Dot Hill Systems SANnet II 200, Installation, Operation And Service Manual

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Chapter 1 Product and Architecture Overview 1-3
Table 1-1 shows the configuration options for SANnet II 200 SCSI arrays.
For information about maximum disk, logical drive, and array capacity, refer to the
SANnet II Family RAID Firmware User’s Guide .
1.3 SCSI Architecture
Each RAID array has five channels with the following defaults:
■
Channels 1 and 3 are host channels connected to servers. Any SANnet II 200 SCSI
array host channel can be reassigned as a drive channel to connect to an expansion
unit.
■
Channels 0 and 2 are drive channels that connect the internal 12-disk drives in the
RAID chassis, and can also be used to add expansion chassis to the configuration.
Channel 2 can also be reassigned as a host channel. However, in a dual-bus
configuration, channel 2 must be a drive channel.
Table 1-1 SANnet II 200 SCSI Array Configuration Options
Internal RAID controllers
1 or 2
SCSI disks
Up to 12 per array or per expansion unit, with a
minimum of 4 plus 1 spare
SCSI expansion units
1
1. A disk array with no controller.
Up to 2
SCSI JBOD arrays
2
2. A disk array with no controller that is connected directly to a host computer, with no RAID array.
1
Connection options
• Serial port
• Ethernet
Supported RAID levels
0, 1, 3, 5, 1+0, 3+0, and 5+0
Redundant field-replaceable
units (FRUs)
• Power supply and fan modules
• Controller modules
• I/O modules
• Disk drive modules
• EMUs (event monitoring unit)
Configuration management
and enclosure event
reporting options
3
3. The host-based SANscape software provides a graphical user interface (GUI) and additional event-reporting capabili-
ties.
• In-band SCSI ports
• Out-of-band 10/100BASE-T Ethernet port
• RS-232 connectivity
• Enclosure monitoring by SCSI Accessed Fault-
Tolerant Enclosure (SAF-TE)