Business Copy; Basic Write-To-Disk Setup; Vls Compared To Application-Based Write-To-Disk - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

Figure 3 Basic Write-to-disk Setup
.
Table 1 VLS Compared to Application-based Write-to-disk
Setup and manage-
ment 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 perform-
ance).
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.
HP StorageWorks VLS and D2D Solutions Guide
Write-to-disk
Requires configuration of RAID groups,
LUNs, volumes, and file systems.
No device-side data compression avail-
able.
Performance dependent on target array or
server.
Free or licensed per TB in most backup
applications.
Higher management overhead.
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