Technical information

IBM United States Hardware Announcement 112-001 IBM is a registered trademark of International Business Machines Corporation
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(CFO) licensed function. Model A22 also supports a maximum of 144 drives. The two
PCMs are designed to provide failover and failback function, helping improve overall
availability. Model A22 is a 2U rack-mountable storage controller.
Model A22 includes:
2U, standard 19-inch rackmount enclosure (A22)
Two 1.73 GHz Intel dual-core processors
Up to 12 GB random access ECC memory (6 GB per controller)
Eight integrated Gigabit Ethernet RJ45 ports
Four SAS ports
Two serial console ports
Two integrated Remote LAN Management (RLM) ports
Redundant hot-swappable, auto-ranging power supplies and cooling fans
N3220 storage controllers can attach a maximum of six FC storage expansion units,
either EXN1000 or EXN4000. The maximum number of EXN3000 SAS/SATA or
EXN3500 SAS storage expansion units that can be attached is nine. On the initial
order of an N3220 system, either SAS attached or FC attached expansion units may
be ordered, not both.
The EXN1000 storage expansion unit provides a 3U rack-mountable disk enclosure
containing 5, up to a maximum of 14, serial advanced technology attachment
(SATA) disk drives, either in 250 GB, 500 GB, 750 GB, 1 TB, or 2 TB physical
capacities. The EXN4000 storage expansion unit provides a 3U rack-mountable
disk enclosure containing 5, up to a maximum of 14, FC disk drives. The EXN4000
supports the following FC disk drive speeds and capacities:
15,000 revolutions per minute (15K RPM) of 144 GB, 300 GB, 450 GB, and 600
GB physical capacities
10,000 revolutions per minute (10K RPM) of 144 GB and 300 GB physical
capacities
The EXN3000 storage expansion unit is a 4U rack-mountable disk enclosure
containing 5, up to a maximum of 24, SAS or SATA disk drives. The supported disk
drives are:
SAS: 300 GB, 450 GB, and 600 GB physical capacities
SATA: 500 GB, 750 GB, 1 TB, 2 TB, and 3 TB physical capacities
The EXN3500 storage expansion unit is a 2U rack-mountable disk enclosure
containing 5, up to a maximum of 24, 2.5-inch, small form factor (SFF) SAS disk
drives. The supported disk drives are:
SAS: 450 GB and 600 GB physical capacities
The number of disk drives supported by the EXN1000 and EXN4000 storage
expansion units is a maximum of 14; for the EXN3000 and EXN3500 the maximum
is 24 disk drives. All must be of a particular type (rotational speed and capacity).
For the initial order of the N3220 systems, you may not include EXNx000 storage
expansion units containing more than two types (rotational speed and capacity) of
disk drives.
The maximum raw storage capacity of the N3220 system is determined by the
maximum number of disk drives supported and a maximum physical storage limit
(in TB). Both limits must be honored.
The following table describes the maximum supported total physical storage capacity
for the N3220 Model A12 and Model A22: