preston design backupsd 03

8/2/2019 Preston Design BackupSD 03

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Designing a

Backup ArchitectureThat Actually Works

W. Curtis PrestonPresident/CEOThe Storage Group


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What are the design

options?


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SAN: LAN-free, Client-free, and Server-freebackup

NAS: NDMP filer to self, filer to filer, filer to server, &server to filer

Ethernet

DataGeneral

BackupServer

IBM

Backup Client

IBM

Backup Client

FC

FC

Router

Library

SCSISCSI

Disk Array

NAS Server

FCFC

FC Switchor Hub

FC

NAS Server

NAS Server

LibraryFC Switch

or Hub

FC

SCSI

Library

FC

NASSAN SAN

Virtual tape


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LAN-based backups

Standard method

Central backup server

with network clients

backing up across the

LAN

Simplest, least

expensive design

la

ti

g

i

d

HEWLETTPACKARD

Data General

Backup

Server

TapeLibrary

Disk Disk Disk


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LAN-free backups How does this work?

SCSI Reserve/Release

Third-party queuingsystem

Levels of drive sharing

Restores

IBM

IBM

Disk

Disk

IBM

Disk

TapeLibrary

SCSI/FC

Router

SCSI

SCSI

SCSI

SCSI

FC

FC Switch

FC

FC

FC


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Client-free backups

Transaction Logs

TapeLibrary

DataSrvr

BackUpSrvrB

primarydisk set

backupmirror

1

3

2a

TapeLibrary

BackUpSrvrA

2c

2b

LAN

TapeLibrary

DataSrvr

BackUpSrvr

primarydisk set

backupmirror

Transaction Logs

2

1

TapeLibrary

BackUpSrvr

A

LAN

Backup transaction logs to disk

Establish backup mirrorTape

LibraryDataSrvr

BackUpSrvr

primary

disk set

backup

mirror

4a 4b

Transaction Logs

1

2

3Tape

Library

Back

UpSrvrA

LAN

Split backup mirror and back it up


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Server-free backups

Server directsclient to take acopy-on-writesnapshot

Client and server

record block andfile associations

Server sendsXCOPY requestto SAN

TapeLibrary

DataSrvr

SAN

w/xcopysupport

primarydisk set

backupmirror

orsnapshot

3

Transaction Logs

1

2

TapeLibrary

BackUpSrvr

A

LAN

Virtual Disk

Provided by

Disk Array

Block D

Block E

Block F

FileB

Block A

Block B

Block C

FileA


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Server-less Restores

Changing

block

locations

Image level

restores

File level

restores

Virtual DiskProvided byDisk Array

Block D

Block EBlock F

FileB

Block A

Block B

Block C

FileA

Tape

Snapshotor

Mirror

Block D

Block EBlock F

Block A

Block B

Block C

Virtual DiskProvided byDisk Array

Block D

Block E Block F

FileB (deleted)

Block A

Block B

Block C

FileA

Snapshotor

Mirror

Block A

Block B

Block C

Block D

Block EBlock F

Tape

Backup Restore


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Backing up a filer: NDMP Filer to self

Filer to filer

Filer to

server

Server to

filer

Similar to

server-free

backups

LAN

Filer Filer Filer

BackupServer

Tape library Tape libraryTape library

OtherServer

Server to Filer

Filer

toSelf

Filer to Filer

NDMP tapelibrary

Filerto

libraryFiler toServer


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Using NDMP Level of functionality depends on the DMA

and filer vendors

Robotic Support Filer to Library Support

Filer to Server Support

Direct access restore support

Image level backup


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Using diskATA-based storage arrays as low as $5/GB

(disk only, needs filesystem)

Special function arrays Quantum DX-30 looks and behaves like a Quantum P1000.

Can be used as target for tape-based backups

(3 usable TB, $55K list, or $18/GB)

NetApp R100 looks like other NetApp filer. Target for

SnapVault and disk-based backups, source for SnapMirror

(9+ usable TB, $175K list, or $18/GB)


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First Step: Backup to disk Use as a target for all

incremental backups.

(Full, too, if you can afford

it)

For off-site storage,

duplicate all disk-based

backups to tape.

Leave disk-based backups

on disk.


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Second Step: Mirror to disk Use dumb arrays and

smart volume managers

and replication software.

Use smart arrays withreplication built into them.

Most valuable methods

have built in point-in-time

snapshots.

Mirror to disk, then backup

to tape, or mirror to

another disk!


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Give it enough powerNot enough tape drives

Tape drives that arent

fast enough

Not enough slots in the

tape library

Not enough bandwidth

to the server


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Dont give it too much power

Streaming tape drives must be

streamed

If you dont, you will wear out

your tape drives and decrease

aggregate performance

Must match the speed of the pipe

to the speed of the tape

You can actually increase your

throughput by using fewer tape

drives


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Server Size/Power

I/O performance more important than

CPU power

CPU, memory, I/O expandability

paramount

Avoid overbuying by testingprospective server under load


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Catalog/database Size Determine number of files (n)

Determine number of days in cycle (d)

(A cycle is a full backup and its associated

incremental backups)

Determine daily incremental size (i = n * .02)

Determine number of cycles on-line (c)

150-250 bytesper file, per backup

Use a 1.5 multiplier for growth and error

Index Size = (n + (i*d)) * c * 250 * 1.5


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Number of Drives Disk/Tape Combo

LAN-based Backup

Buydisk system large enough to satisfy entire

on-site retention period without deletion. Buyenough tape drives to duplicate each nights

backups. Duplicate each nights backups to tape,

then take them out and send them offsite.

Library should be large enough to hold three tofour days of backups. (Only needs to hold

duplicated tapes until theyre sent off-site.)


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Library Size - slots (all tape environment) Should hold allonsite tapes

On-site tapes automatically expire and get

reused

Only offsite tapes require phys. mgmt.

Should monitor library via a script to ensure

that each pool has enough free tapes before

you go home

Watch for those downed drive messages


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Library Size - slots (disk/tape environment)

Do all backups to disk wherever possible.

Library only needs to hold the latest set of

copies (three or four days worth).

Disk-based backups automatically expire and

space gets reused.

Only off-site tapes require phys. mgmt.

Should monitor library and diskvia a script toensure that each pool has enough free space

before you go home

Watch for those downed drive messages


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Configuring your server

Backup all drives.

Make sure you are streaming your drives.

Create an automated monitoring system.

Establish standards wherever possible,and use them!


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Resources


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Resources

Directories of products to help you

build a better backup system

http://www.storagemountain.com

Send questions to:

[email protected]
http://www.storagemountain.com/http://www.storagemountain.com/


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Thank you!

W. Curtis PrestonPresident/CEO

The Storage Group

preston design backupsd 03

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