Overland Storage SnapSAN S5000 User manual

Overland
Storage SnapSAN™Data Migration
User Guide
S5000
May 2013
10400414-002

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SnapSAN Data Migration User Guide
©2013 Overland Storage, Inc. All rights reserved.
Overland®, Overland Data®, Overland Storage®, ARCvault®, DynamicRAID®, GuardianOS® (EU), LibraryPro®, LoaderXpress®, Multi-
SitePAC®, NEO®, NEO Series®, PowerLoader®, Protection OS®, REO®, REO 4000®, REO Series®, Snap Appliance®, Snap Care® (EU),
SnapSAN®, SnapServer®, StorAssure®, Ultamus®, VR2®, and XchangeNOW® are registered trademarks of Overland Storage, Inc.
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SnapScale X2™, SnapServer DX Series™, SnapServer Manager™, and SnapWrite™ are trademarks of Overland Storage, Inc.
All other brand names or trademarks are the property of their respective owners.
The names of companies and individuals used in examples are fictitious and intended to illustrate the use of the software. Any resemblance to
actual companies or individuals, whether past or present, is coincidental.
PROPRIETARY NOTICE
All information contained in or disclosed by this document is considered proprietary by Overland Storage. By accepting this material the recipient
agrees that this material and the information contained therein are held in confidence and in trust and will not be used, reproduced in whole or in
part, nor its contents revealed to others, except to meet the purpose for which it was delivered. It is understood that no right is conveyed to
reproduce or have reproduced any item herein disclosed without express permission from Overland Storage.
Overland Storage provides this manual as is, without warranty of any kind, either expressed or implied, including, but not limited to, the implied
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programs described in this manual at any time. These changes will be incorporated in new editions of this publication.
Overland Storage assumes no responsibility for the accuracy, completeness, sufficiency, or usefulness of this manual, nor for any problem that
might arise from the use of the information in this manual.

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Preface
This user guide explains how to use the Data Migration function. Data migration is a
function to copy the data on a logical volume of the source disk array onto a logical disk
of the destination disk array without change. This guide assumes that you are familiar
with computer hardware, data storage, and network administration terminology and
tasks. It also assumes you have basic knowledge of Internet SCSI (iSCSI), Serial-
attached SCSI (SAS), Serial ATA (SATA), Storage Area Network (SAN), and
Redundant Array of Independent Disks (RAID) technology.
This guide assumes that you are familiar with computer hardware, data storage, and
network administration terminology and tasks. It also assumes you have basic
knowledge of Internet SCSI (iSCSI), Serial-attached SCSI (SAS), Serial ATA (SATA),
Storage Area Network (SAN), and Redundant Array of Independent Disks (RAID)
technology.
Product Documentation and Firmware Updates
Overland Storage [prod_name] product documentation and additional literature are
available online, along with the latest release of the [prod_name] nn software.
Point your browser to:
http: //docs.overlandstorage.com/snapsan
Follow the appropriate link to download the latest software file or document. For
additional assistance, search at http: //support.overlandstorage.com.
Overland Technical Support
For help configuring and using your [prod_name] nn, search for help at:
http: //support.overlandstorage.com/kb
You can email our technical support staff at [e-mail] or get
additional technical support information on the Contact Us web page:
http: //www.overlandstorage.com/company/contact-us/
For a complete list of support times depending on the type of coverage, visit our web
site at:
http: //support.overlandstorage.com/support/overland_care.html

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SnapSAN S5000 Data Migration User Guide
Conventions
This user guide exercises several typographical conventions:
Information contained in this guide has been reviewed for accuracy, but not for product
warranty because of the various environments, operating systems, or settings involved.
Information and specifications may change without notice.
Convention Description & Usage
Boldface Words in a boldface font (Example) indicate items to select such as
menu items or command buttons.
Ctrl-Alt-r This type of format details the keys you press simultaneously. In this
example, hold down the Ctrl and Alt keys and press the rkey.
NOTE A Note indicates neutral or positive information that emphasizes or
supplements important points of the main text. A note supplies
information that may apply only in special cases—for example,
memory limitations or details that apply to specific program versions.
IMPORTANT An Important note is a type of note that provides information
essential to the completion of a task or that can impact the product
and its function.
CAUTION A Caution contains information that the user needs to know to avoid
damaging or permanently deleting data or causing physical damage
to the hardware or system.
WARNING A Warning contains information concerning personal safety. Failure
to follow directions in the warning could result in bodily harm or
death.
Menu Flow
Indicator
(>)
Words in bold font with a greater than sign between them indicate
the flow of actions to accomplish a task. For example, Setup >
Passwords > User indicates that you should press the Setup button,
then the Passwords button, and finally the User button to accomplish
a task.

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Contents
Preface
Chapter 1 - Data Migration
Overview ..................................................................................................................................................... 1-1
Features ................................................................................................................................................. 1-1
Migration Patterns ........................................................................................................................... 1-2
Chapter 2 - Function
Source and Destination Disk Arrays .......................................................................................................... 2-1
Disk Array Connection Configuration ................................................................................................ 2-1
Data Migration Methods ..................................................................................................................... 2-2
Data Migration States and State Transition ....................................................................................... 2-3
Data Migration States ..................................................................................................................... 2-4
Chapter 3 - System Configuration
System Configuration ................................................................................................................................. 3-1
Hardware Configuration ...................................................................................................................... 3-1
Software Configuration ........................................................................................................................ 3-1
Phases .............................................................................................................................................. 3-2
Preparation for Data Migration ........................................................................................................... 3-2
Details of Pre-Migration Processing .................................................................................................... 3-3
Failed Data Migration ..................................................................................................................... 3-5
FC Connection ................................................................................................................................ 3-5
Migration Processing Stopping the Server ............................................................................................... 3-8
Unmount the logical disk. ............................................................................................................ 3-10
Migration Processing Stopping Operations ........................................................................................... 3-17
Migration Processing Stopping Operations ........................................................................................... 3-26
Post-Migration Processing ........................................................................................................................ 3-29
Rollback Procedure ................................................................................................................................. 3-30
Chapter 4 - Commands
Command List ............................................................................................................................................. 4-1
Volume Types ........................................................................................................................................ 4-1
Data Migration Operation File ............................................................................................................ 4-2
Listing Information about Logical Disks and Disk Arrays Used for Data Migration ................... 4-2
Main Options ................................................................................................................................... 4-2
Displaying the Status of Data Migration ........................................................................................... 4-3
Starting Data Migration .................................................................................................................. 4-7
Suspending Data Migration ........................................................................................................... 4-8
Restarting Data Migration .............................................................................................................. 4-9

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Appendix A - Notes
Appendix B - Licenses
Apache License ......................................................................................................................................... B-1
Flex License ................................................................................................................................................. B-1
OpenSSL License ......................................................................................................................................... B-1
Index

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Chapter 1
Data Migration
Overview
Data migration is a function to copy the data on a logical volume of the source disk array
onto a logical disk of the destination disk array without change. This function is installed on
the destination disk array. You can operate data migration by running commands for data
migration on the destination disk array.
To replace an existing disk array with a new disk array, you must migrate the data
accumulated on the existing disk array to the new disk array. Previously, for data migration,
it was necessary to examine means of migrating data in individual cases. To address this, a
new function is provided to facilitate data migration from an existing disk array to a new
disk array.
Features
The data migration function has the following features:
•Since this function is incorporated in the disk array, it is no longer necessary to copy
data on the server for data migration.
•Data can be migrated faster than the conventional data migration method using the
tape and LAN.
•Data can be migrated from the disk array without the remote Volume Cloning function
or purchased license.
•Data can be migrated even if the source logical disk and the destination logical disk
have different capacities (However, the capacity of the destination logical disk must be
equal to or larger than that of the source logical disk capacity).

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Figure 1-1: Reduction in Migration Time Realized with the Data Migration Function
In data migration, data is acquired from a logical disk of the source disk array and copied
onto a logical disk of the destination disk array by executing the data migration function on
the destination disk array.Input/output to/from the source logical disk must be completely
stopped during data migration. Select whether to migrate data stopping operations without
stopping the server or to migrate data stopping the server, depending on the configuration of
existing disk array connection or the configuration of migration target device.
Migration Patterns
Migration patterns for which the data migration function can be used are shown below.
1. When migrating the disk array only from the environment where the application
server and the source disk array are connected directly through FC.

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2. When migrating the disk array only from the environment where the application
server and the source disk array are connected via the FC switch.
3. When migrating the disk array and the application server from the environment
where the application server and the source disk array are connected directly through
FC.
4. When migrating the disk array and the application server from the environment
where the application server and the source disk array are connected via the FC
switch.

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5. When migrating the disk array, the application server, and the FC switch from the
environment where the application server and the source disk array are connected via
the FC switch.