Determining BC/DR Methods Recovery Time Objective – (RTO) Time needed to recover from a disaster How long can you afford to be without your systems Recovery.

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Determining BC/DR Methods Recovery Time Objective – (RTO)

Time needed to recover from a disaster

How long can you afford to be without your systems

Recovery Point Objective – (RPO)

Age of the data you want the ability to restore in the event of a disaster

Any data created or modified inside your recovery point objective will be either lost or must be recreated during a recovery

Network Recovery Objective – (NRO)

Time required to recover or fail over network operations

Completely Duplicated/Interconnected hot-site

Remote Disk Mirroring

Disk Mirroring

Shared Disk

Single Disk Copy

Electronic VaultingTape On-site

Tape Back-upOff-site (trucks)

Disk Consolidation

More

LessDelayed

Immediate

Mission CriticalApplications

LessAmountof Data

RecoveryTime

Importance ofData

-site

-site-up

GDPS/STP

Metro Mirror

Global Mirror

Global Copy

Tier 7

Tier 6

Global Mirror for zSeries

Tier 4

CriticalApplications

Non CriticalApplications

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Disaster Recovery Concepts

• Recovery Point Objective (RPO) –

Point in time to which applications data must be recovered to resume business transactions

• Recovery Time Objective (RTO) –

Maximum elapsed time required to complete recovery of application data

SecsMinsHrsDays Wks Secs Mins Hrs Days Wks

Recovery Point Recovery Time

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Tape Backup

SecsMinsHrsDays Wks Secs Mins Hrs Days Wks

Recovery Point Recovery Time

Recovery Point Objective (RPO)

• Business needs drive the technology choice

Synchronous Replication

Periodic Replication

Asynchronous Replication

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Tape Restore

SecsMinsHrsDays Wks Secs Mins Hrs Days Wks

Recovery Point Recovery Time

Recovery Time Objective (RTO)

• Business needs drive the technology choice

Recovery Time includes:• Fault detection

• Recovering data

• Bringing apps back online

Global Clustering Manual

Migration

Synchronous Mirroring

Source Target

I/O write received from host / server into cache of source

I/O is transmitted to the cache of the target

Receipt acknowledgment is provided by target back to cache of source

Ending status is presented to host / server

MANWANMANWAN

DS3, OC-3/12/48

STM-1/4/16

DS3, OC-3/12/48

STM-1/4/16

OROR

OC-3/12/48STM-1/4/16

OC-3/12/48STM-1/4/16

CN 2000CN 2000 CN 2000CN 2000

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Asynchronous Mirroring

MANWANMANWAN

DS3, OC-3/12/48

STM-1/4/16

DS3, OC-3/12/48

STM-1/4/16

OROR

OC-3/12/48STM-1/4/16

OC-3/12/48STM-1/4/16

CN 2000CN 2000 CN 2000CN 2000

Source Target

Ending status is presented to host / server

I/O write received from host / server is collected into Source

Source sends only final set of updates to target

Target receives updates and applies the writes to the volume