Carlos E. R. wrote:
On 27/01/2021 10.45, Stakanov wrote:
A question about "battery": is it still an argument if you system is backed up by an UPS? I thought the batteries on controller cards were paramount only on systems that are not protected by a convenient UPS. Wrong?
The idea is, I assume, that battery backed hardware raid detects that the power died and commits everything to disk before finally powering down the HDs.
The battery is there to power the write cache memory until mains power returns. These days it is flash backed cache, not battery backed.