SAN basics: All the tools you need to purchase a storage-area network
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The HP 3PAR StoreServ 20000 Storage family of SAN arrays is suitable for large data centers that require massive...
storage capacity coupled with high performance. There are two models: StoreServ 20800, which supports mechanical hard disk drives (HDDs) and flash-based solid-state drives (SSDs), and StoreServ 20850, which supports only SSDs. Both arrays include flash cache, data redundancy and HP's Mesh-Active architecture.
StoreServ 20800 supports up to 1,920 HDDs and 1,024 SSDs, providing a maximum raw capacity of 6.597 petabytes (PB). It supports HDDs in capacities of 300 GB, 600 GB, 1.2 TB, 1.8 TB, 2 TB, 4 TB and 6 TB. These drives can be SAS drives running at 10,000 rpm or 15,000 rpm, or near-line SAS drives running at 7,200 rpm. Multilevel cell (MLC) SSDs are supported in capacities of 480 GB, 920 GB, 1.92 TB and 3.84 TB. The system fits up to 80 drive enclosures. Each enclosure fits 24 small form-factor 2.5-inch drives or 12 large form-factor 3.5-inch drives. HP recommends a minimum of four drives per enclosure.
The StoreServ 20000 Storage family of SAN arrays have up to 16 six-core processors at 2.5 GHz, a maximum flash cache of approximately 35 TB and a total cache of approximately 37 TB.
StoreServ 20850 is an all-flash SAN array with support for up to 1,024 SSDs, yielding 4.323 PB of maximum raw capacity. Like the 20800 model, StoreServ 20850 supports MLC SSDs in capacities of 480 GB, 920 GB, 1.92 TB and 3.84 TB. It can have up to 48 enclosures, with the same capacity per enclosure as the 20800.
StoreServ 20850 SAN arrays use up to 16 eight-core processors at 2.5 GHz, and have a maximum cache of approximately 3.95 TB. Because the system uses no mechanical drives, the entire cache is flash-based.
Both models in the HP 3PAR StoreServ 20000 Storage family support RAID 0, RAID 1 and RAID 5. Both models also support multiparity RAID, which is the HP operating system implementation of Fast RAID 6. This technology uses distributed parity to ensure data integrity. RAID MP is a double-parity RAID architecture, which stores two different parity values that can be used to check data integrity in the event of two drive failures.
Both the 20800 and 20850 models have a maximum of 160 host ports, all of which can be used as 16 Gbps Fibre Channel. Alternatively, 80 of the host ports can be used as 10 Gbps iSCSI or 10 Gbps Fibre Channel over Ethernet, and 48 can be used as 10 Gigabit Ethernet. The HP Mesh-Active architecture used in the 20000 Storage family arrays is a departure from traditional active-active arrays, which pass the load of a failed node to existing nodes. Mesh-Active architecture allows the load from the failed node to be handled by multiple nodes on the system.
Pricing for HP 3PAR StoreServ 20000 Storage arrays depends on configuration, but is expected to start at approximately $75,000. A three-year warranty, which covers part replacements, on-site maintenance and labor costs, is included.
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