Write caching is a mechanism that attempts to separate the fast processing speed of the Iomega StorCenter px6-300d from the relatively slow mechanics of

actually writing data to drive.

With write caching disabled, every write to drive will cause the Iomega StorCenter px6-300d to wait while the data is written to drive, which can slow

performance. When write caching is enabled and the Iomega StorCenter px6-300d sends a write request to the drive, instead of writing directly to the drive,

it writes the data to cache (which is much faster) and sends an immediate acknowledgement to the Iomega StorCenter px6-300d saying the write is complete.

The system can then proceed without having to wait for the data to actually get written to drive, which will occur in the background.

While write caching does improve performance, there are some risks. Because the system will respond that the data has been written to drive when in fact it

has only been written to cache, should the Iomega StorCenter px6-300d lose power any data that did not get completely written to drive will be lost forever.

This is because cache memory is volatile. Therefore, if you lose power during a write, any pending writes in the cache that were not written to the drive yet

will be lost forever. Using a UPS (Uninterrupted Power Supply) can mitigate the risk associated with write caching, which is why it is recommended to only

enable this feature when a UPS is connected.

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