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Snapshot Configuration Properties of the Dell EMC VNX / CLARiiON Storage Array

The Snap Configuration tab contains properties that affect the behavior of the storage array in your environment.

Property

Description

Use Consistency Group

Select this option to enable a consistency group, which reduces the time to verify the consistency of participating disks.

By default, this option is selected.

Tips:

  • To use the consistency group, you must also select the snapshot configuration property Enable VNX Snapshots.
  • After taking snapshots, avoid switching between enabling and disabling a consistency group. Switching might cause snapshots to enter the pending status, because a LUN can be part of only one consistency group. Instead of switching between enabling and disabling a consistency group, age the snapshot so that the array creates a new consistency group.

EMC SYMAPI Installation Home Directory Path

The directory where the EMC SYMAPI library is located.

Examples:

  • UNIX systems: opt/emc/SYMCLI/V6.5.1
  • Windows systems: C:\Program Files\EMC\SYMCLI

Remote Snap MA

The client name of the MediaAgent that you want to designate as the Remote Snap MediaAgent.

Enable VNX Snapshots

Select this option to enable VNX snapshots.

By default, this option is not selected.

Note: VNX snapshots are supported only for pool logical unit numbers (LUNs).

EMC Navisphere CLI Installation Home Directory Path

The directory where Navisphere CLI is located.

Important: This option is required for VNX snapshots.

Delete Restore Point Snapshot

Select this option to enable the deletion of Restore Point Snapshots after successful revert operations.

Revert from VNX snapshots automatically creates a “Restore Point Snapshot”, to recover from accidental data corruption.

By default, this option is not selected.

Sync operation retry count

The maximum number of times to attempt to synchronize a SYMAPI database.

By default, the value is 10.

Sync operation retry interval (in seconds)

The time interval (in seconds) after which the next SYMAPI database synchronization operation is executed. 

By default, the value is 5.

Maximum SnapView Sessions per LUN

The maximum number of SnapView sessions per LUN.

The limit is 8 sessions per LUN.

You can specify any value between 1 and 8.

Clone Sync Rate

The speed of the synchronization. The values that you can enter for the mode are as follows:

  • 1: Intelligent. In Intelligent mode, the first-time clone is created with a high synchronization rate. For incremental resynchronization, set the synchronization rate to Medium.
  • 2: Low.
  • 3: Medium (default value).
  • 4: High.

Tip: Follow the vendor's recommendation for the clone synchronization rate.

Enable physical delete of clone

Select this option to force the physical deletion of the clone during a delete operation.

This option disables incremental clone operations.

By default, during a delete operation, the clone is marked as aged and is not deleted. When a new clone request comes for the same LUN, the aged clone is selected for an incremental synchronization.

Use EMC API to detect host device paths

Select this option to enable the use of EMC APIs to detect Multipath I/O (MPIO) device paths.

By default, this option is not selected.

Powerpath Device cleanup retry count

The number of times to attempt the powerpath device cleanup.

By default, this value is 10.

EMC Powerpath Installation Home Directory

The path to the EMC powerpath installation directory.

If you don't enter a path, then the commands that are executed during snapshot operations or clone operations might fail.

Full sync during Rollback

Select this option to force the full synchronization of the SYMAPI database during a rollback.

By default, this option is not selected.

Mount Retry Interval (in seconds)

The time interval (in seconds) after which the next mount operation is attempted.

The default value is 300 (5 minutes).

Disable VNX Snapshot Auto-Delete

Select this option to disable the VNX Snapshot Auto-Delete policy at the snapshot level.

Last modified: 3/1/2019 2:02:29 AM