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MK-97DF8018-00 manual
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viii
Preface
Hitachi Simple Modular Storage Copy
-on-Write SnapShot User’s Guide
Contents
Main
MK-97DF8018-00
Hitachi Simple Modular Storage Copy-on- Write SnapShot Users Guide
ii
Preface
iv
Document Revision Level
Safety and Warnings
Intended Audience
Product Version
Release Notes
Document Organization
Referenced Documents
vi
Document Conventions
Convention for Storage Capacity Values
Getting Help
Support Contact Information
Comments
Page
Table of Contents
1 SnapShot Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2 Planning and Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
4 Enabling and Disabling SnapShot. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
5 Configuring SnapShot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Page
Page
SnapShot Overview
12
Copy-on-Write SnapShot Software
Hardware and Software Configuration
Figure 1-1: SnapShot functional components
How SnapShot Works
14
Volume PairsP-VOLs and V-VOLs
Page
16
Data Pools
Differential Management LUs (DM-LU)
Consistency Group (CTG)
SnapShot InterfaceStorage Navigator Modular 2
Planning and Design
22
The Plan and Design Workflow
Assessing Business Needs
Establishing How Often a Copy Is Made (Copy Frequency)
Selecting a Reasonable Time Between Snapshots
Establishing How Long a Copy Is Held (Copy Lifespan)
Lifespan Based on Backup Requirements
24
Lifespan Based on Business Uses
Figure 2-1: V-VOL Frequency, Lifespan
Establishing the Number of V-VOLs that Are Required
Establishing Data Pool Size
Figure 2-2: Write workload and data pool size
Measuring Workload Data
26
Figure 2-3: Raw Data Example in MB/sec
Figure 2-4: Rolling Averages Calculated Using V-VOL Frequency
Figure 2-5: Rolling Averages Graphed Over Raw Averages
28
Rule of Thumb Calculation
Table 2-1: Workload Rates when No Measurement
Data Pool Key Points
Calculating Maximum Capacity
210
Operating System Considerations
Identifying P-VOL and V-VOL
Cluster Software, Path Switching Software
Microsoft Cluster Server (MSCS)
Veritas Volume Manager (VxVM)
Windows 2000
Windows Server 2003
Linux and LVM Configuration
Windows Server 2003/Windows 2000 and Dynamic Disk
Page
Page
Requirements
32
System Requirements
Supported Platforms
Table 3-2 shows the supported platforms and operating system versions required for SnapShot.
Table 3-1: Storage S
Minimum Requirements
Page
42
Enabling/Disabling SnapShot
Page
Page
Configuring SnapShot
52
Configuration Workflow
Assign Volumes for the Data Pool
Notes on Adding a Data Pool
Set Up the Virtual Volume (V-VOL) (manual method)
Page
Using SnapShot
62
SnapShot Replication Workflow
Back Up Your VolumeCreate a Pair
Using the Backup Wizard
Create Pair Procedure
64
Update the V-VOL
Restore the P-VOL from the V-VOL
Restore from Tape
66
Use the V-VOL for Tape Backup, Testing, Reports, Etc.
Edit Pairs, Data Pool
Delete Pairs, V-VOLs, Data Pools
68
Test the Configuration
Monitoring and Maintenance
72
Monitoring SnapShot
Monitoring Pair Status
Table 7-1: Pair Statuses
Monitoring Data Pool Usage
Expanding the Data Pool
Other Methods for Lowering Data Pool Load
Page
Troubleshooting
82
Pair Failure
Recovering from Pair Failure Due to POOL FULL
Recovering from Pair Failure Due to a Hardware Failure
Page
Page
A
Operations Using CLI
A2
Enabling and Disabling SnapShot
Operations for SnapShot Configuration
Setting the POOL
A4
Setting the V-VOL
Performing SnapShot CLI Operations
Creating SnapShot Pairs
A6
Updating SnapShot Logical Unit
Restoring V-VOL to P-VOL
Releasing SnapShot Pairs
A8
Changing Pair Information
Creating Pairs that Belong to a Group
Operations Using CLI A9
Sample Back Up Script for Windows
This section provides sample script for backing a volume on Windows.
Page
Page
B2
General Specifications
Table B-1 lists external specifications for SnapShot.
Table B-1: General Specifications
Item Specification
Maximum Capacity on page 2-9
Table B-1: General Specifications
Item Specification
Page
Glossary1
Glossary
Glossary2
A
B
C
Glossary3
Glossary4
Glossary5
D
Glossary6
E
F
Glossary7
G
I
Glossary8
L
Glossary9
M
P
Glossary10
Glossary11
R
Glossary12
S
Glossary13
T
V
W
Glossary14
Index-1
Index
A
B
C
D
Index-2
O
P
R
S
Page
MK-97DF8018-00