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Groups > comp.os.linux.hardware > #2591
| From | Aragorn <thorongil@telenet.be.invalid> |
|---|---|
| Newsgroups | comp.os.linux.hardware |
| Subject | Re: Bad Hitachi disk.... how so from a pic? |
| Followup-To | comp.os.linux.hardware |
| Date | 2014-12-07 22:27 +0100 |
| Organization | A noiseless patient Strider |
| Message-ID | <m62gnd$df2$1@dont-email.me> (permalink) |
| References | (5 earlier) <m61th4$qc1$2@dont-email.me> <m61u55$p5n$3@dont-email.me> <m620ci$7bb$1@dont-email.me> <m6238e$jcl$1@dont-email.me> <m62ec0$2kc1$1@saria.nerim.net> |
Followups directed to: comp.os.linux.hardware
On Sunday 07 December 2014 21:46, Pascal Hambourg conveyed the following
to comp.os.linux.hardware...
> Aragorn a écrit :
>>
>> The thing with SCSI is that it requires a SCSI controller, and then
>> the controller takes care of all the head positioning etc. With IDE
>> (PATA/SATA), all of that has to be executed by the CPU on the
>> mainboard.
>
> Neither the SCSI host controller nor the host CPU care about head
> positioning. They don't even know how many physical heads the disk
> has. That's all the task of the disk embedded controller.
You are right ─ I was miswording what I actually meant In the event of
a machine with an ATA hard disk, almost everything on account of disk
I/O is handled by the CPU on the mainboard, while in the event of a SCSI
controller, the operating system offloads a great deal of those low-
level tasks onto the controller itself, which (of course) has its own
dedicated (and typically specialized) processor(s). (Some Adaptec
SAS/SCSI/SATA RAID adapters for instance run their own local embedded
Linux-based system via a SoC processor.)
Of course, things like filesystem layout and block/extent addressing are
still handled by the filesystem driver in the operating system kernel,
and thus take up a certain percentage of normal mainboard CPU time.
--
= Aragorn =
http://www.linuxcounter.net - registrant #223157
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Bad Hitachi disk.... how so from a pic? Jax <remove.bear.bottoms1@gmail.com> - 2014-12-06 14:44 +0000
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-06 09:44 -0600
Re: Bad Hitachi disk.... how so from a pic? notbob <notbob@nothome.com> - 2014-12-06 19:37 +0000
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-06 14:54 -0600
Re: Bad Hitachi disk.... how so from a pic? Jax <remove.bear.bottoms1@gmail.com> - 2014-12-06 22:50 +0000
Re: Bad Hitachi disk.... how so from a pic? notbob <notbob@nothome.com> - 2014-12-06 23:13 +0000
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-07 04:57 -0600
Re: Bad Hitachi disk.... how so from a pic? Aragorn <thorongil@telenet.be.invalid> - 2014-12-07 16:52 +0100
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-07 09:59 -0600
Re: Bad Hitachi disk.... how so from a pic? Aragorn <thorongil@telenet.be.invalid> - 2014-12-07 17:10 +0100
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-07 10:48 -0600
Re: Bad Hitachi disk.... how so from a pic? Aragorn <thorongil@telenet.be.invalid> - 2014-12-07 18:37 +0100
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-07 12:28 -0600
Re: Bad Hitachi disk.... how so from a pic? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2014-12-07 21:46 +0100
Re: Bad Hitachi disk.... how so from a pic? Aragorn <thorongil@telenet.be.invalid> - 2014-12-07 22:27 +0100
Re: Bad Hitachi disk.... how so from a pic? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2014-12-08 00:36 +0100
Re: Bad Hitachi disk.... how so from a pic? Richard Kettlewell <rjk@greenend.org.uk> - 2014-12-08 09:26 +0000
Re: Bad Hitachi disk.... how so from a pic? Aragorn <thorongil@telenet.be.invalid> - 2014-12-08 11:31 +0100
Re: Bad Hitachi disk.... how so from a pic? Richard Kettlewell <rjk@greenend.org.uk> - 2014-12-08 10:53 +0000
Re: Bad Hitachi disk.... how so from a pic? Aragorn <thorongil@telenet.be.invalid> - 2014-12-08 17:48 +0100
Re: Bad Hitachi disk.... how so from a pic? Richard Kettlewell <rjk@greenend.org.uk> - 2014-12-08 17:28 +0000
Re: Bad Hitachi disk.... how so from a pic? Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2014-12-08 08:43 -0600
Re: Bad Hitachi disk.... how so from a pic? Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2014-12-09 11:02 +0100
Re: Bad Hitachi disk.... how so from a pic? scott@alfter.diespammersdie.us (Scott Alfter) - 2014-12-09 23:35 +0000
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-09 17:43 -0600
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-09 17:54 -0600
Re: Bad Hitachi disk.... how so from a pic? scott@alfter.diespammersdie.us (Scott Alfter) - 2014-12-10 20:22 +0000
Re: Bad Hitachi disk.... how so from a pic? scott@alfter.diespammersdie.us (Scott Alfter) - 2014-12-10 20:27 +0000
Re: Bad Hitachi disk.... how so from a pic? philo <philo@privacy.net> - 2014-12-10 16:40 -0600
Re: Bad Hitachi disk.... how so from a pic? Thomas Richter <thor@math.tu-berlin.de> - 2014-12-10 11:06 +0100
Re: Bad Hitachi disk.... how so from a pic? Baho Utot <baho-utot@invalid.com> - 2014-12-06 13:39 -0500
Re: Bad Hitachi disk.... how so from a pic? Jax <remove.bear.bottoms1@gmail.com> - 2014-12-06 22:51 +0000
Re: Bad Hitachi disk.... how so from a pic? Johnny <johnny@invalid.net> - 2014-12-06 13:02 -0600
Re: Bad Hitachi disk.... how so from a pic? Keith Keller <kkeller-usenet@wombat.san-francisco.ca.us> - 2014-12-06 16:04 -0800
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