From: Douglas Gilbert <dougg@torque.net>
To: Thomas Soddemann <Thomas.Soddemann@rzg.mpg.de>
Cc: linux-scsi@vger.kernel.org
Subject: Re: ide-scsi with ide-hd?
Date: Fri, 06 Dec 2002 21:28:47 +1100 [thread overview]
Message-ID: <3DF07BDF.8070907@torque.net> (raw)
In-Reply-To: 3DF06AD0.5070507@rzg.mpg.de
Thomas Soddemann wrote:
> Hi,
>
> does anybody know whether there is there a possibility to use ide-scsi
> in connection with an IDE HD?
No, "ide" disks use the ATA standards (reference: www.t13.org)
while ide tapes, floppies and cdroms tend to use the ATA
Packet Interface (ATAPI) which is essentially a SCSI
command set over an ide transport. The command set used by
cdwriters is MMC (reference: www.t10.org ).
> If so, where can I get more information from? By looking at the source
> of ide-scsi I get the impression, that only IDE devices work, which have
> a kind of SCSI origin.
SCSI standards (www.t10.org) are essentially split into two layers:
- command sets (e.g. primary (SPC), block (SBC),
multi-media? (MMC) )
- transports (e.g. parallel (SPI), fibre channel (FCP),
ieee1394 (sbp) )
The definitions of some important transports (e.g. ATAPI
and USB mass storage) are found at their respective sites
(i.e. not on www.t10.org ).
> The intention is to use IDE HDs via the ide-scsi driver in connection
> with a special file system (GPFS), since it does not (at least not
> officially) support IDE drives.
The ide-scsi driver looks like it is going away in the
2.5 series **. Cdrecord controlled cd/dvd writers via the
sg driver which used the ide-scsi driver to access
ATAPI devices. The SG_IO ioctl inside the sg driver
been ported to the block level so now cdrecord
can control both ATAPI writers directly via their
block devices (e.g. /dev/hdd) and "real" SCSI (or
pseudos like USB and 1394) via their block devices
(e.g. /dev/sdc0).
Unfortunately none of this helps you with an ATA _disk_.
> Single node harddisk performance is not
> really an issue, since GPFS is a parallel filesystem, and it will be
> used with GBit Ethernet, in our case.
** Are there ATAPI tape drives using the ide-scsi driver?
Doug Gilbert
next prev parent reply other threads:[~2002-12-06 10:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-06 9:16 ide-scsi with ide-hd? Thomas Soddemann
2002-12-06 10:28 ` Douglas Gilbert [this message]
2002-12-06 10:48 ` Thomas Soddemann
2002-12-06 13:45 ` Willem Riede
2002-12-06 14:54 ` Alan Cox
2002-12-06 13:03 ` Alan Cox
2002-12-07 18:37 ` Andre Hedrick
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