HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 12

What are the Alternatives?, Physical Tape, NAS, Application-based Disk Backup - storage array

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for a longer retention time on disk without needing significantly higher disk capacities, and the deduplication-enabled replication allows cost-effective off-site copying of the backups for disaster protection. What are the Alternatives? Alternatives to virtual tape solutions include: • Physical Tape • NAS (network attached storage) • Application-based Disk Backup (disk to disk, backup to disk, disk to disk to tape) • Business Copy (snapshot and clone solutions) Physical Tape Tape is the foundation for data protection and should be a part of most data protection solutions (except those with highly perishable data). Consider a direct-to-tape scheme if: • You are doing large image backups (such as databases), or • Your servers can stream the tape drives. and • You do not need fast single file restore, or • Your current backup window is not strained. NAS An alternative to a virtual library is a NAS device acting as a backup target (via NFS or CIFS network file system protocols). However, this protocol has significant performance and scaling limitations; writing backups over TCP/IP and NFS/CIFS to the NAS target uses much more CPU on the backup infrastructure compared to Fibre Channel SAN. In addition, a NAS mount point does not scale to the size of an enterprise virtual tape library. For example, a VLS can present a single virtual library target containing multiple petabytes of tape capacity with all backup jobs configured to use the one common shared high-performance high-capacity VLS backup device. Consider a NAS target if you: • Do not have high performance requirements. • Do not want to run SAN backups. • Do not need the backup target to significantly scale capacity or performance. • Want to run Data Protector "virtual full backups." Application-based Disk Backup Utilizing the file library functionality of backup applications is good for small or isolated jobs. When a large-scale implementation is required, virtual tape offers a more easily managed, higher performing solution. Consider a file library system if: • The application is in a LAN or LAN/SAN hybrid configuration. • Fewer than four servers write data to secondary disk storage. • You can redeploy existing arrays as secondary disk storage. • Your environment is static. 12 Concepts

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for a longer retention time on disk without needing significantly higher disk capacities, and the
deduplication-enabled replication allows cost-effective off-site copying of the backups for disaster
protection.
What are the Alternatives?
Alternatives to virtual tape solutions include:
•
Physical Tape
•
NAS
(network attached storage)
•
Application-based Disk Backup
(disk to disk, backup to disk, disk to disk to tape)
•
Business Copy
(snapshot and clone solutions)
Physical Tape
Tape is the foundation for data protection and should be a part of most data protection solutions
(except those with highly perishable data). Consider a direct-to-tape scheme if:
•
You are doing large image backups (such as databases),
or
•
Your servers can stream the tape drives.
and
•
You do not need fast single file restore,
or
•
Your current backup window is not strained.
NAS
An alternative to a virtual library is a NAS device acting as a backup target (via NFS or CIFS
network file system protocols). However, this protocol has significant performance and scaling
limitations; writing backups over TCP/IP and NFS/CIFS to the NAS target uses much more CPU
on the backup infrastructure compared to Fibre Channel SAN. In addition, a NAS mount point
does not scale to the size of an enterprise virtual tape library. For example, a VLS can present a
single virtual library target containing multiple petabytes of tape capacity with all backup jobs
configured to use the one common shared high-performance high-capacity VLS backup device.
Consider a NAS target if you:
•
Do not have high performance requirements.
•
Do not want to run SAN backups.
•
Do not need the backup target to significantly scale capacity or performance.
•
Want to run Data Protector “virtual full backups.”
Application-based Disk Backup
Utilizing the file library functionality of backup applications is good for small or isolated jobs.
When a large-scale implementation is required, virtual tape offers a more easily managed, higher
performing solution. Consider a file library system if:
•
The application is in a LAN or LAN/SAN hybrid configuration.
•
Fewer than four servers write data to secondary disk storage.
•
You can redeploy existing arrays as secondary disk storage.
•
Your environment is static.
12
Concepts