HP StoreEver TapeAssure Software - Manual (Page 79)

compression setting of the drive, and whether the backup application has prevented media
removal.
•
In the Interface section, verify that the negotiated burst rate is as expected. This value should
match the data shown for the interface controller in the Drive Identity section (the name of the
controller generally indicates the maximum speed that the interface can handle).
Environment
This section shows temperature data for the drive. Verify that all temperatures shown are within
normal limits.
Performance
This section shows burst performance figures for the drive, and estimated native performance
figures for the last four tapes.
•
Maximum data rates show the highest rate that the data compression engine has seen. Figures
are high because of buffering. These values show the maximum possible rates with very high
compression ratios.
•
Average data rates before compression are what the host has seen. Average rates after
compression are the native rates for the tape.
•
Write and read compression ratios are calculated over the same data. These figures are reset
on tape load, in which case Unknown is shown.
•
Performance figures are estimated from various drive logs.
Usage
This section shows usage data for the drive since it was new, as well as the amount of data
transferred over the current and previous four tapes.
The Tape pulled item is expressed in full volume equivalents as that is closest to a customer model.
HP media documentation also uses this unit.
History
This section displays drive logs that show what the drive has been doing. The event log shows
high-level information on commands received, internal processing, and any errors returned to the
host (including tape alert information). The event log also includes history from Device Analysis
and Drive Assessment tests. The times shown are relative to the last power on.
LTO media
This section displays information on the currently loaded tape (header displays loaded tape), or
the tape that was loaded last (header displays ejected tape). If you are using genuine HP media,
more information is displayed in this section than would be with non-HP media.
This section has several sections and sub-sections:
•
The Identity section shows the identity of the media. Note that the Barcode item is not used
by all products.
•
The Health section is split into three sections:
The Data on tape section shows margin measurements for the data on the tape. Data on
tape is written in wraps where each wrap is a pass up or down the tape. Each generation ◦
of LTO has a different number of wraps. Each wrap has a measure of margin revealing
any bad spots on the tape. The summary line (top line of the section) highlights the worst
margin found and should be used for a measure of minimum quality of the whole tape.
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