HP DL360 ProLiant High Availability: The IT Imperative - Page 4

SPECIAL ADVERTISING SECTION cooling & power There are two types of cooling redundancies. One allows users to run their server until they shut it down and replace the failed fan. The other maximizes server availability by permitting the failed fan to be changed while the system is still functioning. HP performs hundreds of system tests on each of its ProLiant servers. During these tests, the fans are independently stress tested. For greater reliability, only fans with ball bearings are used. HP servers include counter-rotating fans with fixed stators, designed to produce greater airflow at higher flow impedances and a more uniformly directionalized airflow. ProLiant servers allow the addition of a redundant power supply, or removal of an existing redundant power supply for servicing at any time without interrupting server operation. Having a redundant power supply protects the server against the failure of a power supply, as well as the failure of the AC line cord. When a server is equipped with two power supplies, each provides approximately half of the power required by the system. This helps to reduce component stress, which enhances overall reliability. Smart Array controllers In this context, RAID refers to Redundant Array of Independent Disks. RAID technology allows a group of disk drives to be tied together to function as a single logical disk drive, providing increased performance and availability. HP's Smart Array controllers are integrated on ProLiant servers, and support a variety of RAID types including RAID 1+0 and RAID 5. Developed and patented by HP, RAID 6 Advanced Data Guarding (ADG) is further supported on Smart Array controllers. This technology creates two sets of parity striped data across the disks to help ensure the system can withstand multiple disk failures without data loss. RAID ADG enables high levels of fault tolerance in a cost-effective manner. Base hot plug fans Redundant hot plug fan slots Duplex drive backplane option Six Ultra320 SCSI hot plug hard drives figure 3. HP ProLiant DL380 G4 server Up to 12 MB DDR-2 SDRAM with online Up to 2 Intel® Xeon™ processors with an spare and advanced ECC capabilities 800 MHz FSB and 1 MB of L2 Cache Base hot plug power supply Redundant hot plug power supply Dual gigabit NICs Integrated smart array U320 array controller, optional 128 MB BBWC A RAID array controller will store data temporarily in cache memory during data transfers. If a power interruption occurs after data has been written to cache memory and before it is written to a disk, the cached data will be lost. To avoid this problem, HP's Smart Array controllers support redundant adapters, and advanced network adapter teaming capabilities such as fast path failover. Highly available servers also require functionality such as HP's industry leading memory protection and Smart Array controllers, as well as advanced cooling and power technologies. And remote MOST IMPORTANT Cost Effectiveness (cost per usable capacity) SECONDARY IMPORTANCE fault tolerance ▼ performance ▼ Fault Tolerance cost effectiveness ▼ performance ▼ Performance cost effectiveness ▼ fault tolerance ▼ figure 4. RAID selection guide RAID LEVEL CHOICE RAID 6 (Advanced Data Guarding from HP) RAID 5 (RAID 0 if fault tolerance is not needed) RAID 6 (Advanced Data Guarding from HP) RAID 1+0 RAID 5 (RAID 0 if fault tolerance is not needed) RAID 1+0 battery-backed cache, providing battery backup for up to four days. Once the power has been restored, the data in the cache is then moved to a disk. making the right choices Companies of all sizes and industry types are increasingly adopting a non-stop approach to business operations. To support this approach, IT organizations must continually improve component availability. HP ProLiant servers are the cornerstone of a reliable IT infrastructure. When selecting a server, IT organizations should look for features like redundant server management capability allows the user to quickly address server requirements from any location. These features ensure that HP ProLiant servers provide the availability required by today's business environment. HP (NASDAQ "HPQ") is a technology solutions provider to consumers, businesses and institutions globally. The company's offerings span IT infrastructure, global services, business and home computing, and imaging and printing. Intel (NASDAQ "INTC"), the world's largest chip maker, is also a leading manufacturer of computer, networking and communications products. For more information on ProLiant servers and increasing server availability, visit www.hp.com/go/proliantavailability or call 1-866-625-4090 4a © Copyright 2005 Hewlett-Packard Development Company, L.P. and Intel Corporation. Intel, the Intel logo, Intel Inside, the Intel Inside logo, Pentium, Itanium, Intel Xeon, Intel NetBurst and Intel SingleDriver are trademarks or registered trademarks of Intel or its subsidiaries in the United States and other countries. Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation. *Other names and brands may be claimed as the property of others. 5983-0552ENUC