User manual HP STORAGEWORKS XP20000/XP24000 DISK ARRAY STORAGEWORKS XP20000 DISK ARRAY SITE PREPARATION GUIDE (AE190-96008, JUNE 2008)

[. . . ] HP StorageWorks XP20000 Disk Array Site Preparation Guide Part number: AE190-96008 Fourth edition: June 2008 Legal and notice information © Copyright 2008 Hewlett-Packard Development Company, L. P. , all rights reserved. Valid license from HP required for possession, use or copying. Consistent with FAR 12. 211 and 12. 212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U. S. Government under vendor's standard commercial license. [. . . ] · Use a raised floor system (254 to 305 mm, 10 to 12 in) for the most favorable room air distribution system. · Grid panels must be at least 450 x 450 mm (17. 72 x 17. 72 in). · The floor must have a load rating between 300 and 500 kg per square meter (553 to 921. 7 lb per square yard, or 61. 4 to 102. 4 lb per square foot). The maximum floor loading at any point is 500 kg (1102. 3 lb). XP20000 Disk Array Site Preparation Guide 25 Estimating required floor load rating To estimate the required load rating for your floor, consider the total weight of all of these items: · · · · · The disk array (see "Component weights" on page 19) Other equipment Furniture such as desks, chairs, and storage cabinets Computer room personnel Moving equipment, such as forklifts, dollies, and similar items The lower the floor load rating, the more clearance is required around the array to distribute the equipment weight correctly. If your computer room is too small to allow for minimum required clearance around the array, you may need to increase the floor load rating. For more on required clearance, see "Floor clearance requirements" on page 26. Floor covering requirements HP recommends a tiled floor. CAUTION: HP strongly discourages the use of carpeting, including antistatic varieties, within 6. 0 m (20 ft) of the disk array. Over time, carpeting may shed dust that can cause problems with the disk array. CAUTION: If your computer room has carpeting, place static discharge mats so that personnel must walk across them before touching any part of the array. Failure to comply with this precaution can result in equipment damage through static discharge. Floor clearance requirements The total floor clearance required for the disk array includes: · The actual space required by the equipment (shown in Figure 2). · Service clearance -- the floor space required to access the disk array. The service clearance for the XP20000 rack is 30 inches in the rear and 48 inches in the front. · Additional space required to properly distribute the equipment weight on your computer room's floor. The amount of additional space required depends on your floor load rating. For more information, see "Estimating required floor load rating" on page 26. 26 Site requirements for the HP XP20000 Disk Array Figure 2 Rack assembly footprint Environmental requirements The environmental specifications for operating your disk array must be satisfied before installation. Altitude requirements The maximum altitude for disk array operation is 3, 000 meters. For nonoperational or storage situations, the maximum altitude is 4, 000 meters. Air conditioning requirements Use separate computer room air conditioning duct work. If it is not separate from the rest of the building, it might be difficult to control cooling and air pressure levels. Duct work seals are important for maintaining a balanced air conditioning system and high static air pressure. Adequate cooling capacity means little if humidity levels increase when the ducts are exposed to warm air, producing condensation. Condensation on any disk hardware can damage the components. Any questions regarding the adequacy of airflow construction should be referred to and evaluated by a qualified structural engineer. Temperature specifications Table 4 Temperature specifications Temperature range type Recommended operating temperature Range 21 to 24 degrees C 70 to 75 degrees F 16 to 32 degrees C 61 to 89 degrees F ­10 to +43 degrees C 14 to 109 degrees F Specified operating temperature Nonoperating temperature XP20000 Disk Array Site Preparation Guide 27 Temperature range type Shipping and storage temperature (product packed in factory packing) Temperature shock immunity (maximum rate of temperature change) Range ­25 to +60 degrees C ­13 to +140 degrees F 10 degrees C per hour 18 degrees F per hour Humidity specifications Maintain the humidity levels specified in Table 5. High humidity levels cause galvanic actions to occur between some dissimilar metals. This eventually causes a high resistance between connections, leading to equipment failure. [. . . ] Physically, a processor, which is an element of a cluster system. A parity group is a disk configuration in which multiple disks work together to provide redundancy. Synonymous with "array group. " Power control interface or peripheral component interconnect. A physical connection that allows data to pass between a host and the disk array. [. . . ]