Dell PS4100 Technical Information download pdf (Page 33)

June 2012 Dell EqualLogic Configuration Guide v13.2 27

• Snapshots of volumes with a high data change rate will require a larger snapshot reserve space.

• Snapshots have access control lists that are inherited from the parent volume by default.

• Snapshot reserve space for any volume can be decreased at any time. The minimum size

allowed will be based on the current space usage consumed by existing snapshots using the

snapshot reserve.

• Snapshot reserved space for any volume can be increased at any time assuming there is

available free space in the storage pool hosting the volume.

3.6 Clones

Cloning creates a new volume by copying an existing volume. The new volume has the same

reported size, contents and thin-provision settings as the original volume. You can clone a regular

volume, a specific replica of a volume, or a specific snapshot of a volume.

• Volume clones use non-shared storage (unlike snapshots)

• Volume clones reduce the amount of storage pool free space

• All regular volume operations can be performed on the clone once the cloning operation is

complete.

• The cloning operation supports instant accessibility (while the clone operation is occurring)

Table 12 shows clone sources and properties.

Table 12 Cloning Modes and Properties

Clone Source Common Properties

Clone from Volume

• Creates a new volume

• Creates a new volume name

• Creates a new iSCSI target IQN

• Has same reported size as source volume

• Has same contents as source volume

• Cloned volume is immediately available

• Cloning consumes free pool space equivalent to

100% of the volume reserve setting for the source

volume

(a)

Clone from

Snapshot

Clone from

Inbound Replica

(a)

(secondary group)

(a)

Replica clones are created in the secondary group pool and are immediately available at the

secondary group IP address.

3.7 Template volumes and thin clones

Template volumes and thin clones are new PS Series features introduced with firmware version 5.0.

Thin clones are created from template volumes. With a few exceptions, all normal volume operations

apply to template volumes and thin clones. For details on using template volumes and thin clones, see

the

Advanced volume operations  About template volumes and thin clones

section of the

Series Group Manager

documentation.

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