HP XP20000/XP24000 HP StorageWorks XP Disk Array Configuration Guide: Tru64 UN - Page 8

Device emulation types, Failover, SNMP configuration, OPEN-x devices, LUSE devices OPEN-x*n - / disk array

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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). NOTE: For 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 XP Snapshot or Continuous Access Journal) are only supported with OPEN-V. Refer to Table 8 on page 29 for detailed information. Failover The XP family of disk arrays supports many standard software products that provide host, application, or I/O path failover and management. TruCluster is one of the supported applications. CAUTION: Tru64 5.1B and later fully support dynamic load balancing and failover when multiple FCAs are connected to the same LUN. This feature is ONLY available with version 5.1B and later. SNMP configuration The XP family of disk arrays supports standard Simple Network Management Protocol (SNMP) for remotely managing the disk array. The SNMP agent on the 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, or XP Command View. For procedures, refer to the applicable user guide available at: 8 Installing and configuring Tru64 for the XP disk array

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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).
NOTE:
For 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 XP Snapshot or Continuous Access Journal) are only supported with OPEN-V.
Refer to
Table 8
on page 29 for detailed information.
Failover
The XP family of disk arrays supports many standard software products that provide host, application,
or I/O path failover and management. TruCluster is one of the supported applications.
CAUTION:
Tru64 5.1B and later fully support dynamic load balancing and failover when multiple FCAs are
connected to the same LUN. This feature is ONLY available with version 5.1B and later.
SNMP configuration
The XP family of disk arrays supports standard Simple Network Management Protocol (SNMP) for
remotely managing the disk array. The SNMP agent on the 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, or XP Command View. For procedures, refer to the
applicable user guide available at:
Installing and configuring Tru64 for the XP disk array
8