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

[Arne Vajhøj]

On 10/19/2024 11:51 PM, Lawrence D'Oliveiro wrote:
> On Sat, 19 Oct 2024 21:52:16 -0400, Arne Vajhøj wrote:
>> The context is one where data loss is not acceptable.
> 
> Data loss is unavoidable. If the power goes out, all computations in
> progress get lost. There’s no way around that.

True, but that is not the issue.

There may be a lot of stuff in progress that may get lost, but
the point is that stuff that is complete and actions based on
it being complete may have been taken cannot be lost. When the
system comes up again then stuff in progress is like it never
happened while the completed stuff must still be completed.

Think transactions.

begin
# do a lot of stuff
# if the system crashes here the system comes up like nothing was done
commit
# if the system crashes here the changes must be there

Arne