HP Library and Tape Tools - Manual (Page 120)

Understanding STTF support ticket
Tape drive creates a snapshot log in volatile memory and saves it to an area of non-volatile memory
(flash). To generate STTF log, configure the trigger conditions. The STTF Configuration list contains
the descriptors that define the configurable STTF trigger conditions for creating a snapshot log and
the Command Set used to create the log. Snapshot logs are stored in a single area of contiguous
memory. STTF logs are stored in two equally sized regions of flash that are not contiguous and
they cannot span across the two regions. These two flash regions do not correlate directly to the
configurable flash sections, but they must be correlated to effectively utilize the available flash
memory.
The physical size of each of the two flash regions is STTF_MAX_SIZE(4915200 byte), but the
Snapshot sub-system manages these regions into two logical sections. Each of these logical sections
can be independently sub-divided to store multiple STTF logs. This allows one section to store STTF
logs from a number of specified command sets and the other section to store STTF logs from all
other command sets. This also allows the flash to be utilized efficiently, because STTF logs created
using the Drive Health Command Set are significantly smaller than those created using the Debug
Command Set. If only one command set is used, or all STTF logs are expected to be of similar size,
then the size of the second flash section might be set to zero.
Figure 45 STTF support ticket screen
120 Reports and support tickets