Compaq StorageWorks Modular Array Configuration Guide (EK-MAC0N-CA. A01, April 2000)

2 Modular Array Configuration Guide
Compaq Confidential – Need to Know Required
Writer: Patrick Waychoff Project: Modular Array Configuration Guide Comments:
Part Number: EK-MACON-CA. A01 File Name: EK-MACON-CA-A01.doc Last Saved On: 4/3/00 3:52 PM
Table 1
Single-Bus and Dual-Bus Modes
Mode Advantages Disadvantages
Single Bus
Greater disk capacity per
controller channel.
Shelf failure only effects one
channel.
More drives per channel can
degrade performance.
Doubles rack space consumed
versus dual bus shelves.
Dual Bus
Fewer drives per channel may
increase performance.
Half the rack space consumed
versus single bus shelves
allows greater disk and
controller capacity per cabinet.
Less disk capacity per controller
channel.
Shelf failure effects two channels
possibly causing RAIDset failure.
The maximum number of drives behind an HSG80 (single or cooperating pair)
using six single-bus Model 4214 disk enclosures is 72.
The maximum number of drives behind an HSG80 (single or cooperating pair)
using three dual-bus Model 4254 disk enclosures is 42.