Dell AX4-5 Spezifikationen PDF herunterladen (Seite 32)

FC storage systems. Please note that remote replication software (MirrorView and SAN Copy) is supported

on CLARiiON iSCSI storage systems:

CLARiiON replication considerations with VMware ESX Server

Please note that:

• Use of RDM volumes for replication is not supported when an ESX 2.5.x server is booted from a SAN

LUN. In other words, when the Fibre Channel HBAs are shared between the service console and the

virtual machines, RDM cannot be configured on an ESX 2.5.x server. There is no such restriction with

VMware ESX 4.0/3.x/ESXi.

• admsnap and admhost must be installed on the virtual machines and not the ESX Server service

console.

• With ESX 2.5.x, ensure that a CLARiiON snapshot, clone, or mirror is not in a device not ready state

(snapshot not activated, session not started, clone not fractured, or secondary mirror not promoted)

when it is assigned to an ESX server. The ESX service console does not create a device file for a LUN

in this state. This restriction only applies at the ESX service console level and not the virtual machine

level. Users can execute activate and deactivate operations at the virtual machine level using

admsnap and admhost utilities after the ESX server sees the device the first time. For an AX100

system running Navisphere Express and connected to an ESX 2.5.x server, the replica must be

presented to a secondary physical server (and not an ESX server) since the replica cannot be activated

through the Navisphere Express GUI. There is no such restriction with VMware ESX 4.0/3.x/ESXi; it

sees the snapshot, clone, or mirror in spite of the device’s not ready condition.

CLARiiON replication software considerations when using VMFS volumes

Please note that:

• The virtual disks in a VMFS-2 volume must be in persistent mode during the replication process.

• When using VMFS-2 volumes, do not present two copies of the same VMFS volume to the same ESX

server. For example, an ESX server participating in VMotion with the primary ESX server has access

to the original source LUNs. Hence, this ESX server should not be a target when a replica is presented.

With VMFS-3 volumes on ESX 3.x/ESXi, the replica can be presented to the same ESX server or a

standby ESX server. This can be done using VMware vCenter by enabling the

LVM.EnableResignature parameter in the ESX server. After a rescan, the replica is resignatured and

can be assigned to a virtual machine.

See the “Automatic Volume Resignaturing” section in the Fibre Channel SAN Configuration Guide on

www.vmware.com.

With VMFS-3 volumes on ESX 4.0/4i, the replica can be presented to the same ESX server or a

standby ESX server. ESX 4.0 supports selective resignaturing at an individual LUN level and not at the

ESX level. After a rescan, the user can either keep the existing signature of the replica (LUN) or can

resignature the replica (LUN) if needed. See the “Managing Duplicate VMFS Datastores” section in

the Fibre Channel SAN Configuration Guide on

www.vmware.com.

• When replicating an entire VMFS (VMFS-2 and VMFS-3) volume that contains a number of virtual

disks on a single CLARiiON LUN, the granularity of replication is the entire LUN with all its virtual

disks.

• CLARiiON VSS Provider is not supported on VMFS volumes.

• When making copies of VMFS volumes that span multiple CLARiiON LUNs, use the array-based

consistency technology.

• ESX Server-based VM snapshot copies should not be used in conjunction with CLARiiON replication

software copies on the same VMFS volume for ESX 2.5.x since VM snapshot copies require the

virtual disk to be in nonpersistent mode.

• Most of the admsnap and admhost commands when issued on VMFS volumes will fail since VMFS

volumes do not support SCSI pass-through commands to communicate with the CLARiiON storage

EMC CLARiiON Integration with

VMware ESX Server

Applied Technology 32

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