HP StorageWorks Enterprise File Services WAN Accelerator - Manual (Page 131)

HP S TORAGE W ORKS EFS WAN A CCELERATOR M ANAGEMENT C ONSOLE U SER G UIDE 131
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Creating Data
Store Hits
Reports
The Performance - Data Store Hits report summarizes how many times the HP EFS
WAN Accelerator data-store disk and memory have seen a data segment. A hit is a data
segment that has been seen before by the data store in the HP EFS WAN Accelerator.
If a hit has occurred, Scalable Data Referencing (SDR) sends the reference to the data
segment rather than the actual data over the WAN.
The Data Store Hits report contains the following table of statistics that summarize
data store activity.
What This Report
Tells You The Data Store Hit Rate report answers the following questions:
‹ How much SDR optimization is occurring?
‹ How much SDR optimization occurred through disk hits?
‹ How much SDR optimization occurred through memory hits?
‹ How much data traversed the WAN without SDR optimization?
Field Description
Total Hits over Last Week Specifies the total number of hits against the data store. A hit
is a data segment that has been seen before by the data store
in the HP EFS WAN Accelerator. If a hit has occurred, SDR
sends the reference to the data rather than the actual data
over the WAN.
Misses Specifies the number of misses that occurred. A miss is an
unmatched data segment—the data store has not seen the
data segment before and must send all the data across the
WAN. The data is Lempel-Ziv (LZ) compressed if LZ
compression is enabled. For detailed information about
setting optimization policies, see
“Setting In-Path Rules” on
page 25 .