Sujet : Re: RX2800 sporadic disk I/O slowdowns
De : ldo (at) *nospam* nz.invalid (Lawrence D'Oliveiro)
Groupes : comp.os.vmsDate : 21. Oct 2024, 04:27:56
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vf4hnr$pqrl$2@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
User-Agent : Pan/0.160 (Toresk; )
On Sun, 20 Oct 2024 21:32:05 -0400, Arne Vajhøj wrote:
On 10/20/2024 9:28 PM, Lawrence D'Oliveiro wrote:
On Sun, 20 Oct 2024 21:17:06 -0400, Arne Vajhøj wrote:
On 10/20/2024 9:10 PM, Lawrence D'Oliveiro wrote:
On Sun, 20 Oct 2024 20:32:41 -0400, Arne Vajhøj wrote:
On 10/20/2024 8:28 PM, Lawrence D'Oliveiro wrote:
Transaction resilience is a standard thing with databases (and
journalling filesystems) going back decades.
>
Yes.
>
But they can't do miracles.
>
They can ensure, to a high degree of confidence, that the on-disk
structure is consistent. That is to say, each transaction is either
recorded as completed or not recorded at all, nothing in-between.
>
Only if it can rely on a successful write not being lost.
In other words, that the disk controller is not lying to you when it says
a write has completed?
Just that is is not lying when it says that it got it.
That’s not what it is saying. It is saying “write completed”.
A system crash and restart will blank RAM and wipe out all OS
and filesystem caches - it will not impact the cache in the
RAID controller.
You hope.
You really are a believer in miracles, aren’t you?
RX2800 sporadic disk I/O slowdowns
Re: RX2800 sporadic disk I/O slowdowns