EMC FC4700 Sample Snapshot Session

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EMC Fibre Channel Storage System Model FC4700 Configuration Planning Guide
About SnapView Snapshot Copy Software
Sample Snapshot Session
The following figure shows how a sample snapshot session starts,
runs, and stops.
Figure4-2 How a Snapshot Session Starts, Runs, and Stops
EMC1823
Production
Host Second Host
Source
LUN SnapshotSnapshot
cache
1.Before session starts
Source
LUN SnapshotCache
Production
Host Second
Host
2.At session start (2:00 p.m.)
Source
LUN SnapshotCache
Production
Host Second
Host
5.At session end (4:25 p.m.)
4.At end of operation (4:15 p.m.)
Production
Host Second Host
Source
LUN
Snapshot
(pointers to
chunks)
Cache
3.At start of operation (2:02 p.m.)
Production
host Second
host
Source
LUN Snapshot
(pointers to
chunks)
Cache
Changed chunks
on source LUN
Unchanged chunks in
cache and snapshot
Unchanged chunks
on source LUN
Key: