GLYPH<SM590000> Air-cooled system: radiator with redundant ( N +1) pumps. 

z14 servers implement true N +1 redundancy on pumps and blowers for the radiator. The radiator cooling system can support one and two CPC drawers simultaneously with a redundant design that consists of two pumps and two blowers. One active pump and blower can support the entire system load. If you have three or four CPC drawers, one extra blower is available, and one active pump and two blowers can support the entire system load. The replacement of a pump or blower causes no performance effect. 

GLYPH<SM590000> Water-cooled system: N+1 Water-Cooling Units (WCUs). 

A water-cooling system is an option in z14 servers with WCU technology. Two redundant WCUs run with two independent chilled water feeds. One WCU and one water feed can support the entire system load. The water-cooled configuration is backed up by the rear door heat exchangers in the rare event of a problem with the chilled water facilities of the customer. 

GLYPH<SM590000> Hot-swap IFB hub cards. 

When correctly configured for redundancy, hot swapping (replacing) the IFB (HCA2-O [12xIFB] or HCA3-O [12xIFB]) hub cards is possible. This process avoids any interruption when you must replace these types of cards. 

GLYPH<SM590000> Redundant 1 Gbps Ethernet service network with virtual LAN (VLAN). 

The service network in the system gives the machine code the capability to monitor each internal function in the system. This process helps to identify problems, maintain the redundancy, and concurrently replace a part. Through the implementation of the VLAN to the redundant internal Ethernet service network, these advantages are improved, which makes the service network easier to handle and more flexible. 

GLYPH<SM590000> The PCIe I/O drawer is available for z14 servers. It and all of the PCIe I/O 

drawer-supported features can be installed concurrently. 

GLYPH<SM590000> Memory interface logic to maintain channel synchronization when one channel goes into replay. z14 servers can isolate recovery to only the failing channel. 

GLYPH<SM590000> Out of band access to DIMM (for background maintenance functions). 

Out of band access (by using an I 2 C interface) allows maintenance (such as logging) without disrupting customer memory accesses. 

GLYPH<SM590000> Lane shadowing function to each lane that periodically is taken offline (for recalibration). 

The (logical) spare bit lane is rotated through the (physical) lanes. This configuration allows the lane to be tested and recalibrated transparently to customer operations. 

GLYPH<SM590000> Automatic lane recalibration on offline lanes on the main memory interface. Hardware support for transparent recalibration is included. 

GLYPH<SM590000> Automatic dynamic lane sparing based on pre-programmed CRC thresholds on the main memory interface. Hardware support to detect a defective lane and spare it out is included. 

GLYPH<SM590000> Improved DIMM exerciser for testing memory during IML. 

GLYPH<SM590000> PCIe redrive hub cards plug straight in (no blind mating of connector). Simplified plugging that is more reliable is included. 

GLYPH<SM590000> ICA (short distance) coupling cards plug straight in (no blind mating of connector). Simplified plugging that is more reliable is included. 

GLYPH<SM590000> Coupling Express LR (CE LR) coupling cards plug into the PCIe I/O Drawer, which allows more connections with a faster bandwidth. 

GLYPH<SM590000> Hardware-driven dynamic lane sparing on fabric (SMP) buses. Increased bit lane sparing is featured. 

