Dell DAE Installation Manual download pdf (Page 29)

little performance advantage to splitting the disks across all the buses, so configuring the disks

across all different buses is not worth the added complexity.

Back-end connectivity

Back-end connectivity is controlled by the EMC installer to help minimize complexity and

maximize balance of the number of disks on a pair of back-end buses.

Let Dell/EMC CX Series manage its own back end connectivity.

Clustering

EMC supports several clustering products. Fundamentally, cluster support can be accomplished

on a Dell/EMC CX Series by sharing common LUNs in the Storage Group. If the members of the

cluster need their own separate storage, separate Storage Groups must be used and the

common LUN is put into both Storage Groups. A host can only be in one Storage Group per

storage system, but LUNs can be in multiple Storage Groups. When LUNs are shared between

the hosts, it is up to the sharing hosts to manage the data integrity of shared LUNs. Therefore

create two Storage Groups—one for each host—and put the shared LUNs in both Storage

Groups. When selecting the LUNs for the second Storage Group, select all in the show LUNs

box and select the shared LUNs. When you select all a warning informs you that “multiple hosts”

will be able to see the LUNs. Click OK. Be sure that the LUNs selected in the Navisphere UI for

the second host’s Storage Group are selected in the same order as the selections in the first

host’s Storage Group. Selecting the LUNs in a different order may cause problems with the

cluster software.

Choose a Storage Group name that reflects the host and cluster name. For example, you might

call the Storage Group containing the first host in a Sun cluster: Host1-of-Suncluster.

The following sections show the supported cluster software. Cluster software is host or OS

based. Typically cluster software uses local copies of the data and does not participate in remote

copies of the data. Clusters with Dell/EMC CX Series do not typically use Dell/EMC CX Series

replication software for heartbeats. Shared disks can be used as heartbeat or mailbox storage,

but that does not depend on any Dell/EMC CX Series-specific capability other than shared drives.

Heartbeats/mailboxes for the cluster must be shared drives.

Sun clusters

Do not use Sun Cluster if Solaris is booting from the Dell/EMC CX Series.

You must use FC-SW to support OPS, RAC, or greater than two-node clusters.

Some Solaris 9 clustered environments require patches. Refer to the EMC Support Matrix for

patch listings for particular hosts and configurations.

VERITAS clusters

Do not use VERITAS Cluster if Solaris is booting from the Dell/EMC CX Series.

IBM clusters

Two IBM Cluster packages are available to users: HACMP and GPFS.

HACMP

Booting from the Dell/EMC CX Series is allowed in HACMP clusters. These boot drives should be

only available to that host.

GPFS

GPFS configurations usually span multiple hosts and storage systems to create the parallel file

systems structure. These configurations are usually in the 40–100 TB size range. Multiple

Dell/EMC CX Series Initial Configuration

Best Practices Planning 29

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