Promise Technology 2-Year Extended Warranty for VessR2000 RAID Head - Manual (Page 657)

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Vess R2000 Series Product Manual Promise Technologies
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The dirty cache LED (marked with the icon) informs you that there is data in the cache that has not been
saved to non-volatile memory. Such data is sometimes called “dirty,” not to suggest it is corrupted in some way
but because it has not been saved to a physical drive.
Dirty Cache LED
Caution
If there is unsaved data in the controller’s cache, the dirty cache
LED shines amber. During this time, do NOT power down the Vess.
Wait until the LED goes dark.