Configuring HP SIM for Optimal Performance in Large Environments
8
Note:
Do
not
let
status
polling
tasks
overlap.
Time
the
Server
Polling
taskcompletion
time
by
making
sure
the
interval
is
longer
than
the
completion time.
Changing
Timeouts
and
Retries
HP
SIM
uses
Ping,
TCP,
and
HTTP,
WBEM,
and
SSH
protocols
to
determine
if
a
system
is
on
the
network.
During
the
communication
phase
of
discovery,
you
can
customize
several
items
to
conform to
your
network
environment
including
Ping,
SNMP
Retries,
and
Timeouts.
HP
SIM
is
tailored,
out-of-the-box,
for
a
LAN
configuration.
In
many
companies,
the
network
has
both
LAN
and
wide
area
network
(WAN)
components.
To
ensure
good
communication
over
a
WAN,
you
must
consider
network
latency.
First,
customize
Network
Timeouts.
If
systems
are
not
being
discovered
through
pinging,
or information
is
not
being
collected
for
a
specific
system
over
a
WAN
using
SNMP,
you
must
increase the
Ping
Timeouts
setting.
To
customize
HP
SIM
to
your
environment,
begin
by
investigating
how
other
applications
are
tailored to
communicate
over
your
network.
You
can
try
increasing
the
Timeouts
by
a
factor
of
20
percent.
For
example,
by
default
SNMP
Timeouts
are
set
to
5
seconds.
First
increase
the
value
to
(5
*
1.2)
6
seconds.
If
this
still
does
not
enable
you
to
discover
a
particular
system,
increase
it
to
(6*1.2)
8
seconds.
Note:
Setting
timeouts
greater
than
10
to
20
seconds
can
cause
the
various polling
tasks
in
HP
SIM
to
take
much
longer
to
complete.
In
a
mixed
system latency
environment,
it
is
best
to
adjust
timeouts
and
retries
for
the
slower-
responding
systems
using
groups
(such
as
LAN/WAN)
and
not
through
the
default
settings
on
the
Discovery
page.
After
a
system
is
discovered,
you
can
view
a
collection
that
contains
that
system
and
drill
down
to
the
System
Page
window.
From
this
window,
you
can
further
customize
SNMP
timeouts
for
that
specific
system.
After
you
change
the
value
for
that
system,
all
tasks
use
the
new
timeout
(or
retry)
when
communicating
with
that
particular
system.
If
your
network
has
latency
(WAN)
problems,
timeouts
is the
best
communication
item
to
fine-tune.
If
you
are
experiencing
packet
loss
with
low
latency networks,
timeout
retries
is
the
best
item
to
customize
(keep
the
current
timeout
values).
HP recommends
that
you
set
the
minimum
number
of
retries
to
one.
Zero
retries
can
result
in
packet
loss and
false
notification
of
unreachable
systems.
HP
SIM
is
designed
so
that
if
a
request
is
sent
out
and
the
reply
is
received
after
the
timeout
period, the
reply
is
ignored.
Therefore,
you
must
tailor
timeouts
before
retries.
Increment
retries
only
in
single
values.
For
example,
if
the
default
ping
retries
value
of
1
is
not
adequate
for
your
system,
the
next
attempt
must
be
2.
System
and
event
management
Customizing
the
query
system
The
collections
feature
of
HP
SIM
enables
you
to
generate
information
about
a
subset
of
systems
or
a
group.
You
can
then
perform
tasks
on
all
of
the
systems
in
that
group
with
one
collection.
Several
default
collections
enable
you
to
see
collected
information
from
the
database.