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Dell/EMC CX Seriess can be used to accommodate these configurations. This is considered

outside the 80 percent rule for best practices. Consultation is required for these configurations.

Windows clusters: Microsoft Cluster Server

Current SCSI port or SCSI miniport drivers cannot share the same path for the boot device as for

the shared cluster devices. As a result, a dedicated adapter is required for each path (if booting

from internal disk, it is already on a separate Adapter). For example, each host has its own boot

LUN and additional data LUNs that they share. A non-HA configuration requires two HBAs for

each server: one for a dedicated path to the boot device and another for a path to the data

devices. An HA configuration for the data LUNs requires three HBAs each (two data HBA paths).

An HA configuration to include the boot LUNs requires four HBAs on each server. Each Server

needs separate paths: Two HBA paths for the data and two paths for the boot LUN.

Storport can share the same path for the boot device and the shared cluster devices.

Microsoft Windows Server 2000/2003 clusters using Microsoft Cluster Services (MSCS) cannot

make use of dynamic disks. Use metaLUNs and Microsoft’s diskpart utility to provide expandable,

striped, and concatenated volumes for these systems.

Linux (RedHat) clusters

Use Enterprise Linux Cluster.

HP TruCluster

Dell/EMC CX Series requires HP TruCluster software.

SCALING: STORAGE SYSTEM SIZES

Dell/EMC CX Series storage systems can be defined many ways. Earlier sections of this white

paper defined usage profiles. This section defines three systems based on size or capacity. The

systems are: small, medium and large.

Small storage system

A small storage system consists of one to three DAEs. The first DAE will have Fibre Channel

drives. The other two can be have either ATA/SATA-II or FC drive types.

Medium storage system

A medium storage system ranges in size from four to 11 DAEs, to the maximum being a full

single rack.

Large storage system

A large system uses two or three racks, which are added footprints. The large system contains 12

to 32 DAEs. The CX3-80 can support up to 480 drives per storage system.

Host connectivity

Environment sizes are defined as follows:

• Small environments have 1 to 10 hosts.

• Medium environments have 11 to 30 hosts.

• Large environment have greater than 31 hosts.

Dell/EMC CX Series Initial Configuration

Best Practices Planning 30

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