V-Trees; Snapshot Operations - Dell EMC VxFlex Ready Node User Manual
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Architecture
V-Trees
Dell EMC VxFlex Ready Node AMS User Guide
62
Figure 10 Snapshot operations
The structure related to all the snapshots resulting from one volume is referred to as a
V-Tree (short for volume tree). When taking a snapshot in the system, you can
specify more than one volume. All snapshots taken together form a consistency group.
They are consistent in the sense that they were all taken at the same time. So if there
is a contextual relationship between the data contained by all the snapshot members,
then that set is meaningful. The consistency group allows manipulation of the entire
set.
If you remove an entire consistency group, all of the snapshots that were taken
together will be removed. In RED, S211 is a snapshot of V2. Since S112 and S211 were
taken together, they compose a consistency group designated as C1.
Note:
The consistency group is only for convenience purposes. There are no
protection measures done by VxFlex OS to conserve the consistency group. For
example, you can remove a snapshot that is a member of a consistency group.
Note:
Support of removal of a parent snapshot in the system. You can merge the
parent to a child snapshot.
Note:
It is recommended not to trim volumes that contain snapshots as the logical
capacity may not shrink.
A V-Tree consists of the root volume ans all its descendant volumes and snapshots.
A V-Tree (short for volume tree) is the structure comprised of a volume and the
snapshots resulting from that volume. It is a tree spanning from the source volume at
its root, whose descendants are either snapshots of the volume itself or snapshots of
a snapshot. In the V-Tree diagram, S
of snapshot S
. Together, V
111
and S
are snapshots of V
111
112
and S
are the V-Tree of V
1
1xy
. S
is a snapshot
1
121
.
1
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