Automatic detection of host entities

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SnapDrive for UNIX automatically detects the configuration of the host entity for some commands. A few snap storage commands need only the name of the host entity. In these cases, you do not have to specify the type of the host entity.

The following commands are enabled for automatic detection:

  • storage delete

  • storage resize

  • snap create

  • snap restore

  • snap connect

  • snap list

When the host entity exists, SnapDrive for UNIX automatically detects the type of the host entity. In this case, you need to provide only the name of the host entity; you do not have to specify the type. The SnapDrive snap commands and some storage commands also need only the name of the host entity; you do not have to specify the type.

Automatic detection of commands takes extra time for SnapDrive 4.1 and later because it collects the details of all the storage resources. If you want a faster response, specify the file specification with the SnapDrive for UNIX commands.

You can enable automatic detection for the storage delete operation by running the snapdrive storage delete command.

Example 1:

snapdrive storage delete host_dg my_fs -full

In the example, host_dg and my_fs are automatically detected.

Example 2:

snapdrive storage delete mydg -fs myfs -full

In the example, the mydg disk group is automatically detected.

You can enable automatic detection for the storage resize operation by running the snapdrive storage resize command.

For example:

[root@lnx197-132 ~]# snapdrive storage resize mydg23 -addlun -growby 10m
Auto detecting the type of filespec 'mydg23' in progress ... detected as disk group
        discovering filer LUNs in disk group mydg23...done
        LUN bart:/vol/voldm/mydg23-1_SdLun ... created

        mapping new lun(s) ... done
        discovering new lun(s) ... done.
        initializing LUN(s) and adding to disk group mydg23...done
Disk group mydg23 has been resized

You can enable the automatic detection for the snap create operation by running the snapdrive snap create command.

For example:

root@lnx197-132 ~]# snapdrive snap create mydg22 mydg23 /mnt/mnt12 -snapname new_snap
Auto detecting the type of filespec 'mydg22' in progress ... detected as disk group
Auto detecting the type of filespec 'mydg23' in progress ... detected as disk group
Auto detecting the type of filespec '/mnt/mnt12 ' in progress ... detected as file system

Starting snap create /dev/mapper/mydg22, /dev/mapper/mydg23, /mnt/mnt12
  WARNING:  DO NOT CONTROL-C!
            If snap create is interrupted, incomplete snapdrive
                 generated data may remain on the filer volume(s)
                 which may interfere with other snap operations.
Successfully created snapshot new_snap on bart:/vol/voldm

        snapshot new_snap contains:
        disk group mydg22
        disk group mydg23
        disk group dg121 containing host volumes
                lv121 (filesystem: /mnt/mnt12)

You can enable automatic detection for the snap connect operation by running the snapdrive snap connect command.

For example:

[root@lnx197-132 ~]# snapdrive snap connect mydg22 xxx mydg23 yyy -snapname bart:/vol/voldm:snap_1
Auto detecting the type of filespec 'mydg22' in progress ... detected as disk group
Auto detecting the type of filespec 'xxx' in progress ...
        xxx does not exist - Taking xxx as a destination to fspec mydg22Auto detecting the type of filespec 'mydg23' in progress ... detected as disk group
Auto detecting the type of filespec 'yyy' in progress ...
        yyy does not exist - Taking yyy as a destination to fspec mydg23
 connecting mydg22:
        LUN copy mydg22_SdLun_0 ... created
                 (original: bart:/vol/voldm/mydg22_SdLun)

        mapping new lun(s) ... done

 connecting mydg23:
        LUN copy mydg23_SdLun_1 ... created
                 (original: bart:/vol/voldm/mydg23_SdLun)

        mapping new lun(s) ... done
        discovering new lun(s) ... done
        Importing xxx, yyy
Successfully connected to snapshot bart:/vol/voldm:snap_1
        disk group xxx
        disk group yyy

You can enable the automatic detection for the snap restore operation by running the snapdrive snap restore command.

For example:

snapdrive snap restore bart:/vol/voldm/lun44 /mnt/fs3 fs5_SdDg/fs5_SdHv fs4_SdDg -snapname bart:/vol/voldm:toi_snap

        Auto detection of file_spec(s) in progress ...
               - 'bart:/vol/voldm/lun44' detected as LUN.
               - '/mnt/fs3' detected as file system.
               - 'fs5_SdDg/fs5_SdHv' detected as logical volume.
               - 'fs4_SdDg' detected as disk group.
        Starting to restore /dev/mapper/fs4_SdDg, /mnt/fs3, /dev/mapper/fs5_SdDg-fs5_SdHv, bart:/vol/voldm/lun44
         WARNING:  This can take several minutes.
           DO NOT CONTROL-C!
           If snap restore is interrupted, the filespecs
           being restored may have inconsistent or corrupted
           data.
       For detailed progress information, see the log file /var/log/sd-recovery.log
           Importing fs4_SdDg, fs3_SdDg, fs5_SdDg
           Successfully restored snapshot toi_snap on bart:/vol/voldm
       disk group fs4_SdDg containing host volumes
               fs4_SdHv (filesystem: /mnt/fs4)
       disk group fs3_SdDg containing host volumes
               fs3_SdHv (filesystem: /mnt/fs3)
       disk group fs5_SdDg containing host volumes
               fs5_SdHv (filesystem: /mnt/fs5)
       raw LUN: bart:/vol/voldm/lun44

SnapDrive does not support automatic detection for snap connect and snap restore operations for incorrect file specification.

You can enable automatic detection for the snap list operation by running the snapdrive snap list command.

For example:

root@lnx197-132 ~]# snapdrive snap list -snapname bart:/vol/voldm:snap_1

snap name                            host                   date         snapped
--------------------------------------------------------------------------------
bart:/vol/voldm:snap_1           lnx197-132.xyz.com Apr  9 06:04 mydg22 mydg23 dg121
[root@lnx197-132 ~]# snapdrive snap list mydg23
Auto detecting the type of filespec 'mydg23' in progress ... detected as disk group

snap name                            host                   date         snapped
--------------------------------------------------------------------------------
bart:/vol/voldm:snap_1           lnx197-132.xyz.com Apr  9 06:04 mydg22 mydg23 dg121
bart:/vol/voldm:all                  lnx197-132.xyz.com Apr  9 00:16 mydg22 mydg23 fs1_SdDg
bart:/vol/voldm:you                  lnx197-132.xyz.com Apr  8 21:03 mydg22 mydg23
bart:/vol/voldm:snap_2                  lnx197-132.xyz.com Apr  8 18:05 mydg22 mydg23