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Appendix B. Using the DS6000 with iSeries 361
storage) being copied, only the application resides in an IASP and in the event of a disaster,
the target copy is attached to the DR server.
Additional considerations must be taken into account such as maintaining user profiles on
both systems, but this is no different from using other availability functions such as switched
disk between two local iSeries Servers on a High Speed Link (HSL) and Cross Site Mirroring
(XSM) to a remote iSeries. However, with Remote Mirror, the distance can be much greater
using the synchronous Metro Mirror than the 250 meter limit of HSL, and with the
asynchronous Global Mirror, there is little performance impact on the production server.
Whereas with FlashCopy where you would likely only have data in an IASP, for DR with
Remote Mirror, you also need the application on the DR system. This can either reside in
*SYSBAS or in an IASP. If it is in an IASP, then the entire application would be copied. If it is
in *SYSBAS, you will need to ensure good change management facilities to ensure both
systems have the same level of the application. Also, you must ensure that system objects in
*SYSBAS, such as User Profiles, are synchronized.
Again, the DR server could be a dedicated system, or perhaps more likely, a shared system
with development, testing, or other function in other partitions or IASPs.
iSeries toolkit for Copy Services
Although it is possible to use FlashCopy and Remote Mirror functions with iSeries, for
practical reasons, many customers will choose not to use basic FlashCopy and Remote
Mirror functions due to the LSU restrictions discussed previously. Instead, IBM recommends
that Copy Services should only be used with the iSeries toolkit for Copy Services, which uses
OS/400 IASPs and provides control of the clustering environment necessary to use IASPs
with Copy Services. More information about the Copy Services toolkit can be found at:
http://www-1.ibm.com/servers/eserver/iseries/service/itc/pdf/Copy-Services-ESS.pdf
Contact your IBM representative if you wish to implement the iSeries toolkit for Copy
Services, or contact the iSeries Technology Center directly at:
mailto:rchclst@us.ibm.com
AIX on IBM iSeries
With the announcement of the IBM iSeries i5, it is now possible to run AIX in a partition on the
i5. This can be either AIX 5L V5.2 or V5.3. All supported functions of these operating system
levels are supported on i5, including HACMP for high availability and external boot from Fibre
Channel devices.
The DS6000 requires the following i5 I/O adapters to attach directly to an i5 AIX partition:
0611 Direct Attach 2 Gigabit Fibre Channel PCI
0625 Direct Attach 2 Gigabit Fibre Channel PCI-X
It is also possible for the AIX partition to have its storage virtualized, whereby a partition
running OS/400 hosts the AIX partition's storage requirements. In this case, if using DS6000,
they would be attached to the OS/400 partition using either of the following I/O adapters:
2766 2 Gigabit Fibre Channel Disk Controller PCI
2787 2 Gigabit Fibre Channel Disk Controller PCI-X