Fibre Channel disk subsystem
63
Symmetrix DMX-3 Hardware
Link control cards
(LCC)
The link control card’s main function is to provide services to the
drive enclosure, which includes the capability to control functionality
and monitor environmental status. Each drive enclosure has two
LCCs. The LCC performs the following functions:
â—† Individual Fibre Channel disk poweron and poweroff functions
â—† Loop configuration control
â—† Failover control
â—† Marker LED control
â—† Individual disk port control
â—† Drive presence detection
â—† Reporting of temperature and voltage status information
â—† RS-232 monitoring of the BBU modules that support the
components in the storage bay
Power supply/
cooling module
Two power supply/cooling modules provide all necessary power
and cooling to the 15 disk drives in the disk enclosure in an N+1
configuration.
Table 11 Symmetrix DMX-3 disk drive features
a
Disk capacity
and
rotational speed
73 GB
10 K / 15 rpm
146 GB
10 K / 15 K rpm
300 GB
10 K / 15K rpm
450 GB
15K
500 GB
7.2 K rpm
Interface
maximum data
transfers per port
2 Gb/s FC 2 Gb/s FC 2 Gb/s FC 2 / 4 Gb/s FC 2 Gb/s FC
Internal data rate
megabits per
second
b
470–944/685–1,142 470–944/685–1,142 470/944 1.95 Gb/s (max) 470/944
Average access
time (read/write)
ms
a
4.7–5.4/3.5–4.0 4.7–5.4/4.7–5.4 4.7/5.4 3.4–4.1 8.5/9.5
Device-level data
buffer
16 MB 32 MB 32 MB 16 MB 32 MB
a. Contact your EMC Sales Representative for the latest drive specifications.
b. These specifications are subject to change.
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