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15.9.3 Large File Parallel
For the measurements in this environment, BRMS was used to manage the save and restore, taking
advantage of the ability built into BRMS to split an object between multiple tape drives. Starting with a
320 GB file in a single library and building it up to 2.1 TB for tape drive tests 1 - 4 and 8. The file was
then duplicated in the library for tape drive tests 12 - 16, a single library with two 2.1 TB files was used.
Not quite the same as having a 4.2 TB file. Because of certain limitations in building our test data, we
felt this was the best way to build the test data. The goal is to see scaling of tape drives on the system
along with trying to locate any saturation points that might help our customers identify limitations in their
own environment.
3.65
TB/HR
3.55
TB/HR
3.35
TB/HR
3.14
TB/HR
2.95
TB/HR
1.90
TB/HR
1.23
TB/HR
936
GB/HR
613
GB/HR
340
GB/HR
R
4
TB/HR
3.90
TB/HR
3.71
TB/HR
3.60
TB/HR
3.29
TB/HR
2.1
TB/HR
1.34
TB/HR
997
GB/HR
641
GB/HR
363
GB/HR
S
161514131284321
#
3580.002
Tape
drives
Table 15.9.3.1 iV5R2 16 - 3580.002 Fiber Channel Tape Device Measurements (Parallel)
(Save = S, & Restore = R)
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 15. Save/Restore Performance 251
4 TB/HR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
# 3580 model 002 Tape Drives
0
1
2
3
4
5
TB/HR
Save
Restore
Save and Restore Rates
Large File Parallel Runs