Since it is not tied to the proprietary systems of a specific storage manufacturer, solid-state disk caches
typically have a superior array of configuration options.
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).
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.
1 and upgrading magnetic disk cache
to 80GB, enables Schwab to improve customer service by increasing data availability, such as stock purchase and sale information and retrieval for customer tax purposes.
Subsequent reads of the same data block will be fulfilled from the solid-state disk cache
Configurations for testing as follows: Dell Latitude XPi P120ST with 120MHz Pentium processor, 16MB RAM, 256K secondary external cache, 810MB hard drive, IDE hard disk controller, 4MB hard 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.
hardware disk cache
, ATI GX video card with 2MB VRAM with macx.
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.