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Dell PowerVault MD3200i User Manual

Dell PowerVault MD3200i
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168 Configuration: Premium Feature—Snapshot Virtual Disks
The associated snapshot repository virtual disk must have sufficient capacity
to process the rollback operation and the write operations from the host. At
most, the snapshot repository virtual disk may need twice the size of the base
disk, plus additional metadata space equaling approximately 1/1000th (that
is, 0.1%) of the Base volume capacity.
NOTE: Due to host server write operations, the content in the snapshot virtual disk
may have changed since creation of the snapshot. The rollback operation includes
any changes made to the snapshot after it was created.
You can set priority for a rollback operation. Higher priority allocates more
system resources for the rollback operation and affects overall system
performance.
Rules and Guidelines for Performing a Snapshot Rollback
The following rules and guidelines apply to performing a snapshot rollback:
Rolling back a base virtual disk to a snapshot virtual disk does not affect
the contents of the snapshot virtual disks.
Only one snapshot rollback operation can be performed at a time.
While a base virtual disk that is undergoing a rollback, you cannot create a
new snapshot virtual disks from that base virtual disk.
A snapshot rollback cannot be started while any of these operations are
underway:
Virtual Disk Capacity Expansion
Virtual Disk Expansion (VDE)
RAID Level Migration
Segment Size Migration
–Virtual Disk Copy
Role Reversal (in remote replication)
If the base virtual disk is a secondary virtual disk in a remote replication,
you cannot perform a snapshot rollback.
If any capacity used in the associated snapshot repository virtual disk
contains unreadable sectors, the snapshot rollback fails.
book.book Page 168 Saturday, September 24, 2011 9:06 AM

Table of Contents

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Dell PowerVault MD3200i Specifications

General IconGeneral
HDD speed15000 RPM
RAID levels0, 1, 5, 6, 10
Storage drive capacity600 GB
Storage drive interfaceSerial Attached SCSI (SAS)
Maximum supported storage capacity115.2 TB
Number of storage drives installed12
InterfaceRJ-45, SAS, PS/2
Connector(s)4x RJ-45, 1x 6Gb SAS, 1x PS/2
Power supply typeAC
Dimensions (WxDxH)446.3 x 561 x 86.8 mm
Power requirements90 - 264 V, 47 - 63 Hz
Networking featuresGigabit Ethernet
Compatible operating systemsWindows, Linux, VMware, Hyper-V
InternalNo
LED indicatorsHDD, Power, Power fail, Status
Operating temperature (T-T)10 - 35 °C
Operating relative humidity (H-H)20 - 80 %
Power consumption (typical)25 W
Power supply unit (PSU) capacity600 W
Weight and Dimensions IconWeight and Dimensions
Weight29300 g

Summary

Planning: Understanding Your Storage Array

Hardware Features Overview

Details the physical components and indicators of the storage array.

Front-Panel Features and Indicators

Describes front panel features and LED indicators on the array.

Back Panel Features and Indicators

Describes back panel features and indicators on the array.

Hard-Drive Indicator Patterns

Explains the meaning of hard drive LED indicator patterns.

Power Indicator Codes and Features

Describes power indicator codes and features of the array.

Planning: RAID Controller Modules

RAID Controller Modules Overview

Explains the function and features of RAID controller modules.

RAID Controller Module Connectors and Features

Details the connectors and features of the RAID controller module.

RAID Controller Module Additional Features

Covers additional features like battery backup and thermal shutdown.

Planning: Storage Array Terms and Concepts

Core Storage Concepts: Disks and Groups

Defines physical disks, virtual disks, and disk groups.

Physical Disks and States

Explains physical disks and their recognized states.

Virtual Disk States and RAID Levels

Lists virtual disk states and explains RAID levels and usage.

RAID Level Usage Guidance

Guides on selecting optimal RAID levels based on requirements.

Virtual Disk Operations Overview

Outlines operations like initialization, consistency checks, and media verification.

Disk Group Operations

Details operations like RAID Level Migration and Disk Group Expansion.

Host-to-Virtual Disk Mapping and Types

Explains host mapping to virtual disks and host attributes.

Configuration: Overview of Storage Manager

Configuration: About Your Storage Array

Configuration: Using iSCSI

iSCSI Target Authentication and Secrets

Explains iSCSI target authentication (None/CHAP) and creating CHAP secrets.

Configuring iSCSI Host Ports

Guides on configuring iSCSI host ports for IPv4 and IPv6.

Configuration: About Your Host

Configuring Host Access

Explains how to configure host access to the storage array.

Mappings Tab and Defining Hosts

Describes using the Mappings tab and defining hosts.

Configuration: Disk Groups and Virtual Disks

Creating Disk Groups and Virtual Disks

Guides on creating disk groups and virtual disks.

Disk Group Creation and Location

Explains how to create and locate disk groups.

Virtual Disk Creation and Modification

Provides guidelines for creating and modifying virtual disks.

Physical Disk Security

Explains SED technology, creating, changing, and saving security keys.

Host-to-Virtual Disk Mapping

Guides on mapping virtual disks to hosts and host groups.

Configuration: Premium Feature—Snapshot Virtual Disks

Snapshot Virtual Disks Overview

Describes snapshot virtual disks as point-in-time images.

Scheduling Snapshot Virtual Disks

Explains how to schedule snapshot creation with common reasons and guidelines.

Creating Snapshots: Simple Path

Guides on creating snapshots using the simple path.

Creating Snapshots: Advanced Path

Guides on creating snapshots using the advanced path.

Snapshot Rollback Operations

Describes reverting virtual disk contents to a previous snapshot.

Configuration: Premium Feature—Virtual Disk Copy

Creating a Virtual Disk Copy

Guides on the process of creating a virtual disk copy.

Configuration: Upgrading to High-Performance-Tier

High-Performance Tier Upgrade Process

Enables the high-performance-tier premium feature using MDSM software.

Configuration: Device Mapper Multipath for Linux

Device Mapper Configuration Steps

Outlines the steps for DM multipathing configuration.

Management: Firmware Downloads

Downloading RAID Controller and NVSRAM Packages

Guides on downloading firmware packages.

Downloading Controller and NVSRAM Firmware

Explains downloading both RAID controller and NVSRAM firmware.

Management: Installing Array Components

Hard Drive Installation and Removal

Discusses hard drives, blanks, and their installation/removal.

RAID Controller Module Management

Discusses RAID controller modules and their installation/removal.

Troubleshooting: Your Storage Array Software

Recovery Guru and Array Profile

Describes using Recovery Guru and viewing the storage array profile.

Unresponsive Array Recovery Procedures

Guides on recovering from unresponsive storage arrays.

Troubleshooting: Your Array

Safety First and Startup Failure Troubleshooting

Safety precautions and troubleshooting storage array startup failures.

RAID Controller Module Troubleshooting

Covers troubleshooting RAID controller modules.

Troubleshooting Hard Drives

Guides on troubleshooting hard drive issues.

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