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INTRODUCTION
11
chips, which can simultaneously communicate with the I/O proces-
sor and read or write data on multiple drives.
Unsurpassed Data Availability
As storage capacity requirements continue to rapidly increase, us-
ers require greater levels of disk drive fault tolerance, which can be
implemented without doubling the investment in disk drives. RAID
1 (mirroring) provides high fault tolerance. However, half of the
drive capacity of the array is lost to mirroring, making it too costly
for most users to implement on large volume sets due to dobuling
the number of drives required. Users want the protection of RAID 1
or better with an implementation cost comparable to RAID 5. RAID
6 can offer fault tolerance greater than RAID 1 or RAID 5 but only
consumes the capacity of 2 disk drives for distributed parity data.
The 8/12/16/24-port RAID controllers provide RAID 6 functionality
to meet these demanding requirements.
The SATA RAID controllers also provide RAID levels 0, 1, 1E, 3, 5
or JBOD congurations. Its high data availability and protection is
derived from the following capabilities: Online RAID Capacity Ex-
pansion, Array Roaming, Online RAID Level / Stripe Size Migration,
Dynamic Volume Set Expansion, Global Online Spare, Automatic
Drive Failure Detection, Automatic Failed Drive Rebuilding, Disk
Hot-Swap, Online Background Rebuilding and Instant Availabil-
ity/Background Initialization. During the controller rmware ash
upgrade process, it is possible that an error results in corruption of
the controller rmware. This could result in the device becoming
non-functional. However, with our Redundant Flash image feature,
the controller will revert back to the last known version of rmware
and continue operating. This reduces the risk of system failure due
to rmware crashes.
Easy RAID Management
The SATA RAID controller utilizes built-in rmware with an embed-
ded terminal emulation that can access via hot key at BIOS boot-
up screen. This pre-boot manager utility can be used to simplify
the setup and management of the RAID controller. The controller
rmware also contains a ArcHttp browser-based program that can
be accessed through the ArcHttp proxy server function in Windows,