Editing RAID (section)

=== Write-cache reliability ===
There are concerns about write-cache reliability, specifically regarding devices equipped with a [[write-back cache]], which is a caching system that reports the data as written as soon as it is written to cache, as opposed to when it is written to the non-volatile medium. If the system experiences a power loss or other major failure, the data may be irrevocably lost from the cache before reaching the non-volatile storage. For this reason good write-back cache implementations include mechanisms, such as redundant battery power, to preserve cache contents across system failures (including power failures) and to flush the cache at system restart time.<ref>{{Cite web|url=https://www.snia.org/education/online-dictionary/w|title=Definition of write-back cache at SNIA dictionary|website=www.snia.org}}</ref>