Hardawer requirements for active standy pair

Could any one give some advices what requirements are needed to do the active standby pair replication?
I've configed an environment, but the a-s mode only work when active and standby ds are located in the same machines, if they are located in different machines, the standby machine's ds is always in "idle" state:(.
BTW,do we have any detail guide on how to config the active-standby and hardware environments required?
thanks!
Michael

Generally speaking, for an active/standby pair both machines should be pretty much identical since either will need to be able to cope with the expected application load. However, this is not a mandatory requirement.
The mandatory requirements for all* machines involved in a single replication scheme are that they:
1. Have the same type of CPU
2. Are running the same O/S and O/S version
3. Have the same version of TimesTen (cross version replication is supported while doing a rolling upgrade but is not supported for routione operational running)
Although replication may _work in configurations that do not comply with the above, it is not supported on such configurations.
You say you are getting a SEGV; what is SEGVing? If your configuration conforms to the above requirements and some TimesTen component is SEGVing then you should open an SR so that we can investigate this.
Chris

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Hi Chris, I had created ActiveStandby Pair as follows:
Server 1 => DSN: TTCluster1
Server 2 => DSN: TTCluster2.
Then I created ActiveStandby Pair in Server1, Started RepAgent and then Duplicated the DSN on Server 2 with name TTCluster 2. It worked fine.
Now to access it from the client server mode, I created Client DSN on Client machine using Virtual IP. (Using Linux Cluster Manager).
But inthis case I had to create two client DSN. TTCluster1Client and TTCluster2client. Since Application can connect to only one DSN and shifting to other while failover is very difficult.
So I am trying following model now, Let me know your views on this.
Server 1 and Server 2, both will have same DSN name "TTCluster".
Client Machin will have only one DSN "TTClusterClient" using VIP.
When the Server1 failes, Server 2 will take over and there is no need of shifting client DSN. Application will be routed to Server 2 after switch over.
Step1: created server DSN "TTCluster" on Server 1 and Server 2.
Step2: created user 'ttcluster' on Server 1 and Server 2.
Step3: Create DataStore TTCluster on Server 1. (By connecting to TTCluster).
Step4: Create Cache Groups (AWT) on Server1.
Step5: Started Cache Agent on Server1.
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CREATE ACTIVE STANDBY PAIR
TTCluster ON "wabtectimesten.patni.com",
TTCluster ON "wabtectimesten2.patni.com"
RETURN TWOSAFE
STORE TTCluster PORT 20000 TIMEOUT 120;
Step8: executed ttrepstateset('ACTIVE') on server1.
Step9: Started Replication Agent on Server1.
Step10: Duplicated DataStore on Server2.
Issues:
Server2 is not coming up as Standby. The log on Server1 shows following messages:
15:19:33.83 Warn: REP: 8671: TTCLUSTER:receiver.c(1723): TT16060: Failed to read data from the network. select() timed out
15:19:37.09 Err : REP: 8671: TTCLUSTER:receiver.c(3428): TT16142: Failed to retrieve peer information. No peers found
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While creating replication scheme I have mentioned.
STORE TTCluster PORT 20000 TIMEOUT 120;
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The above timeout will be applicable for which datastore??
Can you please let me know if I am going in the right direction???

Hi Tanweer,
When designing a monitoring scheme for TimesTen one has to bear a few things in mind (though not all will be relevant in every case):
1. There could be multiple 'instances' of TimesTen installed on a machine. Each instance is completely independent and must be monitoried separately.
2. Each instance has a 'main daemon' (timestend) that is the instance master supervisor. If this daemon is running and healthy then the 'instance' is considered to be 'up' and 'healthy'.
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- If a datastore goes down (e.g. call invalidate), other stores in the instance are not affected and neither is the main daemon for the instance. They will continue to operate normally.
- A datastore may be healthy in itself but maybe replication or cache connect for the datastore is not healthy. Do you then consider the datastore as down? That depends on your applications requirements!
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1. ps -ef | grep timestend. This can detect if the daemon process is running but not if it is healthy...
2. Connect to a datastore. Every connect/disconnect request is processed via the main daemon so if the daemon is not healthy this will result in some error (usually a 'cannot communicate with the daemon' error). However, connect/disconnect are relatively expensive so you don't want to do this too often.
3. Have a monitoring process that maintains an open connection to the instance level datastore (DSN=TT_<instancename>). Periodically (as often as required within reason) it can execute the built in procedure ttDataStoreStatus() passing it the pathname of the instaance datastore checkpoint files (obtainable from the built in procedure ttConfiguration). This procedure communicates with the main daemon so will either return success (meaning daemon is okay) or an error (daemon is in big trouble).
If you have to do the test from a script then I would suggest that (2) is best but if you can do it from a continually running monitoring process then (3) is better.
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1. Have a dummy table in the datastore. And as part of the check update a row in th dummy and commit the transaction. If this returns success then this shows that the datastore is up and able to service update requests (which means it is also okay for read requests).
2. You should also monitor the available space in the datastore and warn someone or something if the free space gets too low. You can query space allocation, current usage and high watermark usage from the SYS.MONITOR table. You can also configure TimesTen to generate SNMP traps and/or return warnings to applications if space usage exceeds some configured threshold. The objective is to take proactive action to prevent the datastore becoming full since that will require more disruptive corrective action.
For monitoring replication you should periodically:
1. Check that the datastore's repagent is running (you can do this using ttDatastoreStatus)
2. Check the status of each replication peer by calling ttReplicationStatus and checking the values of pstate (should be 'start') logs (if this value increases over time then the peer is in some kind of trouble) and lastMsg (if there is no message from the peer for a long time then it may be in some kind of trouble).
3. Sometimes an easier way is to have a dummy table set up for synchronous replication and do an update+commit for a row in that table. if replicatioin is working the commit will return within a few ms at most. If you get a timeout error returned that tells you that replication is in trouble,
To monitor cache connect is not so easy at present.
For AWT cache groups, the same monitoring as is used for replication is okay).
For SWT cache groups, if the sync to Oracle is not working every commit will get an error (so that's kind of obvious).
For AUTOREFRESH cache groups it's a bit harder. There is currenyly no supported way to determine when the last successful autorefresh occurred. I am hoping this capability will be added in a future release.
Sorry if that is a bit long winded - I hope it helps...
Chris

Hardawer requirements for active standy pair

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