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The DB2 pureScale system diagram that is shown in Figure 1 describes the migration of disks that include logs and data in to a new physical storage hardware. 

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The basic steps are based on the IBM Technote “Changing physical disk storage of GPFS file system" (found at http://www.ibm.com/support/docview.wss?uid=swg21633330). This web doc provides more details that help to answer the following questions: 

Can you add or remove multiple disk physical volumes by using one command?  

What is the potential impact of adding disks during an online transaction?  

Does GPFS file system auto-rebalancing happen automatically?  

How do you monitor the rebalancing status of a GPFS file system?  

What are the expected outputs of each step and the corresponding estimated elapsed time?  

Note: Elapsed times vary depending on the system resources and configuration. All the elapsed time information that is provided in this web doc is for reference only. 

How do you change GPFS and the TSA tiebreaker disk? Is it possible to implement this task while the  system is online? 

In this scenario example, we use an IBM DS8000® storage system as the source storage system and EMC DMX as the destination storage system. 

The following sections describe the steps to take after you attach new EMC storage to DB2 pureScale cluster hosts. 

