Sample Snapshot Session; How A Snapshot Session Starts, Runs, And Stops - EMC FC4700 Configuration Planning Manual

About SnapView Snapshot Copy Software
4

Sample Snapshot Session

1. Before session starts
Production
Host
Source
LUN
Key:
EMC Fibre Channel Storage System Model FC4700 Configuration Planning Guide
4-4
The following figure shows how a sample snapshot session starts,
runs, and stops.
2. At session start (2:00 p.m.)
Production
Second
Host
Host
Source
Snapshot Snapshot
LUN
cache
4. At end of operation (4:15 p.m.)
Production Second
Host Host
Source
Cache
LUN
Unchanged chunks
on source LUN
Changed chunks
on source LUN
Unchanged chunks in
cache and snapshot

How a Snapshot Session Starts, Runs, and Stops

Figure 4-2
3. At start of operation (2:02 p.m.)
Production
Second
host
Host
Cache Snapshot Source
LUN
5. At session end (4:25 p.m.)
Production
Host
Snapshot
(pointers to
chunks)
Source
LUN
Second
host
Cache Snapshot
(pointers to
chunks)
Second
Host
Cache Snapshot
EMC1823