PlatinumRAID Owner’s Manual
4. Physical Drive Functions (D)
4.1 Create a Pass-Through Disk
A Pass-through disk can be defined to dedicate a single disk as not controlled by the RAID
subsystem firmware and thus cannot be a part of a RAID set. Instead, the disk is available to
the operating system as an individual disk. To create a Pass-Through disk, select the Create
Pass-Through Disk option. A table will appear with available disks that are not already
mapped to a RAIDset, hot spare, or existing passthroughs. Check the radio button next to the
desired disk, and enter the values for the attributes listed below. When all fields are finalized,
check the box labelled “Confirm the operation” and Click the “Submit” Button.
4.1.1 Volume Cache Mode
PlatinumRAID supports Write-Through and Write-Back Caching algorithms. In the Write-
Back caching method, modifications to data in the cache aren’t copied to the cache source
until absolutely necessary, whereas a Write-Through cache performs all write operations in
parallel -- data is written to the storage and the cache memory simultaneously. Write-back
caching yields somewhat better performance than write-through caching because it reduces
the number of write operations to disk, but is also more prone to data loss due to service
interruptions.
6-RAID Controls-Web Interface
