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IDS Forum

Enterprise Replication recovery slow on Solaris

Posted By: JEFFREY GENEGA
Date: Thursday, 21 March 2013, at 10:27 a.m.

Hello,

I have an Enterprise replication environment where the primary is running SunOS 10 and the backup is AIX 6.1, both running IBM Informix Dynamic Server Version 11.70.FC5GE. I purposely interrupted communications between the primary and backup for about 12 hours, then re-established the connection. In this time, I estimate that my application added maybe 10 GB of data to the database on the primary. After reconnecting the machines, I shut down all of my apps so that no new data is being inserted or deleted from the database. The purpose of this is to see how long it takes for the replicated data to propagate to the backup from the primary. After 1 day, the databases still were not in sync, so I manually did a row count of the tables being replicated on the primary and backup. The primary has about 54 million rows and, at the beginning of day 2, the backup had 38 million rows. At the beginning of day 4 the backup had about 44 million rows. So, with 6 million rows in 2 days and another 10 million rows to go, I estimate about another 3 days, making the entire recovery of 10 GB taking 7 days. This is too long, and I am thinking that this must be some kind of SunOS tuning issue.

On a possibly related note, both machines were synced up from the database of a third machine before this test began using dbimport. It took 2 hours to dbimport the AIX machine and 8 hours to dbimport the same data onto the Solaris machine.

Some info for the SunOS machine:
- The onconfig file has VPCLASS cpu,num=16,noage.
- The OpenAdmin Tool shows no recommended changes to the configuration.
- The OAT shows the following Server Info:

Server Type: Standard
Version: 11.70.FC5GE
Server Time: 09:45:04
Boot Time: 2013-03-19 13:08
Up Time: 1 days 20:36:50
Sessions: 3
Max Users: 544
Operating System
Total Mem: 15.9 GB
Free Mem: 376 MB
# of CPUs: 32

(I restarted informix 2 days ago to tweak some onconfig settings.)

- Other than informix, nothing is running on either the primary or

the backup.
- As of the last informix restart, the online log shows no errors of

any kind, everything is looking normal.

A prstat shows the following on the primary (5 seconds apart):

PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
5837 informix 2796M 2365M sleep 59 -10 8:36:57 0.4% oninit/17
5844 informix 2796M 2350M sleep 52 -10 8:18:56 0.5% oninit/19
5851 informix 2796M 2350M sleep 59 -10 5:09:33 0.1% oninit/18
5852 informix 2796M 2349M sleep 59 -10 4:35:21 0.0% oninit/19
5846 informix 2796M 2347M sleep 59 -10 7:44:28 0.5% oninit/18
5847 informix 2796M 2346M sleep 59 -10 7:25:23 0.6% oninit/17
5845 informix 2796M 2346M sleep 52 -10 7:58:06 0.4% oninit/18
5850 informix 2796M 2345M cpu38 30 -10 6:20:15 0.5% oninit/21
5848 informix 2796M 2343M sleep 59 -10 7:08:30 0.6% oninit/17
5849 informix 2796M 2343M sleep 59 -10 6:49:08 0.4% oninit/18
5853 informix 2796M 2342M sleep 59 -10 4:14:47 0.0% oninit/19
5857 informix 2796M 2337M sleep 59 -10 3:19:36 0.0% oninit/17
5854 informix 2796M 2334M sleep 59 -10 3:52:52 0.0% oninit/17
5855 informix 2796M 2334M sleep 59 -10 3:34:57 0.0% oninit/18
5856 informix 2796M 2332M sleep 59 -10 3:26:08 0.0% oninit/19
=====

PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
5837 informix 2796M 2365M sleep 59 -10 8:36:57 0.3% oninit/17
5844 informix 2796M 2350M sleep 30 -10 8:18:58 0.6% oninit/19
5851 informix 2796M 2350M sleep 59 -10 5:09:33 0.1% oninit/18
5852 informix 2796M 2349M sleep 59 -10 4:35:21 0.0% oninit/19
5846 informix 2796M 2347M sleep 59 -10 7:44:29 0.5% oninit/18
5847 informix 2796M 2346M sleep 59 -10 7:25:24 0.5% oninit/17
5845 informix 2796M 2346M sleep 50 -10 7:58:07 0.4% oninit/18
5850 informix 2796M 2345M cpu37 40 -10 6:20:17 0.6% oninit/21
5848 informix 2796M 2343M sleep 59 -10 7:08:30 0.5% oninit/17
5849 informix 2796M 2343M sleep 52 -10 6:49:08 0.4% oninit/18
5853 informix 2796M 2342M sleep 59 -10 4:14:47 0.0% oninit/19
5857 informix 2796M 2337M sleep 59 -10 3:19:36 0.0% oninit/17
5854 informix 2796M 2334M sleep 59 -10 3:52:52 0.0% oninit/17
5855 informix 2796M 2334M sleep 59 -10 3:34:57 0.0% oninit/18
5856 informix 2796M 2332M sleep 59 -10 3:26:08 0.0% oninit/19
=====

An "onstat -g rsm sendq | grep queue" 60 seconds apart produced the following:

Txns in queue: 13438400
Log Events in queue: 39
Size of Data in queue: 7601814074 Bytes
Total data queued: 7010242960 Bytes
Total Txns queued: 18842496
===
Txns in queue: 13435039
Log Events in queue: 39
Size of Data in queue: 7599625995 Bytes
Total data queued: 7010242960 Bytes
Total Txns queued: 18842496
===

Currently, it looks like 2,188,079 Bytes per minute are transferring to the backup. With 7,601,814,074 Bytes in the queue, looks like it will take another 3474 minutes, or about 57 more hours.

Once again, I see that the data is getting replicated, it's just happening very slowly.

Any suggestions on how to tune my Solaris box would be appreciated.

Thanks,
Jeff

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