Chapter 2. Implementation planning
51
Whether you use Table 2-14 or your own calculations, it is critical when designing
a Tivoli Storage Manager solution to measure the backup and potential restore
workload against the speed of your tape solution. In our earlier example, for
instance, we calculated that we needed to move 86.6 GB/HR to meet SLAs. So
based on the theoretical numbers above, a solution that is capable of that data
movement would take three LTO Gen 1 tape drives.
In addition to calculating backup workload, an architect must also consider
administrative processes and potential restores when deciding how many tape
drives a system needs. Each day, off-site copies of tapes must be made and
reclamation must occur. A potential restore of a large system could also require
multiple drives to meet SLAs.
A detailed discussion of specific I/O protocol speeds is beyond the scope of this
book. However, you should understand the speeds of the drive you choose and
recommendations for system connectivity. As a general rule, most hardware
vendors recommend no more than two to three tape drives per interface card
and, if using Fibre Channel, that tape traffic be separated from disk traffic.
The information in Table 2-15 will be used when sizing tape libraries and then
when defining them to Tivoli Storage Manager.
Table 2-15 Tape drive configuration worksheet
Sony AIT-3
12
100
33
150
Tape drive
Native speed
(MBps)
Native capacity
(GB)
Assumed speed
(GB/HR)
Assumed
capacity (GB)
Option
Library model
IBM System
Storage™ TS3310
Tape Library
Number of drives
2
Drive model
3580
Number of on-site tape volumes
19
Number of off-site tape volumes
29
Number of database volumes
6
Number of scratch tapes
9
Number of backup set tape volumes
5
Summary of Contents for E16RMLL-I - Tivoli Storage Manager
Page 2: ......
Page 23: ...Figures xxi 22 6 AIX lab environment 708...
Page 24: ...xxii IBM Tivoli Storage Manager Implementation Guide...
Page 32: ...2 IBM Tivoli Storage Manager Implementation Guide...
Page 44: ...14 IBM Tivoli Storage Manager Implementation Guide...
Page 94: ...64 IBM Tivoli Storage Manager Implementation Guide...
Page 96: ...66 IBM Tivoli Storage Manager Implementation Guide...
Page 126: ...96 IBM Tivoli Storage Manager Implementation Guide...
Page 298: ...268 IBM Tivoli Storage Manager Implementation Guide...
Page 354: ...324 IBM Tivoli Storage Manager Implementation Guide...
Page 356: ...326 IBM Tivoli Storage Manager Implementation Guide...
Page 423: ...Chapter 12 Scheduling 393 Week of Month Expire Never tsm quit...
Page 424: ...394 IBM Tivoli Storage Manager Implementation Guide...
Page 510: ...480 IBM Tivoli Storage Manager Implementation Guide...
Page 552: ...522 IBM Tivoli Storage Manager Implementation Guide...
Page 554: ...524 IBM Tivoli Storage Manager Implementation Guide...
Page 594: ...564 IBM Tivoli Storage Manager Implementation Guide...
Page 612: ...582 IBM Tivoli Storage Manager Implementation Guide...
Page 618: ...588 IBM Tivoli Storage Manager Implementation Guide...
Page 720: ...690 IBM Tivoli Storage Manager Implementation Guide...
Page 752: ...722 IBM Tivoli Storage Manager Implementation Guide...
Page 758: ...728 IBM Tivoli Storage Manager Implementation Guide...
Page 780: ...750 IBM Tivoli Storage Manager Implementation Guide...
Page 802: ...772 IBM Tivoli Storage Manager Implementation Guide...
Page 823: ...Index 793 Z z OS tape management 58 zOS 200...
Page 824: ...794 IBM Tivoli Storage Manager Implementation Guide...
Page 825: ...IBM Tivoli Storage Manager Implementation Guide...
Page 826: ......
Page 827: ......