To access the LONE-TAR Environment Menu, please go to the command line as user root and type the following command:
# ltmenu ; then select option 8 (Environment)
Selective Backup Menu Options:
|1. Backup||Modify VARIABLES that affect LONE-TAR backups.
Click to view variables below
|2. Verify||Modify VARIABLES that affect LONE-TAR verifies.
Click to view variables below
|3. Restore||Modify VARIABLES that affect LONE-TAR restores.
Click to view variables below
|4. Compression||Modify VARIABLES that affect LONE-TAR compression settings.
Click to view variables below
|5. TAPE-TELL||Modify VARIABLES that affect LONE-TAR TAPE-TELL settings.
Click to view variables below
|6. Catalogs||Modify VARIABLES that affect LONE-TAR catalogs.
Click to view variables below
|7. Output||Modify VARIABLES that affect LONE-TAR output, i.e. Email, Printers, etc.
Click to view variables below
|8. Tape Drive||Modify VARIABLES that affect LONE-TAR backups to tape devices.
Click to view variables below
|D. Details of ALL||Modify VARIABLES that affect LONE-TAR from every Environment sub-menu.|
|S. Summary of ALL||Shows quick summary of every variable and what it currently equals.|
|A. Read CFG File||Read the LONE-TAR Configuration File /usr/lone-tar/ltar.cfg|
|B. Read CFG Manual||Read the LONE-TAR Configuration Manual that has an explanation of each variable in greater detail.|
|Q. Quit||Quit back to LONE-TAR Main menu.|
| 1. Double Buffering During Backups
||Default is "OFF". If set to 'Y' will invoke the LONE-TAR '-S' flag in all the scripts ltar.*. This will turn ON double buffering, which in most cases will reduce the amount of time required to do a backup. Has no effect during a verify or restore. Only speeds up a backup.|
| 2. Logoff ALL users before a backup
||Default is "N". By setting this variable to 'Y' will log everyone off before a backup begins. Cron backups will use source file 'loggoff_cron' to log users off. Menu backups will use source file 'logoff_menu' to log off users. You may need to enter a $PASSWORD to be allowed to log users OFF from the menu system. You can edit logoff_* and select which users NOT be logged off. Only the following files are effected by variable $LOGOFF_ALL: bu ltar.M.cron ltar.I.cron ltar.S.cron|
| 3. Prevent Logins during backup
||Default is "N". If set to 'Y' will prevent all users except 'root' from login during a LONE-TAR backup. Here's how it works:
1. All the LONE-TAR scripts get the variable LOCK_OUT_USERS from '/usr/lone-tar/ltar.cfg'
2. If LOCK_OUT_USERS is set to 'Y', then 'ltar_before' will create a file '/etc/LTAR.LOCK'.
3. WARNING!!!: The file '/usr/lone-tar/ltar.lock' is a shell script that MUST be put inside the BEGINNING of file '/etc/profile' for all this to work. This is automatically done when this feature is added from within 'ltmenu'.
4. When the backup is complete, 'ltar_after' will REMOVE the lock file '/etc/LTAR.LOCK', and allow all users to log back into your system. The beautiful thing about both scripts 'ltar_before' and 'ltar_after', is that they will create and remove the LOCK file at the correct time, regardless of a success or failure of a backup or verify.
| 4. File LOCKING Level
||Default is "R". This determines the type of file locking you want during a backup. Options are
R ..... Unenforced read lock.
RR .... Enforced read lock
RRR ... Turns OFF locking competely.
"" .... Do not implement RLOCK.
| 5. 'CRON' backups requiring more than 1 tape
||Default is "N". Only effected by UNATTENDED (cron) backups. The only scripts that use this variable are 'ltar.*cron'. By setting this variable to 'Y' will cause the ENTIRE output file of the LONE-TAR backup to go to $TERMINAL. This is desired when one needs to know when it's time to remove tape 1... and insert tape 2. When a 'cron' backup needs to switch volumns... you will see a message on $TERMINAL:
PLEASE REMOVE VOLUME 1
INSERT VOLUME 2
Enter (y/n) and Press RETURN __
(ie: echo 'y' > /dev/ltar_listen)
At this point, you could type this command from another
terminal... or from the LONE-TAR Main Menu select:
u ==> 1 ==> 5 ==> 1
What's the difference between $DISPLAY and $D_CRON_MULTI?
$DISPLAY will display only the summary of the backup by
'tail -$TAIL_T $LOG | $TERMINAL'
$D_CRON_MULTI will send ALL $LOG to $TERMINAL.
| 6. RAW Partition backups
||Default is "OFF". This variable should ONLY be used in the event you need to backup a RAW partition. RAW partitions are commonly used for such databases as Informix(tm), Progress(tm), and Oracle(tm). Many UNIX
systems can access a DOS partition. LONE-TAR can backup this DOS partition as a RAW device. The RAW partition MUST be a character type of device... NOT a block type device, except under SCO OSR5 which would require a "block" device and not a "character" device name.
# ls -l /dev/u /dev/ru
crw-r----- 1 sysinfo sysinfo 1,104 Oct 20 1994 /dev/ru
brw-r----- 1 sysinfo sysinfo 1,104 Mar 29 05:04 /dev/u
^------ The first character of a long listing will tell you the device type. b=block, c=character. RAW partitions are 'c' CHARACTER Devices!.
WARNING: It is important that the RAW Partition is NOT mounted.
NOTE: Many databases need to be shutdown properly BEFORE you can back them up. These databases have their own shutdown routines. You should take a look at source files: '/usr/lone-tar/ltar_before' '/usr/lone-tar/ltar_after' They contain examples on where to embed your shutdown commands, so LONE-TAR can do a proper backup, meeting all the guide lines of your database vendor.
| 7. Backup Virtual Files
||Default is "N". If $VIR_FILES="Y", then $VIRTUAL_LIST will be set and exported. If you do not have space or virtual files to backup, then leave this set to 'N'.|
| 8. Delay for backups made over network
||Default is "20". This enables you to slow down the I/O of a network NFS backup. Sometimes errors occur because there is an I/O bottleneck between the remote CPU and the local tape drive. The higher the number, the greater the
| 9. Set number of buffers during backups
||Default is "5". Allows you to raise or lower the number of buffers used during a backup. If there's a lot of activity on the system during a backup, and you need to get the backup done as a priority, then raise the numeric value to ie: ZBUFFERS="20". DOUBLE_BUFF must be set to "Y" for ZBUFFERS to take effect.|
| 10. Execute 'create_si' for Selective/Incremental backup.
||Default is "OFF". This variable determines if we execute shell script 'create_si' before a Selective Backup. By executing 'create_si' will generate an Inclusion list of files that are a combination of both an Incremental <--and--> Selective backup list.
MENU: Only execute from 'ltmenu' Selective backup
CRON: Only execute during a 'cron' unattended backup
BOTH: Both MENU or CRON
OFF: Neither. Do not execute at all.
1. There are some of you that like the methodology of the Master/Incremental backup strategy. However, you may prefer to also include ALL your data directory files in addition to the files that would be backed up on an Incremental backup.
2. You will need to edit 'create_si' and customize a function named 'build_db_list()' to fit your needs.
3. The script should be thoroughly tested from the command line before you actually implement it. You are responsible to make sure the final inclusion list is not missing any critical files to backup.
4. There is a variable inside 'ltar.S.tape' named ASK=" ". If set to 'Y' will interact with the user before executing 'create_si' from 'ltmenu' only.
| 1. Verify Backup
Variable Name = VERIFY
|Default is "Y". By setting to 'Y' will tell LONE-TAR to verify all backups after they are complete. The verification scripts are named ltar.V.tape and ltar.V.cron.|
| 2. Verify Level
Variable Name = V_FLAG
|Default is "TT". This is the verification level:
t = Read file headers only.
T = Check sum of file headers only.
TT = Full byte by byte verification
It is always advised to use bit-level verification. Though it may take a little longer to verify, it certainly assures full data integrity.
Some of you may want to select the $V_Flag on-the-fly when verifying from the LONE-TAR menu system. If this is the case, simply edit '/usr/lone-tar/ltar.V.tape'. Set variable:
OPTIONS= # <=== leave it blank
This will interact with you when it comes time to verify. By default OPTIONS= is already commented out in file 'ltar.V.tape'... and whatever $V_Flag is set to in '/usr/lone-tar/ltar.cfg' is what will occur.
| 3. Seconds to sleep after MENU Verify
Variable Name = SLEEP_AFTER_VERIFY
|Default is "0". When a backup has completed from the Menu (ltmenu), a verification will follow providing VERIFY="Y". When the verification is complete, the screen will be waiting for the user to:
"Press [ENTER] to continue"
In the event you want the Menu to continue *without* the user having to press the [ENTER] key, then set SLEEP_AFTER_VERIFY to a NUMERIC value. The number '0' means wait for the [ENTER] key. Any other number will 'sleep' for that many seconds, then continue on. The *only* script affected by this variable is 'ltar.V.tape'.
| 4. Append entire byte failure log 'changed.V' to 'ltar.log'
Variable Name = BU_LOG
|Default is "N". If set to 'Y' will cause the entire bit-level error log '$TARDIR/changed.V' to be appended to '$TARDIR/ltar.log'. This would ONLY occur if there were bit-level verification errors. The *only* scripts affected by this variable are 'ltar.V.tape' and 'ltar.V.cron'.|
| 1. FAST-SEEK exact block offset or under shoot
Variable Name = UNDERSHOOT
|Default is "0". Used during a FASTSEEK restore to lower the offset number that LONE-TAR will seek to. If it is set to any non-zero value, FASTSEEK will fast seek to a percentage of the calculated block offset of a file, then sequentially read the tape to locate it. This can be useful when using an Archive Catalog File different from the tape being used to restore.|
| 2. Create FasSeek Index [MASTER]
Variable Name = MK_LM_INDEX
|Default is "Y". A LAST_Master INDEX will be made if set to "Y". This unique index makes FASTSEEK restores the fastest on the market. The file that gets executed is '$LTAR_HOME/mk.fs.index'. On some OS's '$LTAR_HOME/mk.fs.index' does not exist making this variable ignored. It *does* require 'mawk' and 'look'. FASTSEEK will still function without this unique index file. Requires LONE-TAR v3.2 or greater.|
| 3. Create FasSeek Index [INCREMENTAL]
Variable Name = MK_LI_INDEX
|Same as $MK_LM_INDEX except for Incremental Backup|
| 4. Create FasSeek Index [SELECTIVE]
Variable Name = MK_LB_INDEX
|Same as $MK_LM_INDEX except for Selective Backup|
| 1. Directory for temp files during compression
Variable Name = TMPDIR
|Default is "/tmp". This is the area where the "virtual pipe" occurs during compression. If you have your hard disk partitioned, or several hard disks mounted, then this variable should be set to the partition with the MOST free space. Do a 'df' command to see which partition has the most free space. If you only have a root partition then leave this set to '/tmp'.|
| 2. Don't compress files smaller than LIMIT
Variable Name = LIMIT
|Default is "15". The LONE-TAR flag 'L' tells LONE-TAR to compress any files (providing COMPRESS=Y) over whatever LIMIT is set to. By setting LIMIT to '500' would tell LONE-TAR to only compress files over 500 blocks in size. Do NOT set this to 'null'. The lowest number you should use is '2'.|
| 3. Suffixes to exclude from compression
Variable Name = SUFFIXES
|Default is ".z .Z .gz .bz .bz2 .gif .jpeg .jpg .image .zip" This is a list of file name suffixes you do NOT want to compress (providing COMPRESS=Y). Do not use wild-cards here as they are not needed. Any file name ending with
$SUFFIXES will NOT compress during a backup. Similar to $COMP_EXCL except $SUFFIXES is faster.
| 4. Files / Directories to exclude from compression
Variable Name = COMP_EXCL
|Default is "/bin/lone-tar". This variable is a list of files or directories to exclude from compression. Wild cards are OK. It serves the same function as $SUFFIXES except would be used when there is a large list of files or directories you do NOT want to compress. Slower then $SUFFIXES.|
| 5. Set action if software & hardware compression conflict
Variable Name = COMPRESS_CONFLICT
|Default is "HARD". Determines what action will be taken in the event both LONE-TAR compression and tape drive compression are turned ON. Available options are:
WARN - Warn User of conflict
HARD - Force Hardware compression
SOFT - Force LONE-TAR compression (if COMPRESS="Y")
NONE - Take no action and give no warnings
Some operating systems allow you to toggle hardware compression from the command line.
Here's an example using SCO OSR5:
# tape getcomp /dev/rStp0 <- Show tape information
# tape -a 0 setcomp /dev/rStp0 <- Turn OFF Hardware compress
# tape -a 3 setcomp /dev/rStp0 <- Turn ON Hardware compress
Some tape drives use a "Dip Switch" setting to control hardware compression. Here's the output error when COMPRESS_CONFLICT=HARD. lone-tar: NOTE: Both Software and Hardware compression were turned on!! To prevent problems, Software compression was turned OFF this session.
| 1. TAPE-TELL will read tape header *before* a backup
Variable Name = TAPETELL
|Default is "Y". By setting this variable to 'Y' will tell LONE-TAR scripts to execute 'tapetell' before each backup. If variable 'CD' does NOT equal '/', then TAPETELL should be set to 'N'. Tape-Tell is NOT supported for DEC 5000/240.
Here are more TAPE-TELL variables. Please read file 'Man_ttell' for more details.
| 2. Seconds to sleep *after* TAPE-TELL reads tape header
Variable Name = TT_SLEEP
|Default is "10". This is the number of seconds TAPE-TELL will 'sleep' after determining the status of your tape. These seconds will give the tape drive a chance to either reset itself or rewind.|
| 3. Abort CRON backup if most current tape
Variable Name = TT_cron_ABORT
|Default is "N". When set to 'Y' will cause your 'cron' nightly backup to abort should 'tapetell' determine you have your most current backup tape in the tape drive.|
| 4. Abort Menu backup if most current tape
Variable Name = TT_menu_ABORT
|Default is "N". Same as TT_cron_ABORT except it will interact with the user to show the backup is aborting.|
| 5. Rewind command after TAPE-TELL reads tape header
Variable Name = TT_REWIND
|Default is "OFF". Some older QIC tape drives may need a 'rewind' command sent after TAPE-TELL has finished sending a 'dd' command to the tape drive.|
| 6. Number of 512-byte blocks TAPE-TELL reads from tape
Variable Name = TT_BLOCK
|Default is "20". This value determines how many 512-byte blocks will be sent to the 'dd' command when 'tapetell' reads a tape label. There should be no reason to change this variable.|
| 1. Directory to save archive catalog files
Variable Name = TARDIR
|Default is "/log". Directory where LONE-TAR log files and Catalogs will be kept.|
| 2. Save historic archive catalog files
Variable Name = TARFILE
|Default is "blank". If set to "NONE" will allow only 1 CATALOG file will be kept beginning with "LAST_*".|
| 3. Compress historic archive catalog files
Variable Name = COMPRESS_LOGS
|Default is "Y". Will compress all the Catalog files except those whos names begin with 'LAST_*'. This will greatly reduce hard disk space used to store Catalog files.|
| 4. Purge historic archive catalog files
Variable Name = PURGE_LOGS
|Default is "Y". Historic Archive Catalog Files to purge in $TARDIR. When you select to [E]dit this variable, you will go to a menu that controls:
PURGE_BY=NUM # Purge by NUM or DAYS.
PURGE_M=10 # Retain how many Master Backup logs
PURGE_I=10 # Retain how many Incremental Backup logs
PURGE_S=10 # Retain how many Selective Backup logs
PURGE_V=10 # Retain how many Verify Backup logs
PURGE_R=10 # Retain how many Restore Backup logs
PURGE_L=10 # Retain how many Listing Backup logs
| 5. Minimum number of lines to keep of 'ltar.log'
Variable Name = LOG_KEEP
|Default is "2500". This is the number of lines to save in '$TARDIR/ltar.log'. Interacts with $PRUNE_LTAR_LOG.|
| 6. Catalog disk usage WARNING level
Variable Name = MAX_DU_WARN
|Default is "40000". Look at this variable as a warning system to inform you when you excede $MAX_DU_WARN 512-byte blocks of space being consumed by LONE-TAR Catalog filesystem to inform you when you exceed $MAX_DU_WARN 512-byte blocks of space being consumed by LONE-TAR Catalog files inside $TARDIR. Should you exceed $MAX_DU_WARN, then mail will be sent to $MAIL_TO advising you that the limit has been exceeded.|
| 7. Automatically generate TSS on failure
Variable Name = AUTO_TSS
|Default is "BOTH". This determines when to automatically generate a TSS [Tech Support Sheet] in the event there is a backup or verification failure. The script that gets executed is $LTAR_HOME/create.tss. Options are:
CRON - Only generate a TSS when 'cron' backups fail
MENU - Only generate a TSS when 'ltmenu' backups fail
BOTH - Generate a TSS from both a cron or menu backup
OFF - No TSS will be generated
| 8. Directory to hold temporay 'sort' files
Variable Name = SORT_TMP
|Default is "/usr/tmp". This is used exclusively by '/usr/lone-tar/mk.fs.index', which uses the 'sort' command. In the event there is not enough free space for 'sort' to create a tempory file, then simply change SORT_TMP to a partition with more free space.|
| 1. Mail summaries of LONE-TAR processes
Variable Name = MAIL_TO
|Default is "root". You can send mail to as many users as you like. The users MUST be valid login users. An example of 3 users to receive mail are as follows:
MAIL_TO="root jason jim". If set to OFF, then no mail will be sent to anyone. The summary file mailed is the last 18 lines of file '/log/ltar.log'.
| 2. Mail command
Variable Name = LMail
|Default is "mail -s". Should you elect to have logs mailed to you, then this will be the mail program used. This variable only has an effect if $MAIL_TO is NOT set to "OFF". See SUBJECT_INFO|
| 3. Set printer destination for printed output
Variable Name = Printer
|Default is "lp". This is the destination spooled printer. This could be set to lp, lp -dlaser, lp -ddefault... etc. WARNING: Do NOT specify a device here.... such as /dev/lp. All LONE-TAR scripts will pipe output to $Printer as follows:
cat file_name | $Printer
If $Printer is set to OFF, then no printing will occur.
In the unlikely event your printer output is stair-stepping (or zig-zagging), you should edit 'SEND_OUTPUT' and search for the string 'xtod'.
cat $TARDIR/tail.lp | xtod | $Printer # Use this line
# cat $TARDIR/tail.lp | $Printer # Comment OUT
WARNING: NEVER use a pipe sign inside the 'ltar.cfg'
# grep Printer /usr/lone-tar/ltar.cfg
Printer="lp -dhpjet" # <-- Yes
Printer="xtod | lp -dhpjet" # <-- NO
^^^^^^------------------- This belongs in SEND_OUTPUT
| 4. The editor to use within 'ltmenu'
Variable Name = EDITOR
|Default is "vi". Set this variable to whatever editor you wish to use. Vi is preferred.|
| 5. Display a summary of Log Files to a terminal
Variable Name = DISPLAY
|Default is "Y". By setting this variable to 'Y' will tell LONE-TAR scripts that you want backup and verify summaries sent to the terminal $TERMINAL (below). Will only effect 'cron' output summaries. ALL menu scripts ltar.*.tape have DISPLAY="N" hard coded in them. This means that even if you set DISPLAY="Y" here, DISPLAY is set to 'N' in ltar.*.tape. Why? The scripts ltar.*.tape are going to display regardless at whatever terminal you are using at the time you are running a backup or restore. No need to have it display twice. So look at this variable as a way to control ltar.*.cron ONLY.|
| 6. Display the summary of Log Files on this terminal
Variable Name = TERMINAL
|Default is "/dev/console". All the ltar.*.cron scripts will send output to $TERMINAL only if variable $DISPLAY is set to 'Y'. This will only effect your cron backups. It is important to have $TERMINAL turned on at night. If you turn off $TERMINAL when you leave work, cron may hang till you turn $TERMINAL on in the morning.|
| 7. Use PAGER to display paged screen output
Variable Name = PAGER
|Default is set to "more". If your system does not have the 'more' utility, you can set this variable to 'pg'. When output files are displayed to your screen the $PAGER variable is how it will be sent to your terminal.|
| 8. Reverse Video on LONE-TAR Menus
Variable Name = REV_VIDEO
|Default is "ON". This should be set to OFF only if you are experiencing trouble with the way the menus look on your screen. Sometimes an incorrect $TERM variable can cause this problem.|
| 8. Use COLOR for AIR-BAG Menu
Variable Name = DO_COLOR
|Default is "NO". This *only* affects AIR-BAG(tm) menu. Sometimes the AIR-BAG menus get weird colors. Setting this variable to "NO" fixes this problem.|
| 8. Append CATALOG purging results to 'ltar.log'
Variable Name = APPEND_UPDATE
|Default is "N". Triggered inside '$LTAR_HOME/ltar_after'. If set to 'Y' will *append* '$TARDIR/ltar.log' with one line summaries of PURGE, COMPRESS, INDEX and DU_WARN. This added info will become part of your daily printed VERIFICATION Success/Failure backup summary. It is recommended to leave this set to "N", and only set to "Y" if you are getting backup or verify failures. Output would look like:
PURGE: log.purge 12:46:14 ...Success!
COMPRESS: log.compress 12:46:14 ...Success!
MAKE_INDEX: mk.fs.index 12:46:14 ...Success!
PRUNE: prune.ltar.log 12:46:14 ...Success!
Check DU: log.du.warn 12:46:14 ...Success!
| 8. Notify about filenames containing White Space
Variable Name = REPORT_WHITE
|Default is "Y". This variable is used exclusively by 'mk.fs.index'. Should 'mk.fs.index' determine there are filenames on your computer that contain "white space" then mail will be sent to $MAIL_TO identifying the problem files. If you do NOT want to receive such email, then set this variable to "N". We suggest to leave it set to the default setting of 'Y'.
Please read FAQ-1135.
| 8. Additional Info for email subject header
Variable Name = SUBJECT_INFO
|Default is your LONE-TAR Serial Number -> "000000." Whatever is set here will be added to the email subject header. ie:
SUBJECT_INFO="000000." <-- Inside 'ltar.cfg'
000000.LONE-TAR..Verify..OK!!" <-- email subject header
LONE-TAR..Verify..OK!! <-- Without SUBJECT_INFO
This feature will be most useful for resellers that want to monitor several sites backup summaries via email. You can tell by the SUBJECT_INFO an account number, or a customer name. It is recommended that you put a dot or an underline as the last character. ie:
SUBJECT_INFO="000000_" <-- Yes
SUBJECT_INFO="000000." <-- Yes
SUBJECT_INFO="Store32." <-- Yes
SUBJECT_INFO="" <-- Yes
SUBJECT_INFO=" " <-- No
SUBJECT_INFO="000000" <-- No
SUBJECT_INFO="000000 " <-- No
WARNING: NO BLANK SPACES PLEASE.
| 1. Eject media command after backup/verify
Variable Name = EJECT_TAPE_CMD
|Default is "OFF". If set to anything else, will execute directly *after* a successful Backup and Verification. You would want to enter a command to EJECT a 4mm DAT or 8mm SCSI tape here. The most common command would be 'tape unload'. The actual code that does the ejection is inside source file '/usr/lone-tar/ltar_after'.|
| 2. Tape drive command to execute before a backup
Variable Name = XTRA_BACKUP
|Default is "OFF". If you wish to reset/rewind/retention a tape *before* a backup, then enter your 'tape reset' command here. Whatever you enter here will execute just *before* a BACKUP begins. When set to 'OFF' nothing will
happen. This variable is made available for certain tape drives that like to be tickled before having data written to them.
| 3. Tape drive command to execute before a verify
Variable Name = XTRA_VERIFY
|Default is "OFF". If you wish to reset/rewind/retention a tape *before* a verify, then simply enter your 'tape rewind' command here. Whatever you enter here will execute just *before* a VERIFY begins. When set to OFF
nothing will happen. This variable is made available for certain tape drives that like to be tickled before having data written to them.
| 4. Set support for LONE-TAR Built-in SCSI devices
Variable Name = SCSI_SUPPORT
|Default is "YES". Tells LONE-TAR that we can use the SCSI device drivers built into LONE-TAR.|
| 5. Device for Master backups
Variable Name = DEVICEM
|Default is null (blank). If this variable is set to nothing (""), then $DEVICE will be used. We added this variable so you could do a MASTER Backup to one tape drive, and an Incremental Backup to a different tape drive. Therefore, if you set DEVICEM="7", then a MASTER backup will write to device "archive7" in /etc/default/ltar.|
| 6. Device for Incremental backups
Variable Name = DEVICEI
|Same as $DEVICEM, except is used for INCREMENTAL Backups. If you set DEVICEI="9", then an INCREMENTAL backup will write to device "archive9" in /etc/default/ltar. Keep in mind that most users only have ONE tape drive. If you only have ONE tape drive, then you should leave DEVICEI set to null. When DEVICEI are set to nothing, then $DEVICE will be used for an Incremental backup.|
| 7. Device for Selective backups
Variable Name = DEVICES
|Same as $DEVICEM, except is used for SELECTIVE Backups. If you set DEVICES="9", then a SELECTIVE backup will write to device "archive9" in /etc/default/ltar. Keep in mind that most users only have ONE tape drive. If you only have ONE tape drive, then you should leave this variable set to null. When DEVICES is set to nothing, then $DEVICE will be used for a SELECTIVE backup.|