Re: Shutdown - 25 Years Later

From	"Carlos E.R." <robin_listas@es.invalid>
Newsgroups	comp.os.linux.misc
Subject	Re: Shutdown - 25 Years Later
Date	2025-04-25 23:20 +0200
Message-ID	<vtatdlxrcn.ln2@Telcontar.valinor> (permalink)
References	(9 earlier) <vu43gk$ucll$1@dont-email.me> <401kdlxknd.ln2@Telcontar.valinor> <vu9632$1iohp$2@dont-email.me> <isvmdlxre2.ln2@Telcontar.valinor> <vuc096$8fcm$5@dont-email.me>

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On 2025-04-24 02:23, Lawrence D'Oliveiro wrote:
> On Wed, 23 Apr 2025 13:35:14 +0200, Carlos E.R. wrote:
> 
>> On 2025-04-23 00:43, Lawrence D'Oliveiro wrote:
>>>
>>> On Tue, 22 Apr 2025 10:35:48 +0200, Carlos E.R. wrote:
>>>
>>>> ... I think it’s a dumb idea for drives to have their own cache.
>>>>
>>>> Not at all. There is a huge speed improvement.
>>>
>>> Not as fast as the OS can achieve by caching things in main RAM.
>>>
>>> Remember, the on-drive cache is on the wrong side of an interface
>>> (SATA, NVME etc) that is not designed to run at main RAM speeds.
>>> Whereas the interface between CPU and main RAM is. That’s why on-drive
>>> cache is a waste of time.
>>
>> The on drive cache is on the right side to take advantage of the drive
>> own algorithms to move the head. The firmware takes decisions on where
>> sectors actually are, and what sectors to actually read or write and in
>> what order. The operating system doesn't have actual knowledge of the
>> internal layout of the disk platters and can not optimize for the actual
>> situation.
> 
> Yes it can. It uses algorithms I previously mentioned -- scatter read,
> gather write, elevator seeking -- to assemble together large sequences of
> I/O requests, larger than any on-drive cache can handle.

No, it can not. It does not have the access.

> 
> All the on-drive cache can offer is another potential point where things
> can go wrong, leading to data loss.


-- 
Cheers, Carlos.

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Shutdown - 25 Years Later Farley Flud <ff@linux.rocks> - 2025-04-16 14:32 +0000
  Re: Shutdown - 25 Years Later Eli the Bearded <*@eli.users.panix.com> - 2025-04-18 04:34 +0000
    Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-18 05:56 +0000
      Re: Shutdown - 25 Years Later Eli the Bearded <*@eli.users.panix.com> - 2025-04-18 06:38 +0000
        Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-18 08:15 +0000
    Re: Shutdown - 25 Years Later Andy Burns <usenet@andyburns.uk> - 2025-04-18 08:53 +0100
      Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-18 08:16 +0000
        Re: Shutdown - 25 Years Later Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-04-19 14:19 +0000
          Re: Shutdown - 25 Years Later Jim Jackson <jj@franjam.org.uk> - 2025-04-19 21:10 +0000
            Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-19 22:22 +0000
            Re: Shutdown - 25 Years Later Richard Kettlewell <invalid@invalid.invalid> - 2025-04-20 08:13 +0100
              Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-20 10:31 +0100
              Re: Shutdown - 25 Years Later Pancho <Pancho.Jones@protonmail.com> - 2025-04-20 12:28 +0100
                Re: Shutdown - 25 Years Later Richard Kettlewell <invalid@invalid.invalid> - 2025-04-20 20:44 +0100
                Re: Shutdown - 25 Years Later not@telling.you.invalid (Computer Nerd Kev) - 2025-04-21 08:24 +1000
                Re: Shutdown - 25 Years Later not@telling.you.invalid (Computer Nerd Kev) - 2025-04-21 08:28 +1000
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-21 00:29 +0000
                Re: Shutdown - 25 Years Later "Carlos E.R." <robin_listas@es.invalid> - 2025-04-22 10:35 +0200
                Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-22 10:03 +0100
                Re: Shutdown - 25 Years Later "Carlos E.R." <robin_listas@es.invalid> - 2025-04-22 11:27 +0200
                Re: Shutdown - 25 Years Later Pancho <Pancho.Jones@protonmail.com> - 2025-04-22 10:37 +0100
                Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-22 12:13 +0100
                Re: Shutdown - 25 Years Later Pancho <Pancho.Jones@protonmail.com> - 2025-04-22 12:38 +0100
                Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-22 14:29 +0100
                Re: Shutdown - 25 Years Later Pancho <Pancho.Jones@protonmail.com> - 2025-04-23 12:55 +0100
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-22 22:49 +0000
                Re: Shutdown - 25 Years Later candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2025-04-23 19:20 +0000
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-24 00:24 +0000
                Re: Shutdown - 25 Years Later candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2025-04-25 17:50 +0000
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-25 23:15 +0000
                Re: Shutdown - 25 Years Later John Ames <commodorejohn@gmail.com> - 2025-04-28 07:45 -0700
                Re: Shutdown - 25 Years Later Richard Kettlewell <invalid@invalid.invalid> - 2025-04-28 20:18 +0100
                Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-29 12:15 +0100
                Re: Shutdown - 25 Years Later Richard Kettlewell <invalid@invalid.invalid> - 2025-04-29 18:29 +0100
                Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-29 21:18 +0100
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-29 03:02 +0000
                Re: Shutdown - 25 Years Later Richard Kettlewell <invalid@invalid.invalid> - 2025-04-22 18:20 +0100
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-22 22:45 +0000
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-22 22:46 +0000
                Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-23 06:29 +0100
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-22 22:46 +0000
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-22 22:43 +0000
                Re: Shutdown - 25 Years Later "Carlos E.R." <robin_listas@es.invalid> - 2025-04-23 13:35 +0200
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-24 00:23 +0000
                Re: Shutdown - 25 Years Later "Carlos E.R." <robin_listas@es.invalid> - 2025-04-25 23:20 +0200
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-25 23:14 +0000
                Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-26 10:32 +0100
                Re: Shutdown - 25 Years Later Richard Kettlewell <invalid@invalid.invalid> - 2025-04-26 17:08 +0100
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-26 22:56 +0000
                Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-26 22:52 +0000
      Re: Shutdown - 25 Years Later The Natural Philosopher <tnp@invalid.invalid> - 2025-04-18 10:15 +0100
        Re: Shutdown - 25 Years Later Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-04-19 00:06 +0000
  Re: Shutdown - 25 Years Later vallor <vallor@cultnix.org> - 2025-04-18 10:41 +0000
    Re: Shutdown - 25 Years Later % <pursent100@gmail.com> - 2025-04-18 06:17 -0700
    Re: Shutdown - 25 Years Later "Carlos E.R." <robin_listas@es.invalid> - 2025-04-18 15:29 +0200
  Re: Shutdown - 25 Years Later Farley Flud <ff@linux.rocks> - 2025-04-18 19:02 +0000

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