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Figure 3 Basic Write-to-disk Setup
Table 1 VLS Compared to Application-based Write-to-disk
Setup and
management
complexity
Data compression
Performance
Cost
Business Copy
Using a business-copy solution (array snapshots/clones) generally involves a much higher cost
than a virtual library system. You might, however, implement such a solution if:
Virtually instant recovery is critical.
You need to leverage a high-availability investment.
You are doing image recovery rather than file recovery.
You need a zero downtime solution.
Virtual tape devices
Sets up just like a physical tape library.
Software or hardware enabled (software
compression generally decreases
performance).
Hardware devices are tuned for sequential
read and write operations.
More expensive acquisition cost.
Backup software licenses as if physical library
or per TB.
Storage efficiency gained through
compression.
Lower management overhead.
Write-to-disk
Requires configuration of RAID groups, LUNs,
volumes, and file systems.
No device-side data compression available.
Performance dependent on target array or
server.
Free or licensed per TB in most backup
applications.
Higher management overhead.
Disk-based Backup and Virtual Tape Libraries
13
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