Creating data store hits reports, What this report tells you – HP StorageWorks Enterprise File Services WAN Accelerator User Manual
Page 139
HP S
TORAGE
W
ORKS
EFS WAN A
CCELERATOR
M
ANAGEMENT
C
ONSOLE
U
SER
G
UIDE
139
3 - C
RE
A
T
IN
G
H
P
EFS W
AN
A
CCE
LE
RAT
OR
R
EP
O
R
T
S
AN
D
3. Select Last 5 minutes, Last Hour, Last Day, Last Week, or Last Month from
the Period drop-down list.
TIP: To refresh your report every 15 seconds, click 15s. To refresh your report every 30
seconds, click 30s.
TIP: To print your report, click the Printer icon in the upper right corner of the page.
Creating Data
Store Hits
Reports
The Reports: Performance - Data Store Hits page 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.
Hits in Memory
Specifies the total number of hits in memory. With a mem-
ory hit, the HP EFS WAN Accelerator can quickly reference
the data, whereas with a disk hit, the data segment is not in
memory and the segment must be accessed from disk rather
than memory.
Hits in Disk
Specifies the number of hits to the data store disk.
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 com-
pression is enabled. For detailed information about setting
optimization policies, see
“Setting Optimization Policies” on
.