HP StorageWorks XP12000 HP StorageWorks XP Disk Array Configuration Guide: IBM - Page 8
Device emulation types, Failover, SNMP configuration, OPEN-x devices, LUSE devices OPEN-x*n
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• Connection speeds of 1 Gbps, 2 Gbps, and 4 Gbps • Short-wave non-OFC (open fiber control) optical interface • Multimode optical cables with SC or LC connectors • Public or private arbitrated loop (FC-AL) or direct fabric attach • Fibre Channel switches Even though the interface is Fibre Channel, this guide uses the term "SCSI disk" because disk array devices are defined to the host as SCSI disks. Device emulation types The XP family of disk arrays and the SVS 200 support these device emulation types: • OPEN-x devices: OPEN-x logical units represent disk devices. Except for OPEN-V, these devices are based on fixed sizes. OPEN-V is a user-defined size based on a CVS device. Supported emulations include OPEN-3, OPEN-8, OPEN-9, OPEN-E, OPEN-L, and OPEN-V devices. • LUSE devices (OPEN-x*n): Logical Unit Size Expansion (LUSE) devices combine 2 to 36 OPEN-x devices to create expanded LDEVs larger than standard OPEN-x disk devices. For example, an OPEN-x LUSE volume created from ten OPEN-x volumes is designated as OPEN-x*10. • CVS devices (OPEN-x CVS): Volume Size Configuration (VSC) defines custom volumes (CVS) that are smaller than normal fixed-sized logical disk devices (volumes). (OPEN-V is a CVS-based custom disk size that you determine. OPEN-L does not support CVS.) Although OPEN-V is a CVS-based device, the product name in the SCSI inquiry string is OPEN-V opposed to the fixed size OPEN[389E] devices that appear as OPEN-x-CVS. • LUSE (expanded) CVS devices (OPEN-x*n CVS): LUSE CVS combines CVS devices to create an expanded device. This is done by first creating CVS custom-sized devices and then using LUSE to combine from 2 to 36 CVS devices. For example, if three OPEN-9 CVS volumes are combined to create an expanded device, this device is designated as OPEN-9*3-CVS. OPEN-V devices are designated as OPEN-V*n (without CVS). NOTE: For the SVS 200, and the XP24000/XP20000/XP12000/XP10000 when connected to external storage devices, HP recommends using OPEN-V as the emulation the array makes visible to the host. This allows configuration of external storage LDEVs without losing data. Using any other emulation may cause data loss in the external storage LUNs. For new deployments, OPEN-V should be chosen because some features (such as HP StorageWorks XP Snapshot Software or HP StorageWorks XP Continuous Access Journal Software) are only supported with OPEN-V. For detailed information, see "Disk array supported emulations" on page 33. Failover The disk arrays support many standard software products that provide host, application, or I/O path failover and management. SNMP configuration The XP family of disk arrays and the SVS 200 support standard Simple Network Management Protocol (SNMP) for remotely managing arrays. The SNMP agent on the service processor (SVP) performs 8 Installing and configuring AIX for the XP disk array