Users Guide

For example,

A new VD is created called 2wayVD1 in the storage pool tierPool1. This VD is configured as a Two-way

mirror. The SSD and HDD tiers for this pool was created in the earlier example. Because the

StorageTiers attribute requires objects as its input, the output of the Get-StorageTier PowerShell

command is assigned to the $ssd_tier and $hdd_tier variables, and then used when creating the VD.

The

StorageTierSizes attribute is set to the size of each tier for which the VD uses the tier disk space.

$ssd_tier = Get-StorageTier -FriendlyName tierPool1_SSD

$hdd_tier = Get-StorageTier -FriendlyName tierPool1_HDD

New-VirtualDisk -FriendlyName “2wayVD1” -StoragePoolFriendlyName “tierPool1” -

ProvisioningType Fixed -ResiliencySettingName Mirror -PhysicalDiskRedundancy 1 –

StorageTiers $ssd_tier, $hdd_tier –StorageTierSizes 2.4TB, 41TB

Enclosure awareness

Enclosure awareness provides an extra layer of fault-tolerance by ensuring that data copies are spread

across the available enclosures, such that the loss of an entire enclosure still allows access to the data.

Enclosure awareness requires at least three storage enclosures.

Table 9. Enclosure configurations for failure coverage

Resiliency level Storage enclosure failure coverage

Two storage enclosures Three storage

enclosures

Four storage enclosures

Two-way mirror 1 disk 1 enclosure 1 enclosure

Three-way mirror 2 disks 1 enclosure + 1 disk 1 enclosure + 1 disk

Parity 1 disk 1 disk 1 disk

Dual parity 2 disks 2 disks 1 enclosure + 1 disk

Enclosure awareness is configured when you create a VD.

Run the following PowerShell command for enabling enclosure awareness.

New-VirtualDisk -FriendlyName <vdName> -StoragePoolFriendlyName <poolName> -

IsEnclosureAware <$true|$false> -ProvisioningType Fixed -ResiliencySettingName

<Simple| Mirror| Parity> -PhysicalDiskRedundancy <1|2> -StorageTiers

<ssdTierObject, hddTierObject> -StorageTierSizes <ssdTierSize , hddTierSize>

For example,

A new VD is created with the name exampleVD3 in storage pool MyPool1. This VD uses enclosure

awareness so the IsEnclosureAware attribute is set to $true.

New-VirtualDisk -FriendlyName exampleVD3 -StoragePoolFriendlyName MyPool1 -

IsEnclosureAware $true -ProvisioningType Fixed -ResiliencySettingName Mirror -