IBM Systems Magazine, Power Systems - IBM i digital edition, March 2009 - 24

with IBM i’s high-availability switchable Table 1 IBM i HA/DR Offering Summary V6R1 resources (HASR or Option 41), lets you deploy a hardware-based H A and DR solution. The underlying data resiliency for PowerHA on i is based on the IASP, a collection of disks in a storage pool that’s mirrored between nodes in a cluster. Think of it as disk-level mirroring on a single system, only imagine the mirrored copy is attached to another system, and that system can take ownership of the mirrored copy during a planned or unplanned outage. The PowerHA package lets you manage your HA/DR operations from a UI deployed via IBM Systems Director Navigator for IBM i and, coming If you’re interested in what these clients have to say, visit the soon, Systems Director 6.1. You may deploy the solution with IBM customer success story Web site (www.ibm.com/systems/ internal disks (or any supported disk subsystem) and geographic power/success/index.html) or Google “PowerHA.” It’s exciting mirroring (IBM i mirroring over IP) or via the DS6000* or to hear reports from the Lab Services team as they travel the DS8000* systems using either Metro Mirror or Global Mirror. world working on PowerHA for i proof of concept and benchmark Power HA also supports IBM System Storage FlashCopy, which testing. In one test, a PowerHA, DS8000 and Global Mirror gives IBM i customers new options to quickly clone data and topology was tested for DR while running a full batch job. applications to enable new HA save/restore options. Testers forced a network failure and the switchover time was Geographic mirroring is referred to as host-based replication. only seven minutes. Metro Mirror and Global Mirror are referred to as storageNot only is switchover time saved, but HA-management time server-based replication. Storage-server-based solutions are more is, too. Dick Cosby, systems administrator from EDPS, spoke to a robust than host-based methods because, among other things, large-user-group colleague who said managing his HA solution the replication service can continue to operate even if one of the took only 18 minutes a day. Cosby commented that his requires nodes in the cluster is out of production. Figure 1 (below) and zero. Read more about Cosby’s HA solution online (www.ibm. Table 1 (above) illustrate IBM i HA/DR solution positioning. com/software/success/cssdb.nsf/cs/csdb-6wd83p? and www. ibmsystemsmag.com/ibmi/august07/endpgm/16965p1.aspx). In my experience, people tend to think of the PowerHA Finding Success for i solution as only for ver y large clients. But when PowerHA for i is new as of IBM i 6.1, but many clients around you consider staff ing, the solution is custom f it for the world have deployed the predecessor product in i 5.4 smaller firms with only a few IT professionals. Once the with the HASR/Option 41 feature. They use either System i* PowerHA for i solution environment is implemented, it Navigator or the IBM System Storage Copy Services Tool Kit manages itself. for IBM i as the management interface. Figure 1 IBM i Multi System Data Resiliency Figure 2 IBM Systems Storage & PowerHA Cluster 24 MARCH 2009 ibmsystemsmag.com/ibmi

http://www.ibm.com/systems/power/success/index.html http://www.ibm.com/systems/power/success/index.html http://www.ibm.com/software/success/cssdb.nsf/cs/csdb-6wd83p? http://www.ibm.com/software/success/cssdb.nsf/cs/csdb-6wd83p? http://www.ibmsystemsmag.com/ibmi/august07/endpgm/16965p1.aspx http://www.ibmsystemsmag.com/ibmi/august07/endpgm/16965p1.aspx http://www.ibmsystemsmag.com/ibmi

IBM Systems Magazine, Power Systems - IBM i digital edition, March 2009

Table of Contents for the Digital Edition of IBM Systems Magazine, Power Systems - IBM i digital edition, March 2009