Re: RX2800 sporadic disk I/O slowdowns

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