IBM Systems Magazine, Power Systems - IBM i digital edition, March 2009 - 31

detached, however, changes can occur on it as well as on the production copy. Before i 5.4, reattaching required a full synchronization, which means everything on the production copy is sent to the mirror copy. Via PTF in i 5.4 and in the base release of i 6.1, target-side tracking became available. Now changes are tracked on both the production and mirror copies, so when the mirror copy is reattached, only the pages that were changed on either side are re-sent from production to mirror. With this enhancement, geographic mirroring full synchronizations are only required when IBM i can’t start sourceand target-side tracking in concert (e.g., if the target side has a failure due to site disaster that lasts longer than the specified timeout value), or in other cases where changes can’t be tracked. have a smaller effect on IBM i partition performance. There’s still some effect on response time, which depends on the distance between the local and remote storage systems. Met ro M ir ror is a sy nch ronous solution where t he wr ite must be completed on both the production and mirror copies before the operation is considered complete (Figure 2, page 30). Metro Mirror is generally considered a campus-level solution, where the systems are located in fairly close proximity, such as within the same city. However, the distance supported will vary based on the write intensity of Introducing the First SPARC-Based Blade for the BladeCenter Ecosystem. ® NEW! THEMIS® T2BC™ ULTRASPARC T2-BASED SERVERS - Eight cores in the Sun® UltraSPARC® T2® 1.2 GHz processor. - Up to 64GB ECC fully buffered DDR2 memory. - Internal SATA or SAS 2.5” hard disk drive. - Installs in IBM® BladeCenter® chassis and interoperates with other IBM blade servers. - Integrated dual Gigabit & 10 Gigabit Ethernet controllers. - Runs Solaris™ 10 applications unmodiﬁed, and Solaris 8/9 applications with Sun Solaris 8 or Solaris 9 Containers. Metro Mirror Another option for deploying XSM is Metro Mirror. PowerHA for i supports Metro Mirror solutions with the System Storage DS6000 and DS8000 systems. T he Copy Ser v ices f u nc t iona l it y available with those devices is used to replicate data within the IASP from production to backup. This is done at a disk-sector level instead of the page-level replication of geographic mirroring. With Copy Services functionality, some of the replication’s performance impact is moved from the IBM i partition to the storage device, so this solution tends to Now You Can Run Your Solaris Applications Natively, on UltraSPARC Processors, within an IBM BladeCenter. Themis’ T2BC blades are the industry’s ﬁrst blade servers to run Solaris 10 applications natively, on the Sun UltraSPARC T2 Chip Multi-Threading processor, within IBM BladeCenters. Each of the T2 processor’s eight cores has dual execution units, each execution unit supports four threads for a total of 64 “hot” threads per socket and an efﬁciency approaching sixteen parallel instructions per clock. The T2BC functions as an independent Sun T2 server running the Solaris operating system. It installs quickly and easily in the family of IBM BladeCenter chassis with IBM blades, enabling the T2BC to work with blade servers that utilize other processor architectures and operating systems. Themis’ high performance servers are integrated into advanced computing systems and datacenters worldwide. Call today or visit us on online for more details on our exceptional server solutions. Figure 4 Flash Copy www.themis.com (510) 252-0870 Transformational. ©2009.Themis Computer, Themis, Themis logo, and T2BC are trademarks or registered trademarks of Themis Computer. All other trademarks contained within are property of their respective owners. MARCH 2009 ibmsystemsmag.com/ibmi 31

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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