IBM System x3850 X5 Implementation Manual page 388

Fibre Channel over Ethernet (FCoE)
This relatively new interface was introduced to provide an easier method for FC storage
environments to take advantage of the high performance 10 Gb Ethernet interface. Data
communication uses FC protocol over a 10 Gb Ethernet interface. System setup for FCoE
requires a Converged Network Adapter (CNA) on the servers to pass both network and
FC storage data via 10 Gb network infrastructure. The attached storage system, for
example, IBM System Storage DS3400, DS4000 series, DS5000 series, and so on,
requires the available FC interface.
FCoE competes with iSCSI to be the predominant SAN protocol that works on the
Ethernet interface.
Serial Attached SCSI (SAS)
For smaller environments not requiring complex SAN configuration, using a SAS cluster is
a more cost-effective alternative to an FCoE or iSCSI. Although performance,
manageability, and distance are limited compared to the other solutions, servers can
access their individual portions of the storage system. Typical requirements are the SAS
HBA on the servers and a storage system with a SAS interface, for example, IBM System
Storage DS3200 and others.
Booting from SAN
The implementation of the SAN storage environment presents the possibility of running the
OS from the SAN. This feature offers several advantages:
Reduces downtime and increases host application availability. If a server fails, it can be
replaced with another server with minimal effort.
Utilizes SAN and System Storage advanced features. Most storage and SAN solutions
offer better features compared to using local disk.
Improves system and host reliability by removing mechanical parts from the server.
Tip: Prepare the hardware infrastructure and cabling before performing a SAN boot OS
installation, and make sure to provide only one path to the storage during the process. Use
the proper zoning configuration or disconnect the physical cable to provide only one path to
the storage during the process.
IBM Redbooks references
In regard to System x3690 X5 connectivity with SAN storage, many IBM Redbooks
publications are available. The following books describe IBM System Storage products and
their various implementations, including with the IBM System x product lines:
IBM System Storage Solutions Handbook, SG24-5250
This book provides overviews and pointers for information about the most current IBM
System Storage products.
http://www.redbooks.ibm.com/abstracts/sg245250.html
Implementing an IBM/Brocade SAN with 8 Gbps Directors and Switches, SG24-6116
This book consolidates critical information while also covering procedures and tasks that
you are likely to encounter on a daily basis when implementing an IBM/Brocade SAN.
http://www.redbooks.ibm.com/abstracts/sg246116.html
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IBM eX5 Implementation Guide