IBM N Series - N7 X50 T Cooling Architecture; System-Level Diagnostic Procedures; Metrocluster, Gateway, and Flexcache; N7 X50 T Guidelines

40 IBM System Storage N series Hardware Guide
4.3.3 N7x50T cooling architecture
The N7x50T cooling architecture includes the following features:
򐂰 Six fan FRUs per chassis, which is paired three each for top and bottom bays (each fan
FRU has two fans)
򐂰 One failed fan is allowed per chassis bay:
– Controller can run indefinitely with single failed fan
– Two failed fans in controller bay cause a shutdown
– Two-minute shutdown rule applies if a fan FRU is removed: Rule that is enforced on a
per-controller basis
4.3.4 System-level diagnostic procedures
The following system-level tools are present in N7x50T systems:
򐂰 SLDIAG replaces SYSDIAG: Both run system-level diagnostic procedures
򐂰 SLDIAG has the following major differences from SYSDIAG:
– SLDIAG runs from maintenance mode: SYSDIAG booted with a separate binary
– SLDIAG has a CLI interface: SYSDIAG used menu tables
򐂰 SLDIAG used on all new IBM N series platforms going forward
4.3.5 MetroCluster, Gateway, and FlexCache
MetroCluster and Gateway configurations include the following characteristics:
򐂰 Supported MetroCluster two-chassis configuration
򐂰 Single-enclosure stand-alone chassis: IBM N series N7950T-E22 controller with IOXM
򐂰 Fabric MetroCluster requires EXN4000 shelves
򐂰 The N7x50T series can also function as a Gateway
򐂰 FlexCache uses N7x50T chassis:
– Controller module (and in IOXM for N7950T)
– Supports dual-enclosure HA configuration
4.3.6 N7x50T guidelines
The following tips are useful for the N7x50T model:
򐂰 Get hands-on experience with Data ONTAP 8.1
򐂰 Do not attempt to put vertical slot I/O system boards in horizontal expansion slots
򐂰 Do not attempt to put expansion cards in vertical I/O slots
򐂰 Onboard 10 GbE ports require feature code for SFP+: Not compatible with other SFP+ for
the two-port 10 GbE NIC (FC 1078)
򐂰 Onboard 8 Gb SFP not interchangeable with other SFPs: 8 Gb SFP+ autoranges 8 Gbps,
4 Gbps, and 2 Gbps; does not support 1 Gbps
򐂰 Pay attention when 6 Gb SAS system board in I/O slot 1
򐂰 NVRAM8 and SAS use QSFP connection