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You might want more, smaller LUNs for the following reasons:

•

Less wasted storage space.

•

Different applications might need different RAID characteristics.

•

More flexibility, as the multipathing policy and disk shares are set per

LUN.

•

Use of Microsoft Cluster Service requires that each cluster disk resource is

in its own LUN.

•

Better performance because there is less contention for a single virtual

disk.

When the storage characterization for a virtual machine is not available, there

is often no simple answer when you have to decide on the LUN size and

number of LUNs to use. You can experiment using either predictive scheme

or adaptive scheme.

Using the Predictive Scheme to Make LUN Decisions

When you plan how to set up your storage for your ESX/ESXi systems before

you format LUNs with VMFS datastores, you must decide on the LUN size

and number of LUNs to use.

To make LUN decisions using the predictive scheme:

1 Create several LUNs with different storage characteristics.

2 Build a VMFS datastore on each LUN, labeling each datastore according to

its characteristics.

3 Allocate virtual disks to contain the data for virtual machine applications

in the VMFS Datastores built on LUNs with the appropriate RAID level

for the applications' requirements.

4 Use disk shares to distinguish high-priority from low-priority virtual

machines.

5 Disk shares are relevant only within a given host. The shares assigned to

virtual machines on one host have no effect on virtual machines on other

hosts.

6 Run the applications to determine whether virtual machine performance is

acceptable.

Dell MD Storage Array vCenter Plug-in