Filter
Top Products
24 About Your System
Cache Functions and Features
Cache Mirroring
The cache mirroring function copies accepted host-write data from the
primary controller to the partner controller. This action ensures that host-
write data is safely mirrored to the partner controller before successful
completion status is returned to the host. If a controller fails, the surviving
controller safely retains all mirrored data. Cache mirroring is enabled by
default.
Write-Back Cache
Write-back cache is a caching strategy whereby write operations result in a
completion signal being sent to the host operating system as soon as the
cache receives the data to be written. The target physical disk will receive the
data at a more appropriate time in order to increase controller performance.
In dual-active controller configurations with write-back caching enabled, the
write data is always copied to the cache of the second controller before
completion status is issued to the host initiator. Write Back is enabled by
default.
Write-Through Cache
Write-through cache is a caching strategy whereby data is written to the
physical disk before completion status is returned to the host operating
system. Write-through cache is considered more secure than write-back
cache, since a power failure is less likely to cause loss of data. The RAID
controller automatically switches to write-through if cache mirroring is
disabled or if the battery is missing or has a fault condition.
NOTE: Write cache settings are not user-configurable.
Power Supply and Cooling Fan Features
Your RAID enclosure supports two integrated, hot-pluggable power
supply/cooling fan modules. Both modules must be installed to ensure proper
cooling. Each module contains two separate cooling fans. The enclosure
requires at least three of the cooling fans to operate to avoid overheating.