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20 Chapter 2
Subsystem Architecture and Components
Table 2.2 ACP Specifications
Description Specification for 9960 Specification for 9910
Number of ACP pairs 1, 2, 3 or 4 1
Backend paths per ACP pair 8
Backend paths per subsystem 8, 16, 24 or 32 8
Array group (or parity group) type per ACP pair RAID-1 and/or RAID-5
Hard disk drive type per ACP pair
[1]
18 GB, 47 GB, 73 GB, 146 GB, 180 GB
[2]
Logical device emulation type within ACP pair 3380-x, 3390-x, and OPEN-x
[3]
Backend array interface type Fibre-channel arbitrated loop (FC-AL)
Backend interface transfer rate (burst rate) 100 MB/sec (1 Gbps)
Maximum concurrent backend operations per ACP pair 8
Maximum concurrent backend operations per subsystem 32 8
HiStar Network architecture internal bandwidth 1.6 or 3.2 GB/sec 1.6 GB/sec
Notes:
1. All hard disk drives (HDDs) in an array group (also called parity group) must be the same type. Please contact your Hitachi
Data Systems representative for the latest information on available HDD types.
2. The 180-GB HDDs should not be intermixed with other HDD types in the same array domain (behind the same ACP pair).
See the notes under Table 2.3 for important information on 9900 subsystems which contain 180-GB HDDs.
3. 3390-3 and 3390-3R LVIs cannot be intermixed in the same 9900 subsystem.