Table 2. Mount performance for drives in a TS3500 Tape Library with dual accessors but
without HD frames
Library Configuration
(Active Frames
1
)
Mounts Per Hour
2
8 frames
800
12 frames
700
16 frames
600
Notes:
1.
Active frames are all frames in a dual-accessor library except service bay frames.
2.
Specifications were produced from models, but are consistent with test results. This
data assumes that the library is partitioned into at least two logical libraries, such that
each of the cartridges located in the two zones are mounted in drives within each zone
with no accessor path overlap. Detailed performance data and tips about maximizing
the performance of a TS3500 Tape Library are available in the
IBM TotalStorage 3584
Tape Library Performance
white paper. For information about this document, contact
your IBM Representative.
In order to understand how HD frames affect mount performance and cartridge move time,
refer to
HD frame performance considerations
Parent topic:
Import and export performance with virtual I/O slots
This section describes import and export performance in the TS3500 Tape Library with
virtual I/O slots enabled.
Virtual I/O slots increase the quantity of available I/O slots by allowing storage slots to
appear to the host as I/O slots. With virtual I/O slots, the library automatically moves
cartridges between the I/O stations and the storage slots. In this way, the library enhances
its import and export capabilities.
Imports per hour and average I/O station drain time can vary depending on whether a
library has single or dual accessors, and whether the library has HD frames.
Imports per
hour
is defined as the average number of cartridges imported in one hour.
Average I/O
station drain time
is defined as the time it takes one active accessor to import 16 cartridges
from one I/O station into the library. Both specifications assume there is no other activity in
the library.
