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 block memory size 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 desired 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 consuming an excessive amount
of memory. Firmware must consume at least 1 logical memory block. As
a general rule, select the logical memory block size to be no greater than
1/8th the size of the system's physical memory.
- On systems with a large amount of memory installed, small logical memory
block sizes result in a large number of logical memory blocks. Because each
logical memory block must be managed during boot, a large number of logical
memory blocks can cause boot performance problems. As a general rule, 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 perform
this operation, your authority level must be one of the following:
- Administrator
- Authorized service provider
To configure logical memory block size, perform the following
task: