Storage 101: Bringing Up SAN Garry Moreau Senior Staff Alliance Consultant Ciena Communications (763)

DAS – Direct Attached Storage DAS Storage is captive behind server CPU Data Access is file system and platform dependant Server CPU must handle user I/O requests Costly to scale, complex to manage Intranet

NAS – Network Attached Storage NAS File Oriented Access Multiple Clients Shared Access to Data

SAN – Storage Area Network SAN Block Level I/O Access Interconnects different types of storage devices SANs can incorporate subnetworks with network-attached storage (NAS) systems Intranet

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 Vaulting Tape On-site Tape Back-up Off - site (trucks) Disk Consolidation More Less Delayed Immediate Mission Critical Applications Less Amount of Data Recovery Time Importance of Data -site - -up GDPS/STP Metro Mirror Global Mirror Global Copy Tier 7 Tier 6 Global Mirror for zSeries Tier 4 Critical Applications Non Critical Applications

Disaster Recovery Concepts SecsMinsHrsDays WksSecsMinsHrsDays Wks Recovery Point Recovery Time Recovery Point Objective (RPO) Recovery Point Objective (RPO) – Point in time to which applications data must be recovered to resume business transactions Recovery Time Objective (RTO) Recovery Time Objective (RTO) – Maximum elapsed time required to complete recovery of application data

Tape Backup SecsMinsHrsDays WksSecsMinsHrsDays Wks Recovery Point Recovery Time Recovery Point Objective (RPO) Business needs drive the technology choice Synchronous Replication Periodic Replication Asynchronous Replication

Tape Restore SecsMinsHrsDays WksSecsMinsHrsDays 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 SourceTarget 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 MAN WAN MAN WAN DS3, OC- 3/12/48 STM-1/4/16 DS3, OC- 3/12/48 STM-1/4/16 OR OC-3/12/48 STM-1/4/16 OC-3/12/48 STM-1/4/16 CN 2000

Asynchronous Mirroring MAN WAN MAN WAN DS3, OC- 3/12/48 STM-1/4/16 DS3, OC- 3/12/48 STM-1/4/16 OR OC-3/12/48 STM-1/4/16 OC-3/12/48 STM-1/4/16 CN 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