Re: SATA HD & DMA ?
From: Michael Heiming (michael+USENET_at_www.heiming.de)
Date: 08/31/04
- Previous message: John-Paul Stewart: "Re: SATA HD & DMA ?"
- In reply to: John-Paul Stewart: "Re: SATA HD & DMA ?"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Date: Tue, 31 Aug 2004 18:14:16 -0000
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
NotDashEscaped: You need GnuPG to verify this message
In comp.os.linux.hardware John-Paul Stewart <jpstewart@binaryfoundry.ca> suggested:
> The Real Slim Shady wrote:
>> On Tue, 31 Aug 2004 11:28:42 -0400, John-Paul Stewart wrote:
>>
>>
>>>>Might depend on how your system uses SATA, mine recognizes them as SCSI
>>>>and those hdparm settings don't work with SCSI.
>>>
>>>Do SATA drives have any mode of operation other than DMA? It my
>>>understanding that with SCSI turning DMA on/off is with hdparm is
>>>impossible because DMA is the only possible mode of operation. I'd expect
>>>it to be the same with SATA.
>>
>> From man hdparm:
>> Although this utility is intended primarily for use with (E)IDE
>> hard disk devices, several of the options are also valid (and
>> permitted) for use with SCSI hard disk devices and MFM/RLL hard
>> disks with XT inter- faces.
> But as the previous poster showed, the -d option to hdparm is *not*
> valid for use with SCSI disks. Note the keyword "several", not "all"
> options.
Yup, dunno the point of posting a few lines of man hdparm?
The only options I'm using are -tT on SCSI, just to check for
reasonable numbers, if you know the drive speed.
> The ones that do work: a, E (for SCSI CD-ROMs), f, g, r, t, T. I can't
> test -L (no suitable hardware) but it should work too. Options listed
> in the man page as "dangerous" weren't tried. Aside from that, *all
> other* hdparm options fail on SCSI drives. (Real SCSI, no idea about
> SATA drives that the kernel sees as SCSI.)
AFAIK, the kernel doesn't know much about the RAID, it just
recognizes the device (scsi0: 3ware Storage Controller) through
the 3w_xxxx module loaded from initrd as SCSI.
Only the 3ware provided tool 'tw_cli' can configure the
controller and see the real devices in the array:
3ware CLI> help
Copyright (c) 2003 3ware, Inc. All rights reserved.
3ware CLI (version 2.00.00.032b)
Commands Description
-------------------------------------------------------------------
info Displays information about the controller
alarms Displays or deletes the list of AENs
set Displays or modifies controller settings
maint Performs maintenance operations on a controller
quit Exits the CLI
Type help <command> to get more details about a particular
command.
Runs great.
;)
-- Michael Heiming (GPG-Key ID: 0xEDD27B94) mail: echo zvpunry@urvzvat.qr | perl -pe 'y/a-z/n-za-m/' -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFBNL/3AkPEju3Se5QRAhqGAKCwmswHmR9Htx0hXnEadXchO1L91gCgjA4b LYyClst28DNrpsnzUsa7m6U= =S1ds -----END PGP SIGNATURE-----
- Previous message: John-Paul Stewart: "Re: SATA HD & DMA ?"
- In reply to: John-Paul Stewart: "Re: SATA HD & DMA ?"
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Relevant Pages
|
