Changing the logical-memory block size
You might enhance the managed system performance by manually or automatically changing the logical-memory block size.
The system kernel uses the memory block size to read and write files. By default, the logical-memory block size is set to Automatic. This setting allows the system to set the logical-memory block size that is based on the physical memory available. You can also manually change the logical-memory block size.
To select a reasonable logical block size for your system, consider both the performance that is wanted and the physical memory size. Use the following guidelines when selecting logical block sizes:
- On systems with a small amount of memory installed (2 GB or less), a large logical-memory block size results in the firmware taking an excessive amount of memory. Firmware must use at least one logical-memory block. Generally, select the logical-memory block size to be no greater than one eighth the size of the system's physical memory.
- On systems with a large amount of installed memory, small logical-memory block sizes result in many logical-memory blocks. Because each logical-memory block must be managed during boot, many logical-memory blocks can cause boot performance problems. Generally, limit the number of logical-memory blocks to 8 K or less.
Note: The logical-memory block size can be changed at run time,
but the change does not take effect until the system is restarted.
To change logical-memory block size,
you must have one of the following authority levels:
- Administrator
- Authorized service provider
To configure logical-memory block size, follow these steps:
- On the ASMI Welcome pane, specify your user ID and password, and click Log In.
- In the navigation area, expand Performance Setup.
- Select Logical Memory Block Size.
- In the right pane, select the logical-memory block size and click Save settings.