Subj : Re: Move bookworm system from SSD to NVME
To   : Lawrence D'Oliveiro
From : =?UTF-8?Q?Bj=C3=B6rn_Lundin?=
Date : Sat Aug 03 2024 13:54:33

On 2024-08-03 03:27, Lawrence D'Oliveiro wrote:
> On Fri, 2 Aug 2024 15:12:57 +0100, The Natural Philosopher wrote:
>
>> SSDS/NVM have their own internal  caching.
>
> True for all drives, unfortunately.
>
> It’s bloody stupid, because the drive caching is on the wrong side of the
> drive interface. Better to leave it to the OS, which can use main RAM for
> its filesystem caching, on the fast side of that drive interface.
>
> When a drive says to the OS driver “write is done”, it should mean “write
> has gone to actual persistent storage”, not “write is in my cache”.


I think they cause grief in the postgres mail lists some 15-20 years ago.
They were called 'lying IDE-disks' and were not popular in that crowd.


--
/Björn

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