HP XP20000/XP24000 Konfigurationshandbuch - Seite 12

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Multimode optical cables with SC or LC connectors

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Public or private arbitrated loop (FC-AL) or direct fabric attach

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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

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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

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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.

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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

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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 XP Snapshot or Continuous Access Journal) are only supported with OPEN-V.

Refer to

Table 8

In a Linux environment, one LUN can be divided into a maximum of four primary partitions (using

fdisk) or maximum of one extended partition.

The disk arrays support many standard software products that provide host, application, or I/O path

failover and management.

Installing and configuring Linux for the XP disk array

on page 30 for detailed information.