Veritas Storage Foundation 5.1 SP1 for Oracle RAC Administrator"s Guide (5900-1512, April 2011)

Table 5-3
LLT timer tunable parameters (continued)
Dependency with other
LLT tunable parameters
When to changeDefaultDescriptionLLT
parameter
This timer value should
always be lower than
peerinact timer value. Also,
It should be close to its
default value.
■ In some circumstances,
when the private
networks links are very
slow or nodes in the
cluster are very busy,
increase the value.
■ Increase the value for
planned replacement of
faulty network cable
/faulty switch.
400LLT marks a low-pri link of a
peer node as "troubled", if it
does not receive any packet
on that link for this timer
interval. Once a link is
marked as "troubled", LLT
will not send any data on that
link till the link is available.
peertroublelo
This timer value should be
lower than peertrouble timer
value. Also, it should not be
close to peertrouble timer
value.
In some circumstances, when
the private networks links
are very slow (or congested)
or nodes in the cluster are
very busy, increase the value.
50LLT sends heartbeat packets
repeatedly to peer nodes
after every heartbeat timer
interval on each high link.
heartbeat
This timer value should be
lower than peertroublelo
timer value. Also, it should
not be close to peertroublelo
timer value.
In some circumstances, when
the networks links are very
slow or nodes in the cluster
are very busy, increase the
value.
100LLT sends heartbeat packets
repeatedly to peer nodes
after every heartbeatlo timer
interval on each low pri link.
heartbeatlo
This timer is set to ‘peerinact
- 200’ automatically every
time when the peerinact
timer is changed.
Decrease the value of this
tunable for speeding up
node/link inactive
notification mechanism as
per client’s notification
processing logic.
Disable the request heartbeat
mechanism by setting the
value of this timer to 0 for
planned replacement of
faulty network cable /switch.
In some circumstances, when
the private networks links
are very slow or the network
traffic becomes very bursty,
don’t change the value of this
timer tunable.
1400LLT attempts to request
heartbeat mechanism
(explicitly sends 5 hbreqs,
special kind of heartbeat
requests to the peer node on
this link) if it did not receive
any packets on this link from
that peer node for this timer
interval. If the peer node
does not respond to the
special heartbeat requests,
LLT marks this link as
“expired” for that peer node.
Value can be set within range
starting from 0 to (peerinact
– 200). If this timer is set to
0, the request heartbeat
mechanism is disabled.
timetoreqhb
Tunable parameters
About LLT tunable parameters
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