Acer AcerAltos 3102RS, User Manual

Page: 41 / 303

Chapter 3 Functional Descriptions
23
Cache Parameters
Optimization for Sequential or Random I/O
When using RAID with applications such as video or image oriented
applications, the application reads/writes from the drive using large-
block, sequential files instead of small-block, random access files.
The AA-3102RS RAID controller provides the options to optimize for
large-sequential I/O or optimize for small-random I/O access.
"Optimization for Sequential I/O" provides larger stripe size (block size,
also known as Chunk size) than "Optimization for Random I/O". A lot
of the controller’s internal parameters will also be changed to optimize
for sequential or random I/O. The change will take effect after the
controller reboots.
If the existing logical drives were built with "Optimization for Random
I/O", these logical drives will not read/write when using "Optimization
for Sequential I/O" (shows "INVALID") and vice versa because the
stripe size is different. Change it back to the original setting and reset
the controller to make available the logical drive data again.
Changing the setting to "Optimization for Sequential
I/O" or "Optimization for Random I/O" should be
performed only when no logical drive exist.
Otherwise, you will not be able to access the data in
the logical drive later on.