The alternative method is block-level caching, where the solid-state disk caches
data automatically and invisibly (at the block level).
The major tape library vendors are responding to disk-to-disk backup by making disk backup themselves (StorageTek) or by adding disk cache
front-ends to their tape libraries (StorageTek, ADIC, Quantum ATL).
Network clients may browse CD directories from the dedicated disk cache
faster than they could from the CD itself.
UpTempo's powerful disk cache
helps optimize system resource utilization by applying processor and memory resources to the I/O bottleneck problem.
In this model, data writes quickly into the front-end disk cache
and later writes to the back-end tape pool without impacting applications or backup performance.
and also features password protection, increased performance over SuperStor Version 2, and integral disk cache
, compatibility with extended memory and enhancements to Addstor's proprietary Universal Data Exchange (UDE) technology.
Subsequent reads of the same data block will be fulfilled from the solid-state disk cache
Topics Covered Executive Summary Introduction Methodology Overview of Hard Disk Drives Hard Disk Drive Components Disk Platters Substrate Material/Media Read/Write Heads Hard Disk Head Sliders and Arms Head Actuator-Voice Coil Motor (VCM) Hard Disk Spindle Motor Hard Disk Cache
Hard Disk Logic Board Hard Disk Connectors and Jumpers Casing Fixed Costs Overview of Solid State Drives Why Use an SSD?
The disk cache
buffer is so big that if data is going to be read, it's probably still in the disk buffer.
With policy-based retention of data on the disk cache
, the least recently used data is purged based on watermarks.
During backup, data is written into the disk cache
and eventually migrated down to tape media.
This practice mitigates system and drive resets and/or power failures that may put the data in disk cache
and controller cache at risk.