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HACMP

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Operating Systems AIX HACMP
# 1  
Old 07-23-2012
HACMP
Does anyone has idea about, what is the ibm standard HACMP trip interval?

We have 20 second.

Code:
lssrc -ls topsvcs
Subsystem         Group            PID     Status
 topsvcs          topsvcs          1843200 active
Network Name   Indx Defd  Mbrs  St   Adapter ID      Group ID
HB Interval = 1.000 secs. Sensitivity = 10 missed beats
Missed HBs: Total: 3 Current group: 0
Packets sent    : 2595710 ICMP 0 Errors: 0 No mbuf: 0
Packets received: 3364963 ICMP 0 Dropped: 0
NIM's PID: 1781806
HB Interval = 2.000 secs. Sensitivity = 5 missed beats
Missed HBs: Total: 0 Current group: 0
Packets sent    : 774925 ICMP 0 Errors: 0 No mbuf: 0
Packets received: 774962 ICMP 0 Dropped: 0
NIM's PID: 1908932
  2 locally connected Clients with PIDs:
haemd(1961990) hagsd(684036)
  Fast Failure Detection available but off.
  Dead Man Switch Enabled:
     reset interval = 1 seconds
     trip  interval = 20 seconds
  Client Heartbeating Disabled.
  Configuration Instance = 263
  Daemon employs no security
  Segments pinned: Text Data.
  Text segment size: 900 KB. Static data segment size: 1493 KB.
  Dynamic data segment size: 5249. Number of outstanding malloc: 158
  User time 135 sec. System time 152 sec.
  Number of page faults: 182. Process swapped out 0 times.
  Number of nodes up: 2. Number of nodes down: 0.

Last edited by Scott; 07-23-2012 at 05:07 PM.. Reason: Code tags
# 2  
Old 07-23-2012
Afaik 20 is the default.
This User Gave Thanks to zaxxon For This Post:
allwin
# 3  
Old 07-23-2012
Thank you. I got that.. But i want to know what is best practice or recommended value??
# 4  
Old 07-24-2012
Is there any need for you to tune it? I don't know about a best practice for it but leaving it to default until there might be any need for it to be tuned.
Did you have any problems with the Dead Man Switch? Responding too fast or too late or not at all?
This User Gave Thanks to zaxxon For This Post:
allwin
# 5  
Old 07-24-2012
Recent network change in our environment took more then 25 seconds. It is caused issue in cluster.

Secondary server took leadership since it is not get any response from primary.

But actually primary was up and running. After network established it is able to get response but already some of resources moved to secondary.

So primary is gone in to graceful shutdown.
# 6  
Old 07-24-2012
At the IBM Info Center there are some related articles about problems with DMS being triggered while everything is node-wise ok:
Help - AIX 6.1 Information Center: HACMP takeover issues

Check out especially:
Releasing large amounts of TCP traffic causes DMS timeout
Deadman switch causes a node failure
Deadman switch time to trigger
# 7  
Old 08-10-2012
Do you have any non-ip networks setup in your HACMP configuration? SAN heartbeat and/or Serial network heartbeat?

These would help discern between a true network problem or a node down problem.
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