VMware VC-SRM4-A - vCenter Site Recovery Manager Manuel d'utilisateur télécharger pdf (Page 22)

Improving VMware Disaster Recovery with EMC RecoverPoint

• Full copy: Can significantly speed up the process of deploying virtual machines.

Implemented via the xcopy SCSI command.

• Block zero: May speed up bulk zeroing of a disk. Also called copy same.

• Hardware-assisted locking: Implements a LUN locking mechanism that is

more efficient in the clustered host environment. Also called Atomic Test and

Set. Implemented using the Compare and Swap SCSI command.

Notice:

Failure to disable an unsupported VAAI command may lead to data

corruption, production data being unavailable to ESX hosts, degraded

performance, or switch reboot.

RecoverPoint splitters support each VAAI command at one of the following levels:

• Unsupported. If the RecoverPoint splitter does not support a particular VAAI

command, it must be disabled on all ESX servers. Failure to disable an

unsupported VAAI command may lead to data corruption, production data being

unavailable to ESX hosts, degraded performance, or switch reboot.

• Rejected. When RecoverPoint blocks or rejects the use of a VAAI command,

VMware automatically immediately reverts to legacy behavior, with no risk to data

or performance.

• Supported. RecoverPoint supports the VAAI command and its functionality.

Table 2. VAAI commands supported by RecoverPoint, according to

write-splitter type

Feature

Windows host-

based write

splitter

Brocade write

splitter

Cisco-

SANTap

write

splitter*

VNX-based

write splitter

Symmetrix

VMAXe write

splitter

CLRiiON-

based write

splitter

Full copy

Unsupported

Rejected

(FLARE 30)

Supported

(FLARE 31 or

later)

Rejected

Block

zeroing

Unsupported

Rejected

(FLARE 30)

Supported

(FLARE 31 or

later)

Rejected

Hardware-

assisted

locking

Unsupported

Rejected

Supported

* Requires SSI 5.0(4j) and later or SSI 4.2(3k) and later in 4.2 series, prior releases or versions are unsupported

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