Cache; Figure 62: Gui "Cache - Accusys ExaSAN A08S3-PS User Manual

This mode is designed to provide smooth sequential access, such as during video editing and
capture, to the RAID system. To achieve best system performance, NCQ mode is automatically
turned off.

4.1.2.7.2 Cache

Cache memory in the controller enhances read and write performance, improving overall
storage throughput streaming data can be queued into the cache to dramatically accelerate
read performance. Under different applications, cache has different influence on the RAID
system.
Controller Cache – Check this box to enable the controller cache. This speeds up the data
transfer to and from the disks.
Caution
If controller cache is enabled, it is suggested that you use a UPS
(uninterruptible power supply) system to prevent a data loss scenario.
Synchronize Cache – Check this box to enable cache synchronization. When Synchronize
Cache mode is disabled, the RAID controller works correctly but does not actually perform any
cache flushing. For video capture, disable synchronization because the video capture needs to
be able to constantly write data to the RAID storage without long SYNCHRONIZE_CACHE
latency. Synchronize cache commands the controller to regularly synchronize the information on
the drive and is usually used in conjunction with the UPS.
Note
This option is available if Mode > Equalization Mode is unchecked.
User Guide

Figure 62: GUI "Cache"

4. How to Use
Page 4-24