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14 HP StorageWorks Disk Array XP Operating System Configuration Guide: HP-UX
Device emulation types
The XP family of disk arrays supports these device emulation types:
• OPEN-K/3/8/9/E 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. 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-K/3/8/9/E 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.)
• 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.
Failover
The XP family of disk arrays supports many standard software products
that provide host, application, or I/O path failover and logical volume
(storage) management.
The following are supported for HP-UX:
• HP Multi-Computer/ServiceGuard (MC/ServiceGuard) software for
application failover
• Alternate link for I/O path failover (included in HP-UX)
• Logical volume management (included in HP-UX)