[Info-vax] RX2800 sporadic disk I/O slowdowns

[Arne Vajhøj]

On 10/19/2024 9:04 PM, Lawrence D'Oliveiro wrote:
> On Fri, 18 Oct 2024 17:09:44 -0500, Craig A. Berry wrote:
>> That is exactly what happens when the cache battery on a RAID controller
>> dies.
> 
> Here’s another question: why does a disk controller need a battery-backed-
> up cache? Or indeed any cache at all?

Better performance.

> Is this because it tells lies to the OS, saying that the data has been
> safely written to disk when in fact it hasn’t?

If the battery is OK then it is reasonable safe as it will survive both
system crash and power outage.

Arne