Re: RX2800 sporadic disk I/O slowdowns

On 10/20/2024 5:41 PM, Lawrence D'Oliveiro wrote:

On Sun, 20 Oct 2024 17:23:08 -0400, Arne Vajhøj wrote:

Loss of completed/committed data is the problem.

 The problem is not data loss, it is loss of data integrity. This is why we
have transactions in databases and filesystems: on a crash or loss of
power, we want transactions to be either completely lost or completely
saved, not in some in-between incomplete state.
 There is no caching disk controller that knows how to ensure this.

Let me try again.
DB write to plates & system crash => OK but slow
DB write to OS cache & system crash => potential problem with transaction
DB write to RAID controller with battery backup & system crash => OK and fast
Arne