Cisco Headend System Release 2.5 Guia Do Utilizador
4001155 Rev B
Backup Recommendations
2-3
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 Cisco 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
3774874
16
8 mm
112
5/10
9437184
32
8 mm
160
7/14
13212058
128
4 mm
90
2/4
3774874
16
4 mm
120
4/8
7549747
32
4 mm
125
12/24
22649242
128
4-mm
150
20/40
36864000
128
•
The rows shaded in gray represent Cisco’s recommendations.
−
−
If you use an 8-mm tape drive, buy tapes that are 160 meters long.
−
If you use a 4-mm tape drive, buy tapes that are 125 meters long.
•
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.
Cleaning Your Tape Drive
Under normal conditions, most tape and tape drive manufacturers recommend that
you clean your tape drive after about 30 hours of data transfer. Use only a cleaning
cartridge and kit designed for use with your tape drive. Discard your cleaning
cartridge after using it for the number of cleaning cycles specified in the cleaning kit
documentation.