Product specifications

Infortrend
2-4
2.2.4 Write-back/Write-through Cache Enable/Disable
As one of the submenus in "Caching
Parameters," this option controls the
cached write function. Press ENT to
enable or disable “Write-back Cache.”
Press ENT for two seconds to confirm.
The current status will be displayed on the
LCD.
The Write-through mode is safer if your
subsystem is not managed by a controller
pair and there is no UPS or battery backup.
Write-back caching can dramatically improve write performance by
caching the unfinished writes in memory and letting them be
committed to drives latter in a more efficient manner. In the event
of power failure, a battery module can hold cached data for days. In
the event of controller failure in a dual-active configuration, data
cached in the failed controller has an exact replica on its counterpart
controller and therefore remains intact.
2.2.5 Periodic Cache Flush
If for a reason Write-Back caching is preferred for better
performance and yet data integrity is of the concern, e.g., lack of the
battery protection, the system can be configured to flush the cached
writes at every preset interval.
Note that the “Continuous Sync” option holds data in cache for as
long as necessary to complete a write operation and immediately
commits it to hard drives if it does not come in a series of sequential
writes.
Select from Main Menu “View and Edit
Config Parms,” “Caching Parameters,”
and press ENT. Use the arrow keys to
scroll through the options and select
“Periodic CachFlush Time”, and then
press ENT to proceed. The “Set Cache
Flush Time – Disable” appears. The
default is “Disable.” Use your arrow keys
to select an option from “ConSync,”
“1/2min,” to “10min.” “ConSync” stands
for “continuously synchronized.” Press
ENT to select and press ESC to leave and
the setting will take effect immediately.
Write-Back Cache
Enabled ..
Disable Write
-Back Cache ?
Period CachFlush
Time - Disable
Set Cache Flush
Time - Disable