Device Emulation Types; Failover; Snmp Configuration - HP XP20000/XP24000 Configuration Manual

• Short-wave non-OFC (open fiber control) optical interface
• Multimode optical cables with LC connectors
• Direct connect (PriNL) or fabric switch connect (N-port or DFA)
• 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 supports 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).
Refer to "Emulation

Failover

The NonStop system architecture, by default, provides two paths to each LDEV for failover, and can
be further enhanced with host mirroring.

SNMP configuration

The XP family of disk arrays supports standard Simple Network Management Protocol (SNMP) as an
aid for disk array management. The SNMP agent on the service processor (SVP) performs error
reporting operations requested by the SNMP manager. SNMP properties are usually set from the SVP
but they can also be set remotely using XP Remote Web Console, XP Command View, or XP Command
View Advanced Edition. Refer to the applicable user's guide for procedures.
12 Installing and configuring NonStop for the XP disk array
specifications" on page 23 for detailed information.