Cisco Headend System Release 3.2 Guía Del Usuario
Chapter 2 Backup Recommendations
6
4013779 Rev C
Tape Considerations
Two Types of Tape
Consider the following issues when selecting the type of tapes to buy for the
backups:
You can back up your files to either a 4-mm or an 8-mm data tape. The type of
tape you choose depends upon the type of tape drive installed on your DNCS or
Application Server.
You can purchase 4-mm tapes or 8-mm tapes in various lengths. Refer to the
following chart, compiled by our engineers, for the specifications of the various
tapes available for use in your tape drives.
Tape Drive
Tape Length
(in meters)
Capacity
(normal/compressed)
(in Gbytes)
Tapesize
(in Kbytes)
Blocksize
(in Kbytes)
8 mm
54
2/4
4000000
16
8 mm
112
5/10
10000000
32
8 mm
160
7/14
14000000
128
4 mm DDS
90
2/4
4000000
16
4 mm DDS-2
120
4/8
8000000
32
4 mm DDS-3
125
12/24
24000000
128
4 mm DDS-4
150
20/40
40000000
128
4 mm DAT72 170
36/72
72000000
128
Buy the largest tapes that your tape drive supports.
Example: Buy 170m DAT72 tapes if you have a DAT72 tape drive; buy 150m
Example: Buy 170m DAT72 tapes if you have a DAT72 tape drive; buy 150m
DDS-4 tapes if you have a DDS-4 tape drive.
The backup scripts detect what tape drive your system uses and supplies default
parameters in preparation of running the scripts. The operator can override the
default values, at the command line, if desired.
Depending upon the size of your database, you may need more than one tape to
do a complete database backup. If you need more than one tape to back up your
database, the backup and restore scripts will prompt you to remove the existing
tape and to insert a new tape at the appropriate time.