First Time Best Practices - Overland Storage SnapSAN S1000 User Manual

SnapSAN S1000 User Guide

First Time Best Practices

When executing a full copy replication job for the first time over a LAN or WAN, it may take
days or weeks to replicate all the data from the Source to the Target subsystem due to the
limited network bandwidth. The SnapSAN S1000 provides two features to help the user
shorten the execution time of a full copy.
• Skip a full copy to a new, clean virtual disk.
The term "clean" means that the virtual disk has never had data written to it since
being created.
For a newly created virtual disk which has never been accessed, the subsystem
recognizes that the disk is new and automatically skips the full-copy process when the
replication job is created on this virtual disk for the first time.
NOTE: Any IO access to the newly created virtual disk is marked as "not clean" by the
• Use Virtual Disk Clone.
NOTE: It is recommended that both the array/RAID group and the Virtual Disk that will be used
For a new replication job created on an existing virtual disk with stored data, a full
copy is necessary to synchronize the volume image between the Source and Target
virtual disks. It usually takes a long time to synchronize the data, especially when the
replication job is running over WAN with limited bandwidth.
A Virtual Disk Clone provides a faster first-time full-copy replication by first copying
the Source data between two virtual disks on two different physical disk drives. The
Target drive is then moved to the Target S1000.
The followings are the steps to use Virtual Disk Clone:
1. Create a cloning job on an existing virtual disk with data already stored.
2. Verify that no host is connected to the Source virtual disk, and run Virtual Disk
Clone.
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subsystem, even when executing the Erase function when a virtual disk is created. The
full copy process takes place in such a case.
are both idle during a Virtual Disk Clone.
©2010-13 Overland Storage, Inc.
First Time Best Practices
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