Chapter 4. High-end systems 414.2.4 N7950T cooling architectureThe following are details about the N7950T cooling architecture: Six fan FRUs per chassis, paired three each for top and bottom bays– Each fan FRU has two fans One failed fan 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 enforced on a per-controller basis4.2.5 System-level diagnostic proceduresThe following system-level tools are present in N7950T systems: SLDIAG replaces SYSDIAG– Both run system-level diagnostic procedures SLDIAG has these 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 IBM N series N6200 series and all new platforms going forward4.2.6 N7950T supported back-end storageThe following back-end storage is supported: Shelves and modules– EXN3500: 2U 24 drive SFF SAS– EXN3000: 4U 24 drive SAS / SATA– EXN4000: 4U 14 drive Fibre Channel– EXN1000: 4U 14 drive SATA Any HDDs supported in listed shelves New 100 GB SSDs supported in the EXN3000 shelves4.2.7 MetroCluster, Gateway, and FlexCacheMetroCluster and Gateway configurations have these 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 N7950T series also functions as a Gateway
