User`s guide

• CLONE utility for making block-for-block copies of a single device, mirrorset,
or striped mirrorset
2.2.3.5 Error Logging and Fault Management
Error logging and fault management collects system errors in a central location
and sends the error information to the host.
2.2.4 Device Services
SCSI–2 device service firmware includes device port drivers and physical device
addressing and access algorithms. Device services consist of normal functions
such as read and write, as well as error recovery code. It also monitors and
controls storage shelf and storage device LEDs, power, and cabinet blowers.
Specific functions include the following:
• SCSI–2 device control (8 bit, single-ended normal or FAST synchronous
mode).
• Tagged command queuing for SCSI–2 devices.
• Disk and tape drive connection on the same controller port (includes optical
devices and tape loaders) for HSJ and HSD30 array controllers. (You may see
a decrease in performance for the disks on a port during large tape operations
for that port’s tape devices.)
Note
Tape drives, loaders, optical drives and CD–ROMs are not currently
supported for HSZ array controllers.
• Read and write physical device addressing and access.
• Device warm swap support
• Storage shelf and storage device observation and control
• Command disk support to allow ‘‘jukeboxes’’ and other generic SCSI–2 devices
to be attached to MSCP-based hosts. HSOF Version 2.5 supports multiple
LUNs on HSJ and HSD30 array controllers to allow automatic tape loading
on supported tape loader models. Refer to HSOF Version 2.5 HSJ or HSD30
release notes for information regarding supported models.
2.2.5 Value-Added Functions
The controller’s firmware contains value-added functions to enhance basic
availability, performance, subsystem management and maintenance, and
connectivity. Specific functions include the following:
• Availability functions:
Failover capability for all host interfaces is available in dual-redundant array
controller configurations.
• Performance functions:
Performance of the controller is enhanced by read or write-back caching.
• Subsystem management and maintenance functions:
Controller maintainability is enhanced by controller/cache warm swap
support.
Controller Technical Description 2–15