5.2.4 Considerations for using a hot-standby configuration in a virtualization environment (when using Hitachi server virtualization (Virtage))
In BladeSymphony with Hitachi server virtualization installed, you can divide the processor into logical partitions (LPARs) and perform hot standby processing for each LPAR (LPAR mode). For details about hot standby processing in units of LPARs when host reset is performed, see 3.3.6 Physical partition reset function in a virtualization environment. For details about the setup procedure for running LPARs using Hitachi server virtualization, see the BladeSymphony documentation.
This subsection discusses considerations on using LPARs as the hot standby units.
- Organization of this subsection
(1) Evaluating the LPARs and processor to be used in a hot-standby configuration
Between the LPAR and Basic modes, there is no difference in HA Monitor operations other than whether the reset target is an LPAR or a processor. You can perform hot standby processing either between LPARS or between an LPAR and a processor.
There is no problem when the hosts constituting a hot-standby configuration are in the same chassis. However, in terms of reliability, we recommend that you use separate processors for the hosts that constitute a hot-standby configuration.
(2) Handling hardware limitations
In BladeSymphony, there is a limit to the number of peripheral devices that can be added to a single chassis. If you increase the number of hosts per chassis in the LPAR mode, the normal hardware configuration might no longer be achieved.
For details about the hardware limitations, see the hardware documentation.