Changes between Version 1 and Version 2 of Backing up Sun Directories

Timestamp:

04/03/06 16:58:54 (20 years ago)

Author:

cdelarcuz

Comment:

--

Backing up Sun Directories

@@ -1 +1 @@
 == Backing up Directories ==
 
-Notes for backing up directories can be found [http://www.astro.columbia.edu/~crussell/computing/notes/backup.note here].
+ Sample commands to tar files to tape.          ( See /nfs/man/notes/solaris_tape.note 
+                                                        for info on tape drives.)
+
+ Note:  **Commands below to create tar files will not follow any links - just the 
+          link  file will be copied unless use the h switch.
+          Also when extracting tar files, not all mode settings will be preserved unless
+          use the p switch.**
+        **To put more than one tar file per tape, use device name /dev/rmt/0n(n=norewind)
+          and also the 'mt'  command to position the tape past the last tar file written.
+          See 'man mt'. and example 4) below.**
+
+ 1) > cd /home/my_directory
+    > tar cvf /dev/rmt/0 .              (will put all files and subdirectories found
+                                         in my_directory on the tape and rewind 
+                                         the tape)
+    > cd /home/my_directory/subdirectory
+    > tar xvf /dev/rmt/0                        (will extract all files and subdirectories 
+                                         from the tar file on the tape and put them 
+                                         in the current directory)
+
+ 2) > cd /
+    > tar cvf /dev/rmt/0  usr  home       (will put directories usr and home
+                                         and all subdirectories of usr and home on the 
+                                         tape and rewind the tape)
+    > cd /tmp
+    > tar xvf /dev/rmt/0        home            (will extract directory home and all its 
+                                         subdirectories to the current directory)
+
+3)  Not a good idea to make a tar file from data begining with '/', for instance:
+        tar cvf /dev/rmt/0  /home/carmen/wilds  
+    If you try to restore this, you will get permission denied errors.
+    Instead, do:
+        cd /home/carmen/wilds
+        tar cvf /dev/rmt/0 .
+
+4)  To add data to a backup tape without overwriting its current contents:
+
+        > mt -f /dev/rmt/0n eom         (will space out past the EOF mark)
+        > tar cvf /dev/rmt/0hn  . > /tmp/newbackup.log &
+                                        (will backup the current
+                                         directory and all
+                                         subdirectories below in
+                                         compressed mode without
+                                         rewinding first)
+See also:
+
+ Sample script to dump a file system to tape.
+ 
+ Script below copies four file systems to the same tape.  A typical 8mm tape 
+ cartridge holds 5.0GB or 10GB in compressed mode.  
+
+
+ Use command:    % ufsrestore -if /dev/rmt/0n 
+ to retrieve a file from a 'dump' tape later on.  The ufsrestore command is 
+ convenient to use, see manual pages.
+           
+#! /bin/csh
+#
+# Script ufsdump_alceste                      ***Note: Solaris 2.4 man ufsdump
+#                                                says can detect end-of-media
+#                                                so can use without s(size)
+#                                                and d(density) parameters.
+#       dump filesystems:
+#                / /usr /usr/openwin /var /opt /home /var_ /src1 ......
+#       from alceste to local 10GB 8mm tape.
+#
+set d = `date`
+set bkup = /var/backup/alceste_m.log_{$d[2]}{$d[3]}{$d[6]}
+#
+echo Backup of alceste > $bkup
+date >> $bkup
+echo using ufsdump_alceste >> $bkup
+#
+echo Done on `date` >> $bkup
+#mt -f /dev/rmt/0cn eom                 # will take past last file written on tape.
+mt -f /dev/rmt/0c rewind
+mt -f /dev/rmt/0cn status >> $bkup
+
+#echo Tape at eom >> $bkup
+#
+echo ' ' >> $bkup
+ufsdump 0f  /dev/rmt/0cn /  >>& $bkup
+date
+echo ' ' >> $bkup
+ufsdump 0f  /dev/rmt/0cn /home  >>& $bkup
+date
+echo ' ' >> $bkup
+ufsdump 0f  /dev/rmt/0cn /src1  >>& $bkup
+date
+echo ' ' >> $bkup
+ufsdump 0f  /dev/rmt/0cn /src2  >>& $bkup
+date
+#
+echo ' ' >> $bkup
+# 
+mt -f /dev/rmt/0c rewind
+date >> $bkup
+
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