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Snapdrive for Unix

Connecting to a single filespec in a LUN

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You can connect to a single filespec which resides in a LUN. The following example describes how you can complete this operation.

Note Filespec can be any one of file system, host volume, disk group, or a LUN.

For creating restricted FlexClone, you need to set the option san-clone-method =optimal in snapdrive.conf file or give -clone optimal before you can connect the filespec. This example displays the results when you want to connect a filespec /mnt/fs1 which resides in a LUN homer:/vol/vol1/lun1

The layout of the source file system /mnt/fs1 is given below:

# snapdrive storage show -fs /mnt/fs_1 -capabilities
raw device: /dev/sdc1 mount point: /mnt/fs_1 (persistent) fstype jfs2

allowed operations: all

device filename adapter path size proto state clone lun path backing snapshot
-------------- ------- ---- ---- ----- ----- ----- -------- ----------------
/dev/sdc -  P 100m iscsi online No homer:/vol/vol1/lun1  -
# snapdrive snap connect -fs /mnt/fs_1 -snapname homer:/vol/vol1:snap1 -autorename

 connecting /mnt/fs_1:
        creating restricted volume clone homer:/vol/Snapdrive_vol1_volume_clone_from_snap1_snapshot ... success

        mapping new lun(s) ... done
        discovering new lun(s) ... done
Successfully connected to snapshot homer:/vol/vol1:snap1
        file system: /mnt/fs_1_0

Here, SnapDrive for UNIX automatically chose to create a restricted FlexClone Snapdrive_vol1_0_volume_clone_from_snap1_snapshot from snapshot snap1 and connected it to the LUN testlun1 in this FlexClone to create a cloned host file system /mnt/fs_1_0.

# snapdrive storage show -fs /mnt/fs_1_0 -capabilities

raw device: /dev/sde1   mount point: /mnt/fs_1_0 (persistent) fstype jfs2
allowed operations: snap disconnect; snap list; snap show; storage show; storage list

device filename adapter path size  proto  state  clone  lun path backing snapshot
--------------- ------- ---- ----- ------ ------ ------ -------- ----------------
/dev/sde  -  P  100m iscsi online flex-clone homer:/vol/Snapdrive_vol1_volume_clone_from_snap1_snapshot/lun1 vol1:snap1

SnapDrive for UNIX names the destination FlexClone with the prefix mentioned in the CLI.

If the generated FlexClone name (with prefix) is already in use, SnapDrive for UNIX gives an error message. In this case, you can use -autorename option along with -prefixfv to auto generate clone volume names.

-prefixfv CLI option is applicable only for SAN based filespecs. The -destfv CLI option is ignored by SnapDrive for UNIX for SAN based filespecs during FlexClone operation.

Note SnapDrive for UNIX displays a warning when a Snapshot copy is locked due to LUN clones. However, SnapDrive for UNIX proceeds with the snap connect operation.