EMC CX500I Configuration Guide - Page 121
Storage Processor (SP), Storage-System, Caching
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Storage-System Hardware Storage Processor (SP) The SP provides the intelligence of the storage system. Using its own proprietary software (called FLARE™ Operating Environment), the SP processes the data written to or read from the disk modules, and monitors the modules themselves. A CX700 SP consists of a printed-circuit board with memory modules, a board that provides SAN features (called a personality board), and status lights. For Fibre Channel storage systems, each SP has front-end ports to communicate with switches or servers and back-end ports to communicate with disks. A CX300 DPE2 SP has two front-end ports and one back-end port; a CX500/CX500i DPE2 SP has two front-end ports and two back-end ports; a CX700 SPE SP has four front-end ports and four back-end ports. For CX500i storage systems, each SP has two iSCSI front-end ports that communicate either through a Gigabit Ethernet LAN to clients or directly to an iSCSI HBA or a Gigabit network interface card (NIC) card in a client system. Like the CX500, each SP in a CX500i has two Fibre Channel back-end ports to communicate with disks. For high availability, a storage system comes with two SPs. The second SP provides a second route to a storage system and also lets the storage system use write caching (described in Storage-System Caching on page 6-6) for enhanced write performance. Server Server Server Adapter Adapter Adapter Adapter Adapter Adapter Path 1 Path 2 LAN/Switch SP A SP B Storage System Figure 6-3 Shared Storage Systems LAN/Switch SP A SP B Storage System EMC1810a Hardware for CX300, CX500, CX500i, and CX700 Storage Systems 6-5