11 
VNX SAN Copy 
A Detailed Review  
SAN Copy full and incremental sessions 
SAN Copy supports the incremental update of destination LUNs with only the data 
that has changed on the source since the last update. This gives SAN Copy users a 
choice of two session types: full and incremental.  
A full session copies the entire contents of the source LUN to the destination 
LUN(s) every time the session is executed. Full sessions can be a push or a pull 
with any qualified storage system. Users usually use a full SAN Copy session for 
migrating data to and from a VNX storage system. 
An incremental session requires a full copy only once. This is called an initial 
synchronization. After the initial synchronization, each incremental update copies 
only the data that has changed on the source LUN since the beginning of the last 
update. For incremental sessions the source LUN must reside on the SAN Copy 
storage system, but the destination LUN can reside on any qualified system. Users 
usually use incremental sessions for ongoing backups, such as daily sales 
updates. To configure incremental sessions, LUNs need to be added to the 
reserved pool. 
Source LUN requirements 
When creating a full session, data is copied directly from the source; therefore, in 
order to create a consistent copy of the data, I/O must be quiesced on the source for 
the duration of the session. To allow the production LUN to be active during the SAN 
Copy transfer, a full session may be created using a SnapView snapshot or a fractured 
clone as the data source. 
With incremental sessions, it is not necessary to keep the host I/O quiesced during 
the entire session. Before a transfer, host buffers should be flushed, and I/O should 
be momentarily quiesced. On Windows, when you manually control SAN Copy session 
updates with Unisphere, you can use admhost to quiesce the host and flush the 
buffers. Alternatively, if you use Replication Manager to manage the SAN Copy 
session, Replication Manager will work with server applications to facilitate 
application-consistent copies. 
Destination LUN requirements 
A destination LUN of an incremental session should not be immediately mounted by a 
host. SAN Copy does not track changes on the destination LUN. For example, if a 
destination LUN is mounted and changed due to host I/O, SAN Copy will not be aware 
of these changes. When the destination LUN is modified, a full synchronization from 
source to destination is required to bring the destination to a consistent, known 
state. 
One of the following methods can be used to access the data on a destination LUN: 
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VNX SAN Copy 
A Detailed Review  
control software platform:VB.NET PowerPoint: Use PowerPoint SDK to Create, Load and Save PPT
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VNX SAN Copy 
A Detailed Review  
control software platform:C# Create PDF from OpenOffice to convert odt, odp files to PDF in
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VNX SAN Copy 
A Detailed Review  
control software platform:VB.NET PowerPoint: Merge and Split PowerPoint Document(s) with PPT
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VNX SAN Copy 
A Detailed Review  
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16 
VNX SAN Copy 
A Detailed Review  
17 
VNX SAN Copy 
A Detailed Review  
18 
VNX SAN Copy 
A Detailed Review  
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VNX SAN Copy 
A Detailed Review  
20 
VNX SAN Copy 
A Detailed Review  
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