IBM System Storage TS3500, Manual

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Table 1 shows the imports per hour and average I/O station drain time using one active
accessor in a TS3500 Tape Library with virtual I/O slots enabled, but without HD frames.
Table 2 shows imports per hour in a TS3500 Tape Library with dual active accessors and
virtual I/O slots enabled, but without HD frames.
Table 1. Specifications for imports per hour and average I/O station drain time for a TS3500
Tape Library using one active accessor
Library
configuration
I/O station in frame 1 I/O station in center frame
Imports
per hour 1
Average I/O Station
Drain Time (in
Seconds) 1
Imports
per hour 1
Average I/O Station
Drain Time (in
Seconds) 1
1 frame 829 69 N/A N/A
2 frames 725 79 N/A N/A
4 frames 640 90 678 85
6 frames 585 98 639 90
8 frames 536 107 603 95
12 frames 466 123 556 103
16 frames 412 139 513 112
Notes:
1. The following library setup was used to obtain the stated performance data:
• ALMS and virtual I/O slots are enabled
• Cartridge assignment policy is setup for each logical library
• No HD frames
Table 1 lists the specifications for import performance only. Export performance is designed
to be within 20% of import performance when cartridges are being exported from tier 0 and
tier 1 slots. In other words, for recently used cartridges and all cartridges in non-HD frames,
exports per hour will be between 80% to 100% of imports per hour, and average I/O
station fill time will be between 100% to 120% of the average I/O station drain time.
Table 2. Specifications for imports per hour for a TS3500 Tape Library with dual active
accessors and I/O Stations in both accessor zones
Library configuration (active frames) 1 Imports per hour 2,3
4 frames 1400
6 frames 1300
8 frames 1200
12 frames 1100
16 frames 1000
Notes: