38 Installing the enclosures
• If you are re-installing your FDE-capable disk drive modules as part of the process to replace the
chassis-and-midplane FRU, you must insert the original disks and re-enter their FDE passphrase (see the
AssuredSAN 4004 Series FRU Installation and Replacement Guide for more information).
Network Equipment-Building System (NEBS) Level 3 compliance
Generic Requirements (GRs)
Meets the NEBS requirement of GR-1089-CORE Issue 6, port types 2, 7 & 8.
Meets the NEBS requirements of GR-63-CORE Issue 4, for the product’s intended use.
Meets the NEBS filter requirements.
IMPORTANT: Table 5 on page 41 shows degree of NEBS-compliance for individual storage enclosures.
Exceptions to GRs
Exceptions to the overall NEBS GR-63-CORE Issue 4 requirements include:
• Heat Dissipation: Environmental Criteria Section 4.1.6, Objective O4-29 and Operational Requirement
R4-31. This product exceeds the values shown in Table 4-5 for Forced-Air Fan Shelf equipment.
• The equipment does not meet the objective O4-103 for Surface Reflectance, Section 4.1.7, as it has a
black bezel that mounts to the front.
Exceptions to the overall NEBS GR-1089-CORE Issue 6 requirements include:
• None reported
Product documentation requirements
NEBS product documentation requirements applying to AssuredSAN 4004 Series controller and drive
enclosures are listed beneath “NEBS (Level 3)” in the Index — under either GR-1089-CORE Issue 6 or
GR-63-CORE Issue 4 — together with adjacent page locations. NEBS topics are integrated within the
overall content of this Setup Guide. The requirement designators in the Index have been codified for use
within index marker tags according to the following example:
NEBS generic requirement number “R2-7 [7]” appears as “R2-7.7” within the Index.
Each codified string (e.g., R2-7.7) is followed by a hyphen and brief description of the requirement. Within
the Index, click on the blue page number link to navigate to the corresponding NEBS topic.
Connecting the controller enclosure and drive enclosures
AssuredSAN 4004 Series controller enclosures—available in 24-drive (2.5") or 12-drive (3.5")
chassis—support up to eight enclosures, or a maximum of 192 disk drives. The high-density 2U
enclosure—available in the 48-drive (2.5") chassis—supports up to four enclosures, or a maximum of 192
disk drives. The high-density 4U enclosure—available in the 56-drive (3.5") chassis—supports up to eight
enclosures, or a maximum of 248 drives. The maximum number of storage enclosures cited include the
controller enclosure.
The 4004 Series enclosures support both straight-through and reverse SAS cabling. Reverse 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. AssuredSAN 4004 Series controller modules support both 3-Gbps and
6-Gbps internal disk drive speeds together with 3-Gbps and 6-Gbps expander link speeds.
CAUTION: Some 6-Gbps disks might not consistently support a 6-Gbps transfer rate. If this happens, the
system automatically adjusts transfers to those disks to 3 Gbps, increasing reliability and reducing error
messages with little impact on system performance. This rate adjustment persists until the controller is
restarted or power-cycled.
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