24 Installing the enclosures
Connecting controller and drive enclosures
P2000 G3 MSA System controller enclosures — available in either 24-drive (2.5”) or 12-drive (3.5”)
chassis — support up to seven drive enclosures for storage/expansion, or 149 disk drives (including
controller enclosure disks). You can also configure mix-connect drive enclosures in keeping with the
maximum disk and enclosure thresholds, according to product interoperability denoted in Table 3 on
page 26.
The firmware supports both direct and reverse SAS cabling. Reverse (fault-tolerant) cabling allows any drive
enclosure to fail — or be removed — while maintaining access to other enclosures. Fault tolerance and
performance requirements determine whether to optimize the configuration for high availability or high
performance when cabling. P2000 G3 MSA System controller enclosures support both 3 and 6Gbps
internal disk drive speeds, together with 3 and 6Gbps expander link speeds.
Controller and expansion modules are identified by <enclosure-ID><controller-ID>. When
connecting multiple drive enclosures, use reverse cabling to ensure the highest level of fault tolerance.
For example, Figure 6 on page 29 shows controller module 1A is connected to expansion module 2A,
with a chain of connections cascading down (blue). Controller module 1B is connected to the lower
expansion module (5B) of the last drive enclosure, with connections moving in the opposite direction
(green).
Connecting controller and P2000 6Gb 3.5" 12-drive enclosure
A P2000 6Gb 3.5" 12-drive enclosure, supporting 6Gbps internal disk drive and expander link speeds,
can be attached to a P2000G3MSA System FC LFF or P2000G3MSA System FC SFF controller
enclosure using supported mini-SAS to mini-SAS cables of 0.5m length (see Figure 2 on page 27).
Connecting controller and D2700 6Gb drive enclosure
A D2700 6Gb drive enclosure, supporting 6Gbps internal disk drive and expander link speeds, can be
attached to a P2000G3MSA System FC LFF or P2000G3MSA System FC SFF controller enclosure using
supported mini-SAS to mini-SAS cables of 0.5m length (see Figure 3 on page 28).
Connecting controller and MSA2000 3Gb 3.5" 12-drive enclosure
Connecting an MSA2000 3.5" 12-drive enclosure to a P2000 G3 MSA System FC LFF or P2000 G3 MSA
System FC SFF requires supported mini-SAS to SAS cables. If you connect a 3Gbps drive enclosure to a
6Gbps rated controller enclosure, data throughput occurs at the drive enclosure’s 3Gbps data rate (see
Figure 4 on page 28).
IMPORTANT: Adding a fourth drive enclosure may require a separate, longer cable. For a current list of
supported cables, check the MSA2000 G2 Quickspecs located on the HP MSA products page at
http://www.hp.com/go/msa
. Select MSA SAN Arrays, and then select your product. Quickspecs links are
located on the right.
Connecting controller and MSA70 3Gb drive enclosure
P2000 G3 MSA System controllers support MSA70 3Gb drive enclosures running firmware version 2.18 or
later.
For information about the MSA70 3Gb drive enclosure, including detailed steps to upgrade the
firmware, see the HP StorageWorks 70 Modular Smart Array Enclosure User Guide located on the
MSA2000 Software Support/Documentation CD shipped with your product, or at
http://hp.com/support/manuals
.
If you connect a 3Gbps drive enclosure to a 6Gbps rated controller enclosure, data throughput occurs at
the drive enclosure’s 3Gbps data rate (see Figure 5 on page 28).
The term “drive enclosure” denotes an enclosure containing expansion modules and disk drives. In
space-constrained diagrams, the abbreviation IOM (I/O or expansion module) is used as a synonym.
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