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This
chapter will describe how to restore data from tapes on backup
server's side. First of all, we need to find data that we'd like to
restore. For example, if you want to restore /home of
server1.domain.com, login into backup server and run this command:
amadmin
DailySet1 info server1.domain.com /home
If
your system has been working properly, you should see:
Current info for server1.domain.com /home:
Stats: dump rates (kps), Full: 2186.8, -1.0, -1.0
Incremental: 1413.2, -1.0, -1.0
compressed size, Full: 88.2%,-100.0%,-100.0%
Incremental: 66.0%,-100.0%,-100.0%
Dumps: lev datestmp tape file origK compK secs
0 20070403 DailySet1-10 7 34495940 30409476 13906
1 20070517 DailySet1-59 124 3532300 2330312 1649
We
can see two backups done for directory /home. First with level 0 is
full backup and second one with level 1 is incremental backup. In
order to get most recent data, we need to extract both backups.
Exctracting includes two steps – loading tape and pulling data from
tape:
Lets
first load tape as shown below:
amtape
DailySet1 label DailySet1-10
Then
we can extract the archive using command amrestore:
amrestore
/dev/nst0 server1.domain.com /home
where:
/dev/nst0
is our tape drive.
Server1.domain.com
is our server's name
/home
is directory defined in disklist.
If
everything is fine, you should get the file server1.domain.com
._home.20070403xxxxx.0.1, which is tar archive compressed by gzip.
Then you need to extract this archive.
By
the next step, you need to extract increment backup of your data:
amtape
DailySet1 label DailySet1-59
amrestore
/dev/nst0 server1.domain.com /home
as
result, you should see file server1.domain.com._home.20070517xxxxxx,
which is also a tar archive compressed by gzip. By extracting into
the same directory where you have already extracted full backup, you
will get most recent data available on your backup system.
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