Storage Management Strategies for the CIO
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7. And last but not least, your available budget
This is a no-brainer. Many companies, when faced with the real world costs of disaster recovery, tend to get shell-shocked. Consider the costs:
Floor space
Servers for the recovery site
Staff for the recovery site
Storage hardware and licenses
Software licenses
Services to implement the solution
Services to determine what needs to be copied, and why
Network links (this is usually the most expensive part)
Network based SAN extension gear
The costs can add up quick. This sometimes makes the CTAM method look like a wonderful idea. (CTAM= Chevy Truck Access Method or, dump your backup tapes in the back of a truck and drive your data to the remote site).
Most common hardware based data replication solutions:
Synchronous:
EMC SRDF
IBM PPRC
HP DRM
HDS TrueCopy sync
Asynchronous:
HDS TrueCopy async
HP DRM
Adaptive (bulk) copy:
All the hardware vendors
The most common appliance-based data replication:
HP StorageApps
FalconStor
The most common software based solutions:
Host-based mirrorsets over iSCSI
Legato Octopus and RepliStor
Topio SANSafe (this also does ASYNC with write order fidelity)
NSI Doubletake
Veritas VVR and VSR (Veritas VVR does ASYNC with write order fidelity)
Fujistu Softek TDMF
Peer software?s PeerSync
Diasoft File Replication Pro
Insession replication suite
SoftwarePursuits SureSync
XOsoft WANSync
Sunopsis Java replication suite
Outsourcing:
All the data storage companies out there that let you connect to their storage over a fast connection, and let them worry about keeping the data safe.
Chris
Editor's note: Do you agree with this expert's response? If you have more to share, post it in one of our .bphAaR2qhqA^0@/searchstorage>discussion forums.
This was first published in January 2003
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