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From: "Craig A. Berry" <craigberry@nospam.mac.com>
Newsgroups: comp.os.vms
Subject: Re: RX2800 sporadic disk I/O slowdowns
Date: Sun, 20 Oct 2024 08:42:37 -0500
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On 10/19/24 10:51 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.

Yes, there is.  It's called battery-backed cache on a RAID controller,
and when the power goes out, any writes in progress still get written
because the battery supplies power to the cache.