HP StoreEver TapeAssure Software - Manual (Page 105)

Figure 44 Multiple tests for each tape speed
The error rate tests for each direction cover different parts of the tape and are run at different
speeds, as shown in
(page 105) . This allows the test to characterize the drive for each direction,
testing each set of heads.
Figure 45 Multiple tests run in each direction
The pass/fail criteria are the same as for the support ticket — the drive must be able to write high
quality data using no more than 20% additional tape to do so. Note that a drive will still work
well even if it needs 50% additional tape but the figure of 20% is used to allow for a little wear
and still leave a great deal of margin.
The output, if the Everything detail level is selected, shows the characterization of the drive,
first by tape speed and then by direction.
||_ 1.8 m/sec. tape speed:Effective capacity:94.8% Margin: 98.6% (3.0/3.0 GB written using 170.4 meters of
tape)
||_ Channel variation: 0.0% Channel variation margin: 100.0%
||_ Offtrack count: 0 CCQ rewrite percent: 0.1%
||_ 2.1 m/sec. tape speed:Effective capacity:94.8% Margin: 98.4% (3.0/3.0 GB written using 170.5 meters of
tape)
||_ Channel variation: 0.0% Channel variation margin: 100.0%
||_ Offtrack count: 0 CCQ rewrite percent: 0.1%
||_ 2.4 m/sec. tape speed:Effective capacity:94.7% Margin: 98.1% (3.0/3.0 GB written using 170.6 meters of
tape)
||_ Channel variation: 0.0% Channel variation margin: 100.0%
...
...
||_ 3.5 m/sec. tape speed:Effective capacity:94.7% Margin: 98.4% (3.0/3.0 GB written using 128.0 meters of
Diagnostic tests 105