Field

Description

Number of Virtual Volumes

The number of virtual volumes selected.

Enable Resize

Select this option to allow logical resizing for the selected virtual  volumes. Not valid for Mapstore, Snapshot, or mapped virtual volumes.

Logical size is the size of the LUN  that application servers discover when the virtual volume is mapped.

Maximum Size is the size of the smallest volume comprising the selected virtual volumes. This is the maximum logical size allowed.

Write Through Mode

When enabled, all writes sent to the virtual volume will no longer use cache on the storage server and are sent directly to storage. Although performance may be affected, this feature is recommended for AIM destination virtual volumes.

Secondary is Preferred Path

This option only applies to virtual volumes being mapped to application servers using DataCore Alternate Pathing and DataCore MPIO products. By default, the preferred path to use is the path to the primary volume. Enable this option to use the path to the secondary volume as the preferred path.

Replace Volume on Failure

Select this option to flag all volumes within a virtual volume for replacement by a hot spare in the event that any of the volumes fail.  When a failure occurs, the bad volume is automatically swapped with a previously created hot spare. This feature is unavailable for linear virtual volumes.

Refer to Configuring Hot Spare Replacements for more information.

Persistent Reserve

When enabled, the virtual volumes can support the SCSI-3 Persistent Reserve commands. Automatically enabled and locked when the Asymmetric Logical Unit Access (ALUA) is enabled.

Note: Enable the option before mapping the virtual volumes. Persistent Reserve cannot be enabled after the virtual volumes are mapped.

Asymmetric Logical Unit Access

When checked, enables support of SCSI-3 target port group commands (ALUA).  

Note: Enable the option before mapping the virtual volumes. ALUA cannot be enabled after the virtual volumes are mapped.

Mirroring

Path Options

Selections provide the type of mirror mappings to create.

Alternate Path (AP)

Select this option when mapping to application servers running DataCore Alternate Pathing.

Bootable - Select this option when the virtual volume is to be used for booting from the SAN.

Manual Failback - Select this option when you do not want the application server to automatically failback to the preferred path. Once healthy, the path can be switched back manually via the Failback to Primary Path feature, available from the virtual volume context menu in SANcentral Status tab.

 3rd Party AP / MPIO (3PAP)

Select this option when mapping to application servers running DataCore MPIO or a third party multipathing software.

Cluster Path  / Manual Mappings (CP)

Select this option when mapping to Windows servers running Microsoft Clusters that only have a single Fibre Channel or iSCSI connection are not using the options for DataCore Alternate Pathing or DataCore MPIO.

Standard

Select this option when application servers only have direct access to the primary storage server (no direct access to the secondary server). For this mirror type, data is transferred to the primary, and then mirrored to the secondary. Standard mirrors can be split while mapped, refer to Splitting a Mirror.

Recovery Priority

This option allows you to designate mirror recovery. According to importance, select the recovery priority— from 0 (low) to 3 (high). The default is 0. Refer to Setting Mirror Recovery Priority.