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Chapter 8: Advanced Volume Operations 147
10255
Snapshot1
QA Testing
MM
AO
AS
NH
AN
SS
UN
PT
Snapshot1
S
QA Testing
MM
AO
AS
NH
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B S
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Figure 78. Update to 1
st
Snapshot & 1
st
Write to Source
Figure 79, page 148 shows the creation of a second snapshot and a second
write operation to the source volume. The original data, N, A and P, from
sectors 5, 9 and 13 are first copied to the Snapshot 1 & 2 and then the new
data, B, E and B, are written to the source volume.
Because snapshot volumes are independent of each other, the original data
must be written to each relevant snapshot, as in Snapshot 1 and 2. The
pointer table is only between a single snapshot and its source; never to parts
of other snapshots. Therefore, if one snapshot volume fails, no other
snapshot is affected.
volume create snapshot –vol Snapshot2 –src QATesting –ch
Snapshot2 -lt 80