Technical information

IBM United States Hardware Announcement 112-002 IBM is a registered trademark of International Business Machines Corporation
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Model A24 is designed to provide identical function as the N3240 Model A14, but
with the addition of a second processor control module (PCM) and the Clustered
Failover (CFO) licensed function. Model A24 also supports a maximum of 144
drives. The two PCMs are designed to provide failover and failback function, helping
improve overall availability. Model A24 is a 4U rack-mountable storage controller.
Model A24 includes:
• 4U, standard 19-inch rackmount enclosure
• 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
N3240 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 a N3240 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 The supported disk drives are:
• SATA: 250 GB, 500 GB, 750 GB, 1 TB, or 2 TB
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) SATA 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 N3240 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 N3240 system is determined by the
maximum number of disk drives supported and a maximum physical storage limit
(in TB). Both limits must be honored.