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.
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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

SnapSAN 5000 Data Migration User Guide
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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.

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Chapter 2
Function
Source and Destination Disk Arrays
This chapter describes the data migration function including the combinations of disk arrays
that are supported for data migration.
: Available for data migration -: Not available for data migration
*1: When an FC port is installed
* Data migration is supported only when the source and destination disk arrays are
connected by FC.
Disk Array Connection Configuration
The following disk array connection patterns are supported for data migration:
•Configuration in which the source and destination disk arrays are connected directly
to each other by FC
•Configuration in which the source and destination disk arrays are connected via an FC
switch
Destination Disk Array
Source Disk Array
FC Model iSCSI Model
FC Model -
iSCSI Model --
FC/iSCSI Model (mixed) *(1) -

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* In the above configurations, if the source disk array and destination disk array have
already been linked by the Remote Replication function, the source disk array will not be
subject for data migration.
Data Migration Methods
There are two types of data migration: migration on the per-operation basis and migration
during which the application server is stopped. Determine the migration method to use by
referring to the flowcharts shown below.
Data Migration Method Advantages Disadvantages
Data migration stopping
operations
Operations not using the logical
disk of which data is being
migrated can be continued.
Operation and data migration
may cause performance
degradation of each other.
Data migration stopping the
server
The steps are easier than data
migration stopping operations
and data can be more quickly
migrated.
Because the server is stopped,
all operations using the source
or destination disk array must
be stopped.

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Figure 2-1: Determination of Data Migration Method (FC Direct Connection Configuration)
Data Migration States and State Transition

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Data Migration States
* You can check the current data migration state by using the iSMmc_query command that
is used to show the copy state of the data migration pair.
Relationship between the data migration operations and pair status transition is shown.
Activity Data Migration
State
Description
Data migration
(Migrate)
Not-migrated A pair of source and destination logical disks has just been set.
Queued Waiting for the start of copying the data from the source logical
disk to the destination logical disk to be started.
Migrating The data is being copied from the source logical disk to the
destination logical disk.
Migrating(stop)
The instruction to stop copying the data is issued, and the
remaining data is being copied from the source logical disk to
the destination logical disk. The state will transit to Migrated
when copying all the data will be complete.
Migrated Copying the data from the source logical disk to the destination
logical disk is complete.
Suspended
Copying the data from the source logical disk to the destination
logical disk is suspended by the suspend instruction.
Copying the remaining data can be started by the restart
instruction.
Fault Copying the data from the source logical disk to the destination
logical disk is stopped due to a copy fault.
Cancelled Copying the data from the source logical disk to the destination
logical disk is stopped by the cancel instruction.

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Figure 2-2: Data Migration State Transition Diagram

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Chapter 3
System Configuration
System Configuration
Hardware Configuration
Select hardware components considering the operation mode, required performance
requirements and disk capacity. A configuration example of hardware components for using
the data migration function is shown below.
Figure 3-1: Hardware Configuration
Software Configuration
Select software to use considering the operating devices and the operation mode. A
configuration example of software components for using the data migration function is
shown below.

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Figure 3-2: Software Configuration
Phases
Execution of migration is divided into the following phases: pre-migration processing,
migration processing, and post-migration processing.
Pre-migration processing
Make preparations for data migration.
Migration processing
Migrate data and operations.
Usually, repeat migration until all the target logical disks are migrated.
Post-migration processing
Follow up data migration.
Preparation for Data Migration
This flow chart shows an overview of the pre-migration processing.

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Details of Pre-Migration Processing
1. Upgrade the SnapSAN Manager-related software to the latest version.
2. For server migration, install the latest version of SnapSAN Manager-related software
on the destination server.
•Application server and backup server
Storage Agent Utility or ControlCommand
PathManager
•Management server
SnapSAN Manager (when SnapSAN Manager Express is not used)
3. Unlock the licenses of DataMigration and required program products on the
destination disk array.
•BaseProduct (for disk array after SnapSAN S5000)
•AccessControl (for disk array after SnapSAN S5000)
•DataMigration
4. To perform data replication (Volume Cloning or Remote Replication) or snapshot
(Snapshots) operation on the destination disk array, unlock the license here.
•Volume Cloning
•Remote Replication
•Snapshots

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•Unlock the license by selecting [Bind] > [Disk array] > [Unlock license] from the main
window menu of SnapSAN Manager Embeded or SnapSAN Manager.
If you want to use a command for this operation, log in to the destination disk array
with the administrator privilege and execute the iSMcfg command.
iSMcfg command execution example:
# iSMcfg licenserelease -code <keycode>
iSM31001:[ licenserelease ]Please wait for a moment........
iSM31000:[ licenserelease ]Command has completed successfully.
ExitStatus:0
5. To create the system volume, navigate to [Bind] > [Logical disk] > [Bind logical disk (for
control)] and select [Data migration reserved volume] from the main window menu of
SnapSAN Manager Embeded or SnapSAN Manager.
•If you want to use a command for this operation, log in to the destination disk array
with the administrator privilege and execute the iSMcfg command.
In this example, a system volume is created under the logical disk number ffe
(hexadecimal) in pool No. 0 and the volume name Pool0000_MSV0FFE is set.
iSMcfg command execution example:
# iSMcfg ldbind -poolnumber 0 -ldn 0ffeh -ldattr msv
iSM31001:[ ldbind ]Please wait for a moment........
iSM31000:[ ldbind ]Command has completed successfully.
ExitStatus:0
#
# iSMcfg nickname -ldn 0ffeh -newname :Pooll0000_MSV0FFE
iSM31001:[ nickname ]Please wait for a moment........
iSM31000:[ nickname ]Command has completed successfully.
ExitStatus:0
6. Change the host port type of destination disk array to the data migration port and add
the initiator function. Having both the host port (target) attribute and the data
migration (initiator) attribute, the data migration port can be used for operation
input/output.
a. Display the host connection port setting screen by selecting [Bind]
> [Disk array] >
[Host connection port]
> [Port setting (FC)] from the main window menu of SnapSAN
Manager Embeded or SnapSAN Manager.
b. Select the port used for data migration from the port list displayed on the host
connection port setting screen and select the [Edit] button to display the edit
dialog.
c. Specify [Data migration port] as the port type on the edit dialog and select the [OK]
button.
d. Select the [Next] button, confirm the setting, and select the [Run] button.
e. Select [Yes] on the confirmation dialog.
f. When the completion screen is displayed, select the [Complete] button.
g. Display the host director properties screen to check that the host/data migration
port is set.
•If you want to use a command for this operation, log into the destination disk array
with the administrator privilege and execute the iSMcfg command.
In this example, the port with director number 0 and port number 1 is changed.

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iSMcfg command execution example:
# iSMcfg setporttype -portnumber 00h-01h -porttype hostdm
iSM31001:[ setporttype ]Please wait for a moment........
iSM31000:[ setporttype ]Command has completed successfully.
ExitStatus:0
Failed Data Migration
If rollback is necessary as a result of failed data migration, back up the configuration
information of source disk array (especially Access Control information) as follows:
1. Select [Bind]
> [View configuration] > [Configuration display screen] > [Acquire configuration
information] from the main window menu of SnapSAN Manager and save configuration
information in an arbitrary file.
2. Perform online backup on the source disk array through replication (Volume Cloning).
Be sure to create backup using backup software or other application if replication
backup operation is not used.
3. Create a logical disk to be the destination on the destination disk array. The capacity
of destination logical disk must be equal to or larger than that of the source logical
disk.
To perform the data replication or snapshot operation on the destination disk array
perform the following:
4. Specify the same [OS Type] as the source logical disk. The logical disk format indicates
the type of OS the uses the logical disk.
5. Assign a logical disk name corresponding to the source logical disk name so that that
you can easily see the relationship between the source and the destination logical disks
(for example, source_logical_disk_name_NEW).
•If you want to use a command for this operation, log in to the destination disk array
with the administrator privilege and execute the iSMcfg command.
In this example, the logical disk with logical disk number 300 (hexadecimal) and a
capacity of 100 GB is created in pool 0 and the logical disk name
EXP167_DATA_1_NEW is set.
iSMcfg command execution example:
# iSMcfg ldbind -poolnumber 0 -ldn 0300h -capacity 100 -unit gb
iSM31001:[ ldbind ]Please wait for a moment........
iSM31000:[ ldbind ]Command has completed successfully.
ExitStatus:0
# iSMcfg nickname -ldn 0300h -newname :EXP167_DATA_1_NEW
iSM31001:[ nickname ]Please wait for a moment........
iSM31000:[ nickname ]Command has completed successfully.
ExitStatus:0
NOTE: Do not set the Access Control setting to the application server or the replication function
pair or build the snapshot function here
FC Connection
6. Make FC connection at this time, if it is possible to add FC connection between the
source disk array and the destination disk array as well as between the application
server and the destination disk array (between the destination application server and
the destination disk array when migrating the server and between the existing server
and the destination disk array otherwise),