Dell 32XX, 34XX, 38XX, 36XX manual Create Consistency Group Snapshot Image

An operation on a snapshot image consistency group is treated as a single request, and causes all pending I/O operations to the associated base virtual disk of each member to be drained and suspended before creating the snapshot images. If creation of the snapshot images cannot be completed successfully for all of the consistency group members, the operation fails and has no affect (that is, new snapshot images are not created).

Based on this behavior all members for a consistency group usually have the same number of PiTs. However, when a new member is added to a consistency group, that new member lacks the snapshot images that were previously created on the established members of the consistency group. This is not considered an error condition. Ensuing requests for deletion or rollback of snapshot images that only exist on a subset of the consistency group members will only affect the members for which the specified snapshot images actually exists.

For more information on scheduling snapshot images in a consistency group, see Scheduling Snapshots.

Create Consistency Group Snapshot Image

Description

This command creates a new snapshot image for each base virtual disk that is a member of a snapshot consistency group.

Syntax

create cgSnapImage consistencyGroup="consistencyGroupName"

Parameter

Parameter	Description
consistencyGroup	The name of the consistency group for which you
	are creating snapshot images. Enclose the
	consistency group name in double quotation
	marks (" ").

Notes

You can use any combination of alphanumeric characters, hyphens, and underscores for the names. Names can have a maximum of 30 characters.

The command causes all pending I/O operations to each base virtual disk that is a member of the consistency group to be drained and suspended before creating the snapshot images. If the creation of all of the snapshot images cannot be completed successfully for all of the consistency group members, the operation fails and new snapshot images are not created.

Normally, all members of a snapshot consistency group will have the same number of snapshot images. When you add a new member to a snapshot consistency group, that new member lacks the snapshot images that were previously created on the established members of the snapshot consistency group. This is not an error condition. Requests for deletion or rollback of snapshot images that exist on only a subset of the snapshot consistency group members affects only those members for which the specified snapshot image actually exists.

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