Hitachi AMS 2100, Hardware Manual

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Hardware components
4–3
Hitachi AMS 2100/2300 Storage System Hardware Guide
Disk drives
As shown by item #1 in Figure 4-1 , an AMS 2100/2300 has 15 drive slots
in the front of the array. Each slot can accommodate one SATA drive or one
SAS drive.
Disk drive configurations
The following requirements are for both the AMS 2100 and the AMS 2300
base units. See the section on expansion units for configuration information
about them.
• The minimum number of drives that must be installed in the base unit
is four. The first four drives must be installed in slots 0 - 3 and must be
either all SAS drives or all SATA drives.
• The minimum number of disk drives in an expansion unit is two. These
must be installed in slots 0-1 and must both be either SAS or SATA
drives.
• After the minimum configuration is met in the base unit or the
expansion unit, you can add up to two SAS or two SATA drives (which
makes a RAID 1 configuration) at a time, or other combinations of
drives as required to meet the RAID configurations specified in RAID
implementations on page 1-22 .
Disk drive status LEDs
The base unit has two LEDs that are built into the unit chassis above each
disk drive slot. These LEDS, shown in Figure 4-2 , indicate the status of the
drive that is installed in the slot below them. The number in the triangle is
the slot number of the disk drive.
Figure 4-2: Disk Drive Status LEDs
Table 4-2: Disk Drive Status LEDs
Item Description Item Description

ALarM LED (red)
Lights when the drive has a
serious error.

ACTive LED (green)
Lights or flashes when the drive is
operating and is being read from or
written to. It indicates that the disk
drive is operational.