Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?

On 5/27/2025 9:19 AM, Anton Ertl wrote:

Stephen Fuld <sfuld@alumni.cmu.edu.invalid> writes:

On 5/27/2025 1:34 AM, Anton Ertl wrote:

Stephen Fuld <sfuld@alumni.cmu.edu.invalid> writes:

On 5/26/2025 12:19 PM, John Levine wrote:

According to Stefan Monnier  <monnier@iro.umontreal.ca>:

Stephen Fuld [2025-05-26 11:16:25] wrote:

https://www.seagate.com/innovation/multi-actuator-hard-drives/

[...]

It should draw less power and require less cooling;
one drive motor versus two

 Probably not for that reason, but because with two drives there are 4
case housing walls parallel to rotating platters (resulting in more friction) rather than 2 walls for the 2x18 drive.
 

and except for the read channel, half the
electronics.

 The fact that this is presented as two drives to the system makes me
suspect that the drive electronics is duplicated.

Not two drives, but two Logical Units (LUNS).  It's not two separate drives because there is only one host interface.  The two LUNS are like an old mainframe system where you might have a single controller with multiple drives behind it.  Note the interface is SAS, which is derived from the old parallel SCSI, which supported LUNS.  I may be wrong about this, but I don't believe SATA supports LUNS, but even if it does, that is still not two separate physical units.
So, without knowing for sure, I think the disk has one set of host interface electronics, one main CPU, one DRAM buffer, one motor control, etc.  It says that it can transfer from both disks (presumably at least one to/from the buffer) simultaneously, so it has two disk read channels and two disk write channels.  But I don't think anything else is duplicated.
--
  - Stephen Fuld
(e-mail address disguised to prevent spam)

Date	Sujet	#		Auteur
27 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	19		Stephen Fuld
27 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	18		Anton Ertl
27 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	17		Stephen Fuld
27 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	16		Anton Ertl
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	15		Stephen Fuld
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	14		Anton Ertl
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	2		Anton Ertl
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	1		Stephen Fuld
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	10		Stephen Fuld
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	9		Stefan Monnier
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	8		Stephen Fuld
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	7		Stefan Monnier
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	6		Stephen Fuld
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	5		Stefan Monnier
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	4		Stephen Fuld
28 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	2		MitchAlsup1
29 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	1		Stephen Fuld
29 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	1		Stefan Monnier
29 May 25	Re: fuzzy disks, Is Parallel Programming Hard, And, If So, What Can You Do About It?	1		John Levine

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