Intel Computer Hardware 273561-003 User Manual download pdf (Page 20)

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

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 26 27

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