RSCT Commands – Cheat Sheet

Reset RSCT Configuration (completely remove all cluster configuration) # /usr/sbin/rsct/install/bin/recfgct Change the tie-breaker # chrsrc -c IBM.PeerNode OpQuorumTieBreaker='Operator' Find out which tie-breaker is in use # lsrsrc -c IBM.PeerNode OpQuorumTieBreaker...

Clear Reservations from Tie-Breaker

Read reservations: /usr/bin/sg_persist --in --no-inquiry --read-reservation --device=/dev/sdc /usr/bin/sg_persist --in --no-inquiry --read-key --device=/dev/sdc Prepare for cancel: /usr/bin/sg_persist --out --no-inquiry --register --param-sark=0x1 --device=/dev/sdc...

Tie-Breaker Disk for HADR or pureScale

I had documented same for zLinux here http://www.zinox.com/archives/182 When you use a tie-breaker disk in pureScale or in HADR, it must be Write Exclusive Registrants Only. It is a good idea to test if the tie-breaker disk is working as expected or not. The...

GPFS, RSCT and TSA Version Info.

RSCT Version [root@node02 iscsi]# /usr/sbin/rsct/install/bin/ctversion -b rliss005a 3.1.5.5 14182.07:51:59 TSA Version [root@node02 iscsi]# /usr/sbin/rsct/bin/samversion rsa322s008a 3.2.2.8 Jul 18 2014 10:02:26 # lsrsrc -Ab -c IBM.CHARMControl # lssamctrl GPFS Version...

DB2 pureScale – shared disks using SCSI-3 PR

How to find if the shared disks being used for pureScale are SCSI-3 PR capable or not after creation of pureScale install. # /usr/lpp/mmfs/bin/mmlsconfig minReleaseLevel,usePersistentReserve minReleaseLevel 3.5.0.11 usePersistentReserve no  ...

Clean-up pureScale

If you want to clean the system having pureScale or want to drop pureScale instancefor installing a fresh instance of pureScale, follow on: Obviously, you want to follow the steps given in DB2 Knowledge Center first. If you have a working pureScale install where you...

DB2 pureScale – Online Rolling update

These note are valid only on AIX. Please note the following: There are two types of updates – System update (applying eFixes or Service Packs on AIX). If you are applying the system packs or efixes on a pureScale host, please call the DBAs and work in...

DB2 Table Spaces – When to use File System Caching

In DB2, the file system caching is turned on by default for SYSTEM or USER TEMPORARY table spaces but turned off other DMS. If you have LOBS (CLOB, BLOB or XML) in a table, try to follow these guidelines: Put LOBS in a separate table space. Use ADMIN_MOVE_TABLE to do...

X Display Issues as sudo

When you do sudo to another user, you may have to do extra things to get X display working or any GUI working. Many organizations do not allow root login so X window cookie does not get generated and hence GUI does not work. I prayed to Google God for solutions and...

DB2 10.5 pureScale TSA Recovery

A third party single sign-on application was installed on two nodes of db2 cluster having 2 CF and 4 members. The pureScale cluster started showing signs of trouble and naively, we did not think the impact of the software installed. This single sign-on software (as we...

Client Connection Attributes and WLM

Client Connection Attributes When you establish connection to DB2 using Java programs, you need 5 minimum attributes DB2 server name or IP address Port Number (socket connection) Database name User ID Password This could be defined as a URL in the Java program such...

Change mount point in pureScale Cluster

When we install DB2 instance as a pureScale, we can specify the name of the mount point by using option instance_shared_mount. If we do not use this option, the mount point name is generated by the db2icrt command as /dv2sd_<timestamp> and this may not be the...

Monitor Crash Recovery Script

If DB2 was processing a very long running transaction (say updating millions of rows) and for some reason like power failure, server goes down. When you start the server and activate the database, it may take a long time as it needs to do the crash recovery. This is...

How to find out LOG HOG

If you run into LOG FULL condition in DB2 with SQL error code: SQL0964C, you need to increase the size of either of the following: LOGPRIMARY, LOGSECOND or LOGFILSZ. So, you change that even after that you again run into LOG FULL condition. What is happening? You can...

Change IP address in pureScale cluster

These instructions are for changing the IP address in a pureScale cluster. Please remember that the IP address can be changed easily for DB2 but it is RSCT and GPFS that requires special handling to change the IP address. You change the IP address one by one in a...

Google God

I started using Google from very early on (Since Feb 1998) and since then it has remained my home page. Needless to say that I now consider Google as God since it knows everything. In my day-to-day conversation, I ask people “Did you ask Google God?” So...

Client Affinity and Automatic Client Reroute for Java

Let us understand client affinity and automatic client reroute. For example: We have 3 members in a DB2 pureScale cluster and I have one application that connects to one member from any application server. The same application connects to the second member from...

Test Automatic Client Reroute

Wouldn’t it be nice to do some Java testing without writing a line of code? For the following to work, it is necessary that db2jcc.jar and db2jcc_license_cu.jar are on the CLASSPATH. If you login as db2 instance user, these jar files should be in the CLASSPATH...

DB2 pureScale GPFS Error

Say for example, you are creating a file system using db2clutser command in DB2 pureScale and it fails with this error: # db2cluster -cfs -create -filesystem db2data1 -disk /dev/dm-2 -mount /db2data/data1 There was an internal db2cluster error. Refer to the diagnostic...