Dell Dr4000 restore manager How to use

Dell DR4000 System

Release 1.0

Release Notes

DR4000_RelNotes_book.book Page a Monday, January 23, 2012 12:13 PM

Notes, Cautions, and Warnings

NOTE: A NOTE indicates important information that helps you make better use of

your computer.

CAUTION: A CAUTION indicates potential damage to hardware or loss of data if

instructions are not followed.

WARNING: A WARNING indicates a potential for property damage, personal

____________________

Information in this publication is subject to change without notice.

Reproduction of these materials in any manner whatsoever without the written permission of Dell Inc.

is strictly forbidden.

Trademarks used in this text: Dell™, the DELL logo, and DR4000™ are trademarks of Dell Inc.

Microsoft®, Windows®, and Windows Server®are either trademarks or registered trademarks of

Microsoft Corporation in the United States and/or other countries. Symantec™ and Backup Exec™

are trademarks or registered trademarks of Symantec Corporation or its affiliates in the U.S. and other

countries.

Other trademarks and trade names may be used in this publication to refer to either the entities claiming

the marks and names or their products. Dell Inc. disclaims any proprietary interest in trademarks and

trade names other than its own.

2012 - 01 Rev. A00

DR4000_RelNotes_book.book Page b Monday, January 23, 2012 12:13 PM

DR4000 System Release Notes, Release 1.0 1

Overview: DR4000 System Release

Notes

The Release Notes for 1.0 are intended to supplement the Dell DR4000

system reference documentation available at support.dell.com/manuals. The

release notes contain important details about the system software, which is

pre-installed on Dell DR4000 systems, and documents the related known

issues, resolutions, and other important information needed for the 1.0

release of the DR4000 system.

Supported Software and Hardware

For a complete list of the supported hardware and software for the Dell

DR4000 system, see the Dell DR4000 System Interoperability Guide

available

support.dell.com/manuals

Source Code Availability

A portion of the DR4000 system software may contain or consist of open

source software, which you can use under the terms and conditions of the

specific license under which the open source software is distributed.

Under certain open source software licenses, you are also entitled to obtain

the corresponding source files. You may find the corresponding source files for

respective programs at http://opensource.dell.com.

Checking System Information

Before troubleshooting issues with any DR4000 system, ensure that the

installed DR4000 system software is up to date by checking its software

version against the available versions at support.dell.com/support/downloads.

For information about checking the current version of the DR4000 system

software installed, see "Verifying the Current Software Version" in Chapter 7

of the Dell DR4000 System Administrator Guide

available at

support.dell.com/manuals

DR4000_RelNotes_book.book Page 1 Monday, January 23, 2012 12:13 PM

2DR4000 System Release Notes, Release 1.0

Known Issues and Resolutions

This section explains the known issues, descriptions, status, and any

workaround for the DR4000 system software.

Table 1. Known Best Practices Issues and Workarounds for Release 1.0

Issue Description Workaround/Solution

4051

Recover,

restore, and

source-target

replication

issues.

Data loss can occur when a

DR4000 administrator does not

disable the replication relationship

between the source and target

containers before using the

DR4000 system command-line

interface (CLI) system --init

command on the source container.

CAUTION: The CLI system --init

command reconfigures the DR4000

system and removes all existing

data, and recreates the file system

to factory settings. Dell does not

recommend using this command on

systems containing production data

because it destroys any existing

data.

If you must use the CLI system --

init command, make sure that

you first disable the replication

relationship between the source

and target DR4000 systems.

CAUTION: Failure to observe this

practice may corrupt the data that

is stored on the replication target

system.

6381

Reduced

savings issues

encountered

when

compression-

enabled data

is ingested

from DMA

data sources.

The DR4000 system experiences

reduced savings rates (less than

optimal) when the data it ingests is

already compression-enabled by

the native data source.

It is recommended that you

disable the data compression

used by the data source for any

first-time backups. For optimal

savings, native data sources need

to send data in its raw state for

ingestion.

DR4000_RelNotes_book.book Page 2 Monday, January 23, 2012 12:13 PM

DR4000 System Release Notes, Release 1.0 3

8878

"Manual

Intervention

Required"

message

displayed.

The DR4000 system encountered

an issue during the calibration of

the super capacitor that caused the

"Manual Intervention Required"

system state message to display.

After this message displays, allow

the DR4000 system 15-30

minutes before attempting a cold

reboot of the system. The

DR4000 system should start up

with all services running

normally.

8897

DR4000 and

iDRAC

reboot

mismatch.

Currently, the DR4000 system can

encounter some low-level system

reboot management coordination

issues when the reboot is initiated

using iDRAC.

Initiate the reboot of the DR4000

system using either of the two

following choices:

• DR4000 system CLI command

(

system --reboot

)

• DR4000 system GUI command

(

System Configuration



Reboot

)

When the reboot is initiated using

system CLI or GUI commands,

the data contents are properly and

fully flushed to disk, before the

system is shut down. Failure to

follow this practice will cause the

DR4000 system to start filesystem

recovery during the boot process

(and lengthen the time required

for system reboot to complete).

Table 1. Known Best Practices Issues and Workarounds for Release 1.0

(continued)

Issue Description Workaround/Solution

DR4000_RelNotes_book.book Page 3 Monday, January 23, 2012 12:13 PM

4DR4000 System Release Notes, Release 1.0

8909

reinit_nvram

fails with:

NVRAM

’write ready’

time out

exceeded.

NVRAM reports errors and fails

memory tests when the proper

procedure for powering off the

DR4000 system and waiting for the

NVRAM to properly discharge is

not followed. Before attempting to

remove or replace the NVRAM in

the DR4000 system, you must

observe the steps documented in

"Shutting Down/Starting Up a

DR4000 System" in the Dell

DR4000 System Administrator

Guide.

Before attempting to remove or

replace the NVRAM in the

DR4000 system, observe the

following best practice for

shutting down the DR4000

system:

Power off the system using

either the DR4000 system

GUI (select

Shutdown

System Configuration

page,

or CLI (use the

system

--shutdown

command).

Allow the system to fully

complete its power-down

process (when the power

supply status indicator is

unlit).

Disconnect the system

power cables from the

electrical power outlet.

Ensure that you wait an

additional period of time

(up to 10 minutes) and/or

verify that all of the green

and amber NVRAM LEDs

on the rear panel of the

system chassis are unlit.

NOTE: If you do not allow the

NVRAM super capacitor sufficient

time to discharge, the NVRAM

status will report DATA LOSS when

the system is subsequently

powered on.

Table 1. Known Best Practices Issues and Workarounds for Release 1.0

(continued)

Issue Description Workaround/Solution

DR4000_RelNotes_book.book Page 4 Monday, January 23, 2012 12:13 PM

DR4000 System Release Notes, Release 1.0 5

Known Configuration Issues

Table 2. Known Configuration Issues and Workarounds for Release 1.x

Issue Description Workaround/Solution

425

Reverse

replication

not

supported on

DR4000.

Replica containers are always in a R-O

(read-only) mode on a DR4000

system and write operations are not

supported.

Under certain conditions, it might

be beneficial for replica containers

to support write operations for

restoring data from an archival

target.

For example, data could be

replicated back to the remote site

where the DMA is connected to

allow this data to be restored

directly.

This situation applies to

configurations where data is backed

up from a remote location to a local

container, and then replicated over a

WAN to a replica container that is

backed up to tape.

To leverage deduplication across

the WAN for this scenario:

Make sure that the

replication operation has

completed (between source

and target).

Delete current replication

relationship, and re-create

replication relationship

(reversing the source and

target roles).

Restore data to the original

target container (now the

source).

Make sure that the

replication operation has

completed.

Delete replication

relationship and re-create

replication relationship

(restoring original source

and target destinations).

Under this scenario, a fraction of

the data to be recovered is sent

across the WAN link. This could

speed up a remote restore

significantly.

DR4000_RelNotes_book.book Page 5 Monday, January 23, 2012 12:13 PM

6DR4000 System Release Notes, Release 1.0

425

Reverse

replication

not

supported on

DR4000.

(cont.)

The data needs to be restored from

the tape backup to the original

location (first back to the DR4000

replica container, and then back to

the original source location of the

data on the other side of the WAN

link).

NOTE: If you choose to use the

alternate workaround method, you

must set up a new data storage unit in

the DMA and import the images

before a restore to the original

location can occur.

However, there are some

downsides:

• If step 1 is not followed

correctly, any changes not fully

replicated are lost.

• During steps 2 and 3, any data

written to the original source

container may be lost.

• During step 4, if the data is

not fully replicated back before

the switch is made, it may be

lost.

Alternatively:

Create new container on

target DR4000.

Set up replication from this

container back to source

DR4000 container.

Set up a new disk storage

unit in DMA and make sure

that the DMA is aware of

new images.

Import old images back

into the DMA from target

DR4000 (the original

source location).

Use new disk storage unit in

DMA and restore data back

to the original client.

Table 2. Known Configuration Issues and Workarounds for Release 1.x

(continued)

Issue Description Workaround/Solution

DR4000_RelNotes_book.book Page 6 Monday, January 23, 2012 12:13 PM

DR4000 System Release Notes, Release 1.0 7

4256

NFS:

DR4000

returns an

incorrect

error message

to the client

for NFSv4 -

mount/UDP

(1.1).

The DR4000 system only supports

NFS Version 3 and TCP.

Some other operating systems (such

as Solaris and HP-UX) mount their

containers using the UDP protocol

and NFS using the TCP protocol.

However, these clients are not

supported by the DR4000 system.

There is no workaround or

solution (OS clients must

support NFS Version 3 and

TCP).

5601

Authenticati

on failure

when

entering in

username

and password

correctly.

The DR4000 system reports

authentication failure back to the

client if it cannot contact the domain

controller.

If the administrator is sure that

the username and password are

correctly entered, log into the

DR4000 CLI and enter the

following command:

network --ping

--destination <fully qualified

domain name of domain>

6957

system --init

failed with

"Failed to

unmount

/dev/sbd3".

This condition can occur when an

administrator has enabled

replications, there were active

snapshots, and the DR4000 CLI

commands were entered to reset the

system to its factory settings:

maintenance --filesystem --

wipe_data system --init

During the filesystem initialization,

the mkfs.vxfs are not properly

unmounting all the snapshots.

Use the Factory Reset option in

the Restore Manager (RM)

program, to reset the DR4000

system to its factory

configuration.

WARNING: The Factory Reset

mode deletes all DR4000

system data. Factory Reset

mode should only be used

when the data is no longer

needed.

NOTE: Contact Dell Support for

assistance prior to using the RM

program.

Table 2. Known Configuration Issues and Workarounds for Release 1.x

(continued)

Issue Description Workaround/Solution

DR4000_RelNotes_book.book Page 7 Monday, January 23, 2012 12:13 PM

8DR4000 System Release Notes, Release 1.0

7567

CommVault

reports

failures if

restoring

using CIFS

when using

options to

ignore ACLs

even when

the restore

operation

succeeds.

The DR4000 system does not

support a CIFS-based access control

list (ACL) native to the Microsoft

Windows filesystem.

If an administrator tries to restore a

backup image on to a different

system container, the system does

not support preserving the ACL for

the individual files that are part of

the CommVault (CV) backup

image.

Some administrators attempt to

avoid finding new disk space to

restore an image by assuming they

will get 100% deduplication and use

less physical space on the disk.

Administrators should not

restore files on the DR4000

system that depend upon CIFS

and an ACL for individual files

that need to be preserved.

8028

Network

restart should

say whether

DNS is

updated or

not every

time (or if

something

changes).

If DHCP is configured, the domain

and IP addressing information is

updated automatically. Make sure

that the information received from

the local DNS server is correct.

This issue is magnified when

replication has been configured with

a hostname, but has a different

domain name (for example,

acme.com is the DNS suffix in

DHCP and the hostname DNS

suffix is acmewest.com).

Check to verify that the

information is correct by using

the following DR4000 system

CLI command:

system --show

8099

Relay server

does not

work as IP or

FQDN (use

only

hostname).

When an administrator configures

e-mail to receive system alerts from

the DR4000 system, the relay host

has to be configured. When

configuring the relay host only the

hostname should be given (since the

DNS suffix is automatically

appended, this is what causes the

issue).

Use only the hostname, and send

test e-mail messages to verify

that e-mails are received by all

recipients.

Table 2. Known Configuration Issues and Workarounds for Release 1.x

(continued)

Issue Description Workaround/Solution

DR4000_RelNotes_book.book Page 8 Monday, January 23, 2012 12:13 PM

DR4000 System Release Notes, Release 1.0 9

8402

"replication --

update" fails

if the peer

container

whose IP is

changed is

offline.

This issue can occur when an

administrator has configured

replication to use the IP address

instead of a fully qualified domain

name (FQDN) for a remote

DR4000 system, and the IP address

has been changed because of a

network topology change.

The administrator needs to

update the configuration

database with the new IP

address. This update can only

take place when the remote

DR4000 system is also active

because this is a synchronous

operation.

8449

Hostname on

the appliance

is not always

the name

configured at

initialization.

When an administrator configures a

DR4000 system with a hostname

"A", and DHCP assigns it different

hostname, it is not apparent that

this change has taken place.

Administrators need to ensure

that the configured hostname

and the DHCP-assigned

hostname are the same.

Use the DR4000 system GUI to

check the System Name in the

System Information pane on the

Dashboard page, or use the

DR4000 CLI command:

system --show

Table 2. Known Configuration Issues and Workarounds for Release 1.x

(continued)

Issue Description Workaround/Solution

DR4000_RelNotes_book.book Page 9 Monday, January 23, 2012 12:13 PM

10 DR4000 System Release Notes, Release 1.0

8559

system --stats

do not get

updated

immediately

for unlinks/

truncates, or

overwrites.

For unlinks/truncates, when a file is

unlinked, the Current Bytes, Post

Deduplication Bytes, and

Deduplication Savings do not get

updated immediately.

The cleaner operation needs to

complete its cycle before these

values get updated.

For overwrites, when a file gets

overwritten, the Current Bytes

reflects this change correctly except

when the overwritten file is the

same exact file size.

However, the overwritten content is

cleaned up by the cleaner operation

in the background similar to how

unlinks/truncates are updated with

Post Deduplication and

Deduplication Savings updated

after the cleaner operation is

completed.

There is no current workaround

or solution.

Cleaner operations are designed

to be a background process.

8583

Replication

down event

was not sent

from source

container

when target

entered

Maintenance

mode.

When a target DR4000 system in a

source-target pair enters

Maintenance mode, no notification

is sent to the administrator from the

source DR4000 system about this

mode change.

The only workaround is to rely

on system alerts and

notifications from the target

DR4000 system.

Table 2. Known Configuration Issues and Workarounds for Release 1.x

(continued)

Issue Description Workaround/Solution

DR4000_RelNotes_book.book Page 10 Monday, January 23, 2012 12:13 PM

DR4000 System Release Notes, Release 1.0 11

Table 3. Known Configuration Issues and Workarounds for Release 1.0

Issue Description Workaround/Solution

1994

Linux CIFS

client may

corrupt files

due to issues

with some

client types.

The DR4000 system does not

support Linux clients mounting

on CIFS.

There is no workaround or

solution. The DR4000 system

only supports Linux clients

mounting from NFS.

5957

Backup Exec

restore fails

with "Backup

media errors."

When the DR4000 system enters

Maintenance mode, from the

Backup Exec 2010 perspective

some contents of the physical

media library disappear from the

backup folder. This can cause the

restore operation to fail, and then

cause a Backup media error

message to display.

After the DR4000 system

completes its Maintenance

mode and returns to its

operational state, Backup Exec

should perform the following:

• Rescan the backup folder to

reconnect to the media.

• Restart the restore operation.

5995

A potential

data issue can

occur when

using multiple

DR4000

containers for a

single CV

backup, and

replication is

not enabled on

all containers.

The best practice when using

multiple DR4000 containers for

performing a single CommVault

(CV) backup and using the

DR4000 replication feature, is to

enable replication for all

containers in the CV backup.

Make sure that replication is

enabled for all of the DR4000

containers that are involved in

the CV backup.

DR4000_RelNotes_book.book Page 11 Monday, January 23, 2012 12:13 PM

12 DR4000 System Release Notes, Release 1.0

7351

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