SuperCache 5 - Mirror Mode
Desktop Systems

OVERVIEW   SuperCache's Mirror mode is a sophisticated yet elegant solution to the disk I/O bottleneck. Employing a patented hybrid cache, it mirrors a disk's entire volume/partition into RAM. In essence, a cache is created in RAM which maintains a one-to-one relationship with its associated volume. All data residing in the volume is also present in the cache! The file system, drive letter, and all other attributes of the original partition or volume are preserved.
How does Mirror Mode accelerate a program?  

If a program needs lots of data (e.g. images for a video game) it's much faster to have it come from RAM than from disk. When running a program with data on a mirrored volume, the disk-related delays and ‘hiccups’ normally experienced disappear! The program is no longer hampered by slow disk access, instead it can run smoothly at memory speed.

In addition, when a program needs to save information it will first be saved to RAM. Then, in the background, SuperCache's Mirror Mode will save these changes back to the physical disk for safekeeping. Therefore the program's disk I/O problem is greatly reduced, if not eliminated!

Write-through and write-deferred modes   SuperCache Mirror Mode supports write-through and write-deferred modes. In write-through mode, writes are immediately sent to the cache and to the disk. This eliminates the possibility of data loss in the mirror due to a system crash or power failure. In write-deferred mode, writes are immediately sent to the mirror cache only, and then to the disk at a later time. This mode of operation results in read- and write-performance similar to that of RamDisk. SuperSpeed recommends enabling the write-deferred (or lazy-write) feature ONLY on systems equipped with an Uninterruptible Power Supply (UPS).

A key prerequisite for Mirror Mode is to have, or create, a hard drive partition that is small enough to fit into available physical memory. For example, a system with 4 GB of RAM typically has around 3.5 GB available. Therefore, a 3 GB disk partition or volume could be mirrored into RAM. Note: caution should be exercised to leave sufficient memory free for the operating system, programs and services.

In the explanation above we talk about putting data (graphics, video, database etc.) on the mirrored partition or volume. Why? Because this data is the most frequently used. If there is enough RAM then entire programs, like action games, can be installed there and accelerated!

Creating the separate disk partition or volume that would be small enough for mirroring into RAM may require the use of third-party disk partitioning software.

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Updated 12 July, 2011

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