Selective Restore from the Command Line
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|WORK IN PROGRESS|
|This page is a draft. Treat the information on this page with caution as it may be incomplete.|
- 1 Overview
- 2 Selective restore by using the command line
- 2.1 Insert the tape into the tape drive
- 2.2 List the backups on the tape by using sm_sms_interface
- 2.3 Perform a complete restore
- 2.4 Perform a selective restore
- 3 See also
SEP sesam enables you to perform a selective restore from the unknown tape using the command line (SBC CLI). Selective restore is a process by which only the selected parts of data on the saveset, such as individual files and directories, are restored.
Selective restore by using the command line
Restore steps at a glance:
- Insert the tape into the tape drive.
- Set the SEP sesam profile, as described in FAQ: How to set a SEP sesam profile.
- List all the backups on the tape drive.
- Perform a complete restore of the saveset(s).
- Perform a selective restore.
Insert the tape into the tape drive
Insert/load the tape that contains the backup you want to restore into the tape drive.
List the backups on the tape by using sm_sms_interface
sm_sms_interface dir -d <tape_drive>
Example for the first non-rewinding tape drive on Linux:
sm_sms_interface dir -d /dev/nst0
Obtain the required information from the output as shown in the example below:
- The first number in the highlighted line is the segment number; in our example: 4.
- The SavesetName is SEP sesam unique identification assigned to a saveset; in our example: SC20090610105624.
- The Tapelabel in the header displays the <tape_name>; in our example: cefix00001.
- The TapeID in the header displays the <tape_id>; in our example: (1)
Perform a complete restore
To perform a complete restore of the selected saveset, check the example above about obtaining the required information, and then run the following sbc command:
sbc -r -l FULL -C <client_host>:11001 -S <server_host>:11001 -d SMS:<tape_device> -t <tape_label>:<tape_id> -s <saveset_id> -n <segment_number> -R /<restore_target>
Perform a selective restore
The procedure for selective restore from the command line consists of the following steps:
- Re-create the SEP sesam listing files using sm_arch.
- Create a selective file.
- Start the selective restore from the command line.
Step 1: Re-create the SEP sesam listing files by using sm_arch
Re-create the SEP sesam listing files (*.lis) from tape. SEP sesam *.lis' files contain information about the backup's unique files that are used by restore. The command sm_arch restore_journal creates a new *.lis file for the corresponding medium.
sm_arch restore_journal -d <drive> -m <media_pool> -t <tape_label> -T <tape_type> -s <saveset_ID>
|You have to enter the entire saveset ID, including the characters after the @ sign if they exist.|
- The following example uses the values from the above output:
sm_arch restore_journal -d 1 -m cefix -t cefix00001 -T LTO -s SC20090610105624
sm_arch restore_journal -d 1 -m cefix -t cefix00001 -T LTO -s SC20090610105624@gft456Sd
Once the journal is restored, you can find the new .lis file in the
Step 2: Create a selective list of files
Create a selective list of files for the specific data you want to restore.
- Grep the previously created .lis file for the file names (and in the next step write these to a to a file of your liking ending with .sel).
- Write the output of this command (complete) line to a file called <saveset_ID>.sel; in our example this is SC20090610105624.sel.
- Copy this file to
grep <my_desired_file_to_restore> <SESAM_INSTAL_DIR>/var/lis/<lis_file_generated_with_sm_arch>.lis
Step 3: Start the restore in the selective mode
Start the restore by specifying the selective mode; use the following command:
sbc -r -l sel -C <client_host>:11001 -S <server_host>:11001 -d SMS:<tape_device> -t <tape_label>:<tape_id> -s <saveset_id> -n <segment_number> -R /<restore_target>
This command looks for a file in the
<SESAM_INSTALL_DIR>/var/work/smslis/ directory which contains the name of the saveset ID and restores only the file listed in this selective file.