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Chapter 1 – Introduction
Supporting SCSI/Fibre Interface
ACS-9910 supports SCSI and Fibre interface.
A supplementary connecting device
(daughter-board) is required for Fibre connection. See Appendix A, Installing/Removing
Daughter-board for details.
Flexible Array Management
The unique ACS-9910 array management firmware utilizes multitasking real-time kernel
technology to manage the controller. Additional features are real-time I/O load analysis,
on-line diagnostics, event logging and broadcasting, and device inventory management.
These features can be accessed locally or via modem to allow centralized monitoring and
control of the ACS-9910.
Hard Drive Hot Swapping
Hot Swapping allows for the removal and installation of disk drives without interruption of data
access while the ACS-9910 system is in use. This is usually performed when there is no Hot
Spare drive configured. There is no need to power down the system.
Automatic Global Hot Spare
Hot Spare allows for the automatic replacement of a failed drive without requiring intervention
from the administrator. When a disk fails the ACS-9910 will automatically replace the faulty
drive with the configured hot spare disk.
The Global Spare Drive does not serve only a specified logical drive. When a member drive
from any of the logical drives fails, the Global Spare Drive will join that logical drive and
automatically start to rebuild.
Automatic Drive Rebuild
If a member drive in a logical drive fails, the controller will first check whether there is a Local
Spare Drive assigned to this logical drive. If yes, it will automatically start to rebuild.
If there is no Local Spare Drive available, the controller will search for a Global Spare Drive.
If there is a Global Spare Drive, it will automatically rebuild the logical drive.
If neither Local Spare Drive nor Global Spare Drive is available, the controller will not try to
rebuild unless the user applies a manual forced-rebuild.
Instant Remote Notification
ACS-9910 supports but does not require additional software for system monitoring and
analysis. The ACS-9910 array management firmware continuously monitors the system
activity and immediately launches the fax event notification feature if any failure occurs. Up to
two pager numbers and two fax numbers can be notified instantaneously and repeatedly for
extra assurance.
UPS Support
ACS-9910 supports the use of an uninterruptible power supply. In the event of a power
breakdown, a UPS will keep the RAID controller online long enough for its internal cache
memory to be saved to a hard drive.
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