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20 Hardware Installation and User’s Guide
Hardware Specifications and Features
3.3.2 Support for Non-Hard-Disk-Drive SCSI Devices (Non-Direct-
Access Devices)
The RAID controller will pass through to the host operating system direct access to non-
direct-access SCSI devices which are connected to a SCSI bus (channel) of the RAID
controller. The RAID controller passes through all control of these devices to the host
operating system.
Types of supported non-Direct-Access SCSI devices (this does not cover specific vendors
and models):
• SAF-TE Processors
• Tape Backups
• CD-ROMs
3.4 RAID Array Drive Roaming
Array Roaming allows the user the ability to move a complete RAID array from one
computer system to another computer system and preserve the RAID configuration
information and user data on that RAID array. ††Compatible RAID controllers must
control the RAID subsystems of the two computer systems (see list of compatible
controllers in this section). The transferred RAID array may be brought online while the
target server continues to run if the hard disk drives and disk enclosure support hot plug
capabilities; however, not all operating systems support this feature. The hard disk drives
are not required to have the same SCSI ID in the target system that they did in the original
system that they are removed from. The RAID array drive that is being roamed must not
be of type Private. This includes all non-private host, array, and logical drives.
Wide Ultra 2
(4)
80 16
(4)
12 16
Ultra160 (Ultra 3) 160 16 (4) 12 16
Ultra320 320 16 (4) 12 16
Notes:
1. May be exceeded in Point-to-Point and engineered specific applications.
2. Use of the word "Narrow", preceding SCSI, Ultra SCSI, or Ultra2 SCSI (for example, Narrow
SCSI) is optional.
3. LVD was not defined in the original SCSI standards for this speed. If all devices on the bus
support LVD, then 12-meters operation is possible at this speed. However, if any device on the
bus is singled-ended only, then the entire bus switches to single-ended mode and the distances
in the single-ended column apply.
4. Single-ended is not defined for speeds beyond Ultra.
After Ultra2 all new speeds are wide only.
Table 3-4. Supported SCSI Device Standards
SCSI Drive
Standard
Speed
(MB/Sec)
Bus Width
(Bits)
Maximum Cable
Length (meters)
(1)
Adapter Maximum
Devices per SCSI
Channel
Single-
Ended
LVD