sy cachefile
   pool property.
   This
   .Ar cachefile
   is used instead of searching for devices.
   .It Fl d Ar dir Ns | Ns Ar device
   Uses
   .Ar device
   or searches for devices or files in
   .Ar dir .
   The
   .Fl d
   option can be specified multiple times.
   .It Fl D
   Lists destroyed pools only.
   .El
   .It Xo
   .Nm zpool
   .Cm import
   .Fl a
   .Op Fl DflmN
   .Op Fl F Op Fl nTX
   .Op Fl c Ar cachefile Ns | Ns Fl d Ar dir Ns | Ns Ar device
   .Op Fl o Ar mntopts
   .Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
   .Op Fl R Ar root
   .Op Fl s
   .Xc
   Imports all pools found in the search directories.
   Identical to the previous command, except that all pools with a sufficient
   number of devices available are imported.
   Destroyed pools, pools that were previously destroyed with the
   .Nm zpool Cm destroy
   command, will not be imported unless the
   .Fl D
   option is specified.
   .Bl -tag -width Ds
   .It Fl a
   Searches for and imports all pools found.
   .It Fl c Ar cachefile
   Reads configuration from the given
   .Ar cachefile
   that was created with the
   .Sy cachefile
   pool property.
   This
   .Ar cachefile
   is used instead of searching for devices.
   .It Fl d Ar dir Ns | Ns Ar device
   Uses
   .Ar device
   or searches for devices or files in
   .Ar dir .
   The
   .Fl d
   option can be specified multiple times.
   This option is incompatible with the
   .Fl c
   option.
   .It Fl D
   Imports destroyed pools only.
   The
   .Fl f
   option is also required.
   .It Fl f
   Forces import, even if the pool appears to be potentially active.
   .It Fl F
   Recovery mode for a non-importable pool.
   Attempt to return the pool to an importable state by discarding the last few
   transactions.
   Not all damaged pools can be recovered by using this option.
   If successful, the data from the discarded transactions is irretrievably lost.
   This option is ignored if the pool is importable or already imported.
   .It Fl l
   Indicates that this command will request encryption keys for all encrypted
   datasets it attempts to mount as it is bringing the pool online.
   Note that if any datasets have a
   .Sy keylocation
   of
   .Sy prompt
   this command will block waiting for the keys to be entered.
   Without this flag
   encrypted datasets will be left unavailable until the keys are loaded.
   .It Fl m
   Allows a pool to import when there is a missing log device.
   Recent transactions can be lost because the log device will be discarded.
   .It Fl n
   Used with the
   .Fl F
   recovery option.
   Determines whether a non-importable pool can be made importable again, but does
   not actually perform the pool recovery.
   For more details about pool recovery mode, see the
   .Fl F
   option, above.
   .It Fl N
   Import the pool without mounting any file systems.
   .It Fl o Ar mntopts
   Comma-separated list of mount options to use when mounting datasets within the
   pool.
   See
   .Xr zfs 8
   for a description of dataset properties and mount options.
   .It Fl o Ar property Ns = Ns Ar value
   Sets the specified property on the imported pool.
   See the
   .Xr zpoolprops 7
   manual page for more information on the available pool properties.
   .It Fl R Ar root
   Sets the
   .Sy cachefile
   property to
   .Sy none
   and the
   .Sy altroot
   property to
   .Ar root .
   .It Fl -rewind-to-checkpoint
   Rewinds pool to the checkpointed state.
   Once the pool is imported with this flag there is no way to undo the rewind.
   All changes and data that were written after the checkpoint are lost!
   The only exception is when the
   .Sy readonly
   mounting option is enabled.
   In this case, the checkpointed state of the pool is opened and an
   administrator can see how the pool would look like if they were
   to fully rewind.
   .It Fl s
   Scan using the default search path, the libblkid cache will not be
   consulted.
   A custom search path may be specified by setting the
   .Sy ZPOOL_IMPORT_PATH
   environment variable.
   .It Fl X
   Used with the
   .Fl F
   recovery option.
   Determines whether extreme measures to find a valid txg should take place.
   This allows the pool to
   be rolled back to a txg which is no longer guaranteed to be consistent.
   Pools imported at an inconsistent txg may contain uncorrectable checksum errors.
   For more details about pool recovery mode, see the
   .Fl F
   option, above.
   WARNING: This option can be extremely hazardous to the
   health of your pool and should only be used as a last resort.
   .It Fl T
   Specify the txg to use for rollback.
   Implies
   .Fl FX .
   For more details
   about pool recovery mode, see the
   .Fl X
   option, above.
   WARNING: This option can be extremely hazardous to the
   health of your pool and should only be used as a last resort.
   .El
   .It Xo
   .Nm zpool
   .Cm import
   .Op Fl Dflmt
   .Op Fl F Op Fl nTX
   .Op Fl c Ar cachefile Ns | Ns Fl d Ar dir Ns | Ns Ar device
   .Op Fl o Ar mntopts
   .Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
   .Op Fl R Ar root
   .Op Fl s
   .Ar pool Ns | Ns Ar id
   .Op Ar newpool
   .Xc
   Imports a specific pool.
   A pool can be identified by its name or the numeric identifier.
   If
   .Ar newpool
   is specified, the pool is imported using the name
   .Ar newpool .
   Otherwise, it is imported with the same name as its exported name.
   .Pp
   If a device is removed from a system without running
   .Nm zpool Cm export
   first, the device appears as potentially active.
   It cannot be determined if this was a failed export, or whether the device is
   really in use from another host.
   To import a pool in this state, the
   .Fl f
   option is required.
   .Bl -tag -width Ds
   .It Fl c Ar cachefile
   Reads configuration from the given
   .Ar cachefile
   that was created with the
   .Sy cachefile
   pool property.
   This
   .Ar cachefile
   is used instead of searching for devices.
   .It Fl d Ar dir Ns | Ns Ar device
   Uses
   .Ar device
   or searches for devices or files in
   .Ar dir .
   The
   .Fl d
   option can be specified multiple times.
   This option is incompatible with the
   .Fl c
   option.
   .It Fl D
   Imports destroyed pool.
   The
   .Fl f
   option is also required.
   .It Fl f
   Forces import, even if the pool appears to be potentially active.
   .It Fl F
   Recovery mode for a non-importable pool.
   Attempt to return the pool to an importable state by discarding the last few
   transactions.
   Not all damaged pools can be recovered by using this option.
   If successful, the data from the discarded transactions is irretrievably lost.
   This option is ignored if the pool is importable or already imported.
   .It Fl l
   Indicates that this command will request encryption keys for all encrypted
   datasets it attempts to mount as it is bringing the pool online.
   Note that if any datasets have a
   .Sy keylocation
   of
   .Sy prompt
   this command will block waiting for the keys to be entered.
   Without this flag
   encrypted datasets will be left unavailable until the keys are loaded.
   .It Fl m
   Allows a pool to import when there is a missing log device.
   Recent transactions can be lost because the log device will be discarded.
   .It Fl n
   Used with the
   .Fl F
   recovery option.
   Determines whether a non-importable pool can be made importable again, but does
   not actually perform the pool recovery.
   For more details about pool recovery mode, see the
   .Fl F
   option, above.
   .It Fl o Ar mntopts
   Comma-separated list of mount options to use when mounting datasets within the
   pool.
   See
   .Xr zfs 8
   for a description of dataset properties and mount options.
   .It Fl o Ar property Ns = Ns Ar value
   Sets the specified property on the imported pool.
   See the
   .Xr zpoolprops 7
   manual page for more information on the available pool properties.
   .It Fl R Ar root
   Sets the
   .Sy cachefile
   property to
   .Sy none
   and the
   .Sy altroot
   property to
   .Ar root .
   .It Fl s
   Scan using the default search path, the libblkid cache will not be
   consulted.
   A custom search path may be specified by setting the
   .Sy ZPOOL_IMPORT_PATH
   environment variable.
   .It Fl X
   Used with the
   .Fl F
   recovery option.
   Determines whether extreme measures to find a valid txg should take place.
   This allows the pool to
   be rolled back to a txg which is no longer guaranteed to be consistent.
   Pools imported at an inconsistent txg may contain uncorrectable
   checksum errors.
   For more details about pool recovery mode, see the
   .Fl F
   option, above.
   WARNING: This option can be extremely hazardous to the
   health of your pool and should only be used as a last resort.
   .It Fl T
   Specify the txg to use for rollback.
   Implies
   .Fl FX .
   For more details
   about pool recovery mode, see the
   .Fl X
   option, above.
   .Em WARNING :
   This option can be extremely hazardous to the
   health of your pool and should only be used as a last resort.
   .It Fl t
   Used with
   .Ar newpool .
   Specifies that
   .Ar newpool
   is temporary.
   Temporary pool names last until export.
   Ensures that the original pool name will be used
   in all label updates and therefore is retained upon export.
   Will also set
   .Fl o Sy cachefile Ns = Ns Sy none
   when not explicitly specified.
   .El
   .El
   .
   .Sh EXAMPLES
   .\" These are, respectively, examples 9 from zpool.8
   .\" Make sure to update them bidirectionally
   .Ss Example 9 : No Importing a ZFS Storage Pool
   The following command displays available pools, and then imports the pool
   .Ar tank
   for use on the system.
   The results from this command are similar to the following:
   .Bd -literal -compact -offset Ds
   .No # Nm zpool Cm import
     pool: tank
       id: 15451357997522795478
    state: ONLINE
   action: The pool can be imported using its name or numeric identifier.
   config:
   
           tank        ONLINE
             mirror    ONLINE
               sda     ONLINE
               sdb     ONLINE
   
   .No # Nm zpool Cm import Ar tank
   .Ed
   .
   .Sh SEE ALSO
   .Xr zpool-export 8 ,
   .Xr zpool-list 8 ,
   .Xr zpool-status 8

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