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IDS Forum

SDS Server disconnecting after blocking on checkpo

Posted By: Henri MOUKOURI
Date: Monday, 4 October 2010, at 10:55 a.m.

Hi,

I am facing a serious problem with a SDS server disconnecting
from the primary on checkpoint.

I've tried to set different values for SDS_TIMEOUT, CKPINTVL.
I also tried to use the RTO functionality, put the secondary on
Read-Only mode, without success.

Both servers were working quite well after installation. Then, one day
the secondary disconnected and started this stranger behaviour.

Can any one help ?

Please find hereafter some informations relating to the
case (I'll send more if requested ) :

*1/ Primary online.log (extract) *:

10:55:05 IBM Informix Dynamic Server Started.

10:55:21 Segment locked: addr=700000000000000, size=11206705152
10:55:37 Segment locked: addr=7000002a0000000, size=10485760000
10:55:38 VP pid=565296 priority fixed at 60, former = 90

10:55:39 Affinitied VP 1 to phys proc 0
10:55:39 Affinitied VP 3 to phys proc 1
10:55:39 Affinitied VP 4 to phys proc 2
10:55:44 DR: DRAUTO is 0 (Off)
10:55:44 DR: ENCRYPT_HDR is 0 (HDR encryption Disabled)
10:55:44 AIX MP latch code enabled
10:55:44 Fast poll pollset enabled.
10:55:44 Requested shared memory segment size rounded from 2680KB to 2688KB
10:55:44 IBM Informix Dynamic Server Version 11.50.FC4 Software Serial Number AAA#B000000

10:55:45 DR: Reservation of the last logical log for log backup turned on
10:55:45 SDS Source Node Alias Changed from (svrprd) to (svrprd)
10:55:45 IBM Informix Dynamic Server Initialized -- Shared Memory Initialized.

10:55:45 DR: Reservation of the last logical log for log backup turned on
10:55:45 Physical Recovery Started at Page (3:4926569).
10:55:46 Physical Recovery Complete: 0 Pages Examined, 0 Pages Restored.
10:55:46 Logical Recovery Started.
10:55:46 10 recovery worker threads will be started.
10:55:47 Logical Recovery has reached the transaction cleanup phase.
10:55:47 Logical Recovery Complete.

0 Committed, 0 Rolled Back, 0 Open, 0 Bad Locks

10:55:48 Dataskip is now OFF for all dbspaces
10:55:48 Checkpoint Completed: duration was 0 seconds.

10:55:48 Maximum server connections 0
10:55:48 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 2, Llog used 1

10:55:48 On-Line Mode
10:55:50 SCHAPI: Started dbScheduler thread.
10:55:50 Booting Language <spl> from module <>
10:55:50 Loading Module <SPLNULL>
10:55:50 SCHAPI: Started 2 dbWorker threads.

10:59:55 Maximum server connections 8
10:59:55 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 5745, Llog used 1494

10:59:56 SDS Server srvsds - state is now connected
12:11:58 Checkpoint Completed: duration was 1 seconds.

12:11:58 Maximum server connections 40
12:11:58 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 10477, Llog used 11782

12:27:03 ERROR: Removing SDS Node srvsds has timed out - removing
12:27:03 ERROR: Removing SDS Node srvsds has timed out - removing
12:27:03 SDS Server srvsds - state is now disconnected

*2/ Secondary online.log (extract)
*
10:59:10 IBM Informix Dynamic Server Started.

10:59:26 Segment locked: addr=700000000000000, size=11206705152
10:59:41 Segment locked: addr=7000002a0000000, size=10485760000
10:59:42 VP pid=327898 priority fixed at 60, former = 90

10:59:43 Affinitied VP 1 to phys proc 0
10:59:43 Affinitied VP 3 to phys proc 1
10:59:43 Affinitied VP 4 to phys proc 2
10:59:48 DR: DRAUTO is 0 (Off)
10:59:48 DR: ENCRYPT_HDR is 0 (HDR encryption Disabled)
10:59:48 AIX MP latch code enabled
10:59:48 Fast poll pollset enabled.
10:59:48 Requested shared memory segment size rounded from 2680KB to 2688KB
10:59:48 IBM Informix Dynamic Server Version 11.50.FC4 Software Serial Number AAA#B000000
10:59:53 Setting checkpoint 986:15ede018 intvl:5695
10:59:53 SDS Server svrprd - state is now connected
10:59:54 IBM Informix Dynamic Server Initialized -- Shared Memory Initialized.

10:59:54 Requesting logs from 986:15ede
10:59:54 Initializing SDS Temp dbspace tempspace1
10:59:54 Dataskip is now OFF for all dbspaces
10:59:54 Restartable Restore has been ENABLED
10:59:54 Recovery Mode
10:59:54 Logical Recovery Started.
10:59:54 10 recovery worker threads will be started.
10:59:55 Initializing SDS Temp dbspace tempspace2
10:59:55 Start Logical Recovery - Start Log 986, End Log ?
10:59:55 Starting Log Position - 986 0x15ede018
10:59:55 B-tree scanners disabled.
10:59:56 DR: SDS secondary server operational
10:59:56 Started processing open transactions on secondary during startup
10:59:56 Checkpoint Completed: duration was 0 seconds.

10:59:56 Maximum server connections 0
10:59:56 Finished processing open transactions on secondary during startup.
12:11:06 Logical Log 986 Complete, timestamp: 0x8d08cd48.
12:11:56 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 10189, Llog used 0

12:27:02 SDS: Received Shutdown request from svrprd, Reason: onmode -d clear SDS primary command was run at Primary
12:27:02 DR:Shutting down the server.
12:27:02 IBM Informix Dynamic Server Stopped.

Of course, nobody ran "onmode -d clear SDS primary" on primary. I fact the
secondary stops without any user action.

Once again, please help !!!

Henri MOUKOURI

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