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Scanner

You can use the scanner program to recreate the LSM client index entries or recreate media database entries, if no entries for the volume exist in the media database. The scanner program can read a storage volume directly, without assistance from LSM.

To find the volume that contains a specific file, use the mminfo program if the volume is still in the media database or the scanner program if the volume is no longer in the media database. The mminfo and scanner programs provide detailed information on the contents of the volume. This information includes:

• The name of the backup volume

• The name of the save set that contains the file you want

• The name of the client to which the file belongs

• The date and time the file was backed up

Using the Scanner Program

The scanner program reads a storage volume directly, without accessing information that may be available in the LSM media database. If no entries exist in the media database, you must make an educated guess as to which volume contains the specific data.

Mount the volume and execute the scanner command with any of its options. The most commonly used scanner options are as follows:

• Rebuild the media database entries for everything on the storage volume by executing scanner -m device.

• Rebuild the media database and client index entries for everything on the storage volume by executing scanner -i device.

• Rebuild the media database entries for a specific save set on the storage volume by executing scanner -S save-set-id -i device.

• Rebuild the media database and client index entries for a specific save set on the storage volume by executing scanner -S save-set-id -m device.

• Execute scanner with -c client-name and -N save-set-name options, along with any other of the options previously described to further specify the save sets by client or name.

Detailed information about scanner program syntax and examples of how scanner options can be customized to meet the needs of a particular recovery situation are available in the scanner entry in the LSM Command Reference Guide. For details on how to access the LSM Command Reference Guide, see "Legato Command Reference Guide".

The entries placed in the client index receive a status of "scanned-in" to protect them from being automatically deleted the next time the index management service checks the index for entries that have surpassed their browse policy. The entries placed in the media database also receive a status of "scanned-in" and the volume mode is listed as "read-only." These entries will need to be manually deleted.

Scanner Program Options

The scanner program directly reads LSM media (backup tapes) to confirm the contents of a volume or to rebuild the LSM online indexes. You can only run this command as Administrator or equivalent. You must specify a device, which is usually one of the device names used by the LSM Server. If the device is a tape drive, it must be a non-rewinding type.

If the scanner program is invoked without options (or with only the -v option), the volume on the specified device is scanned and a table of contents is generated. The table of contents contains information about each save set found on the volume. By default, one line of information is written to standard output for each save set found on the volume. The information provides the client name, save set name, save time, level, size, files, save set ID, and a flag.

The following example describes the format and options available for the scanner program:

scanner [ -Bimnpqv ] [ -s server ] [ -S ssid ] 

[ -c client ] [ -N name ] [ -f file ] [ -r record ] 

[ -t type ] [ -b pool ] device [ -x command argument-list ] 

• Use the -b pool option to specify the pool that the volume should belong to. This option only applies to volumes backed up by versions of LSM that did not store pool information on the media.

• Use the -B option, without the -S option, to quickly scan the tape to the location of the start of the bootstrap save sets. When the entire tape has been scanned, the save set ID and tape file location of the most recent bootstrap save set is printed to standard output.

• Use the -c client option to instruct scanner to only process save sets that came from the computer specified by client. You can specify more than one client name in the same command line. The -c option can also be used in conjunction with the -N option, but only if the -i or -x option is also specified.

• Use the -f file option to start the scan at a specific media file number. Refer to the mminfo entry in the LSM Command Reference Guide for information on how to determine the media file number. For details on how to access the LSM Command Reference Guide, see "Legato Command Reference Guide".

• Use the -i option to instruct scanner to rebuild both the client index and media database from the volumes that are read. If you specify a single save set with the -S ssid option, only the entries from the specified save set are made to the client index.

• Use the -m option to instruct scanner to rebuild only the media database for the volumes that are read.

• Use the -n option to run scanner without rebuilding the client index or media database. This option provides a way to check the media without modifying the client index or media database.

• Use the -N name option to process only save sets that match the specified name. The value of name should be a literal string. You can specify multiple names when this option is used in conjunction with the -c client option, but only if the -i or -x option is also specified.

• Use the -p option to print out information about each save set as it is processed.

• Use the -q option to only display error messages or messages of significance.

• Use the -r record option to start the scan at a specific media record number, to avoid a scan of potentially unused information. Refer to the mminfo entry in the LSM Command Reference Guide for information on how to determine the media record number. For details on how to access the LSM Command Reference Guide, see "Legato Command Reference Guide".

• Use the -s server option to specify the controlling LSM Server.

• Use the -S ssid option to extract the save set specified by ssid. When this option is used in conjunction with the -i or -x option, you can specify multiple ssid values. The save sets selected are in addition to any selected by the use of the -c and -N options. If the -B option is also specified, the value of ssid is assumed to be that of the bootstrap save set; only one ssid can be specified in this case.

• Use the -x command option, with an optional list of command arguments, to specify a command to execute on each save set scanned. This option can only be specified once per scanner command line, after the device specification.

Refer to the scanner entry in the LSM Command Reference Guide for examples of scanner command usage and a list of common error messages.

Rebuilding Save Set Entries in LSM Online Indexes

If a file is not browsable (which means that the save set's browse policy has expired), but its save set is still tracked by LSM in the media database (which means that the save set's retention policy has not expired), follow these steps to recover the save set's entry back into the client index:

1. Run the mminfo program:

   mminfo -a -v volume-name
   
   

2. From the mminfo output, find the save set ID that you believe contains the file you want. Make sure it is not the bootstrap save set ID.

3. Once you have the proper save set ID, replace the save set entry in the file index with the scanner program:

   scanner -i -S save-set-id device-name
   

   Note: If the save set spans volume boundaries, use the scanner program to read from all the volumes. Otherwise, the client index will not be fully rebuilt, making it impossible to perform an online recovery of the files in this save set.

If the save set that contains the file is not browsable, and the save set is not represented in the media database, both the browse and retention policies have expired. Follow these steps to rebuild the save set's entry in both the client index and the media database:

1. Run the scanner program on the backup volume that you believe contains the file you want (make a guess based on the adhesive label on the volume).

   scanner device-name
   
   

2. Use the output from the scanner program to decide whether to reintroduce the contents of this volume into the client index and whether the save set you want to rebuild is on this volume. You must locate all of the volumes that contain this save set ID.

3. Once you have determined which volumes to reintroduce into the online indexes, run the scanner command below:

   scanner -i device-name
   
   

   The scanner command asks for a new volume until you terminate it. To rebuild the indexes completely, you must scan in all of the volumes that contain the save set ID.

Scanner Requests an Entry for Record Size

If you use the scanner program with the -s option but without an -i or -m option, and you receive the following message:

please enter record size for this volume ('q' to quit) [xx] 

the number in the bracket [xx] is the entry from the last query.

The scanner command always rewinds the tape and reads the volume label to determine the block size. If the volume label is corrupted or unreadable, you will see a message asking you to enter the block size (in kilobytes).

Type in the block size; it must be an integer equal to or greater than 32. If you enter an integer that is less than 32, you receive the following message:

illegal record size (must be an integer >=32) 

Scanner Marks a Volume Read-Only

When you use the scanner program to rebuild the index of a backup volume, the scanner program marks the volume read-only. This is a safety feature that prevents the last save set on the backup volume from being overwritten. To write to the media without marking it read-only, use the nsrmm -o command:

# nsrmm -o notreadonly volume-name

For more information on the nsrmm command, refer to the nsrmm entry in the LSM Command Reference Guide. For details on how to access the LSM Command Reference Guide, see "Legato Command Reference Guide".