From: Stephen Wille Padnos <stephenwp@adelphia.net>
To: "A.Sajjad Zaidi" <sajjad@vgkk.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Promise, DMA and RAID5 problems running 2.4.1
Date: Wed, 07 Feb 2001 21:06:57 -0500 [thread overview]
Message-ID: <3A81FF41.316BF761@adelphia.net> (raw)
In-Reply-To: <Pine.LNX.4.10.10102070924340.19012-100000@coffee.psychology.mcmaster.ca> <3A81FDAF.43DE0791@vgkk.com>
"A.Sajjad Zaidi" wrote:
> > do you understand that you can't really have raid on ide involving
> > two drives on the same channel?
>
> Is that just because of performance or are there other problems? Its working
> fine as it is, but Im considering setting up all drives as masters (2x
> ATA-100, 2x ATA-66).
It's because IDE is a blocking bus - each drive must complete its' task before
the data bus is released for the next IO operation. So, the first drive will
finish writing to the disk before the second drive can start. (That's one
reason why SCSI is preferred for high end systems - you can "disconnect" from
an IO operation to allow other IO's to be sent to other devices on the same
bus)
--
Stephen Wille Padnos
Programmer, Engineer, Problem Solver
swpadnos@adelphia.net
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next prev parent reply other threads:[~2001-02-08 2:11 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.10.10102070924340.19012-100000@coffee.psychology.mcmaster.ca>
2001-02-08 2:00 ` Promise, DMA and RAID5 problems running 2.4.1 A.Sajjad Zaidi
2001-02-08 2:06 ` Stephen Wille Padnos [this message]
2001-02-07 20:40 Petr Vandrovec
2001-02-07 20:06 ` Alan Cox
2001-02-07 20:53 ` Andre Hedrick
2001-02-09 8:09 ` Vojtech Pavlik
-- strict thread matches above, loose matches on Subject: below --
2001-02-07 13:15 Petr Vandrovec
2001-02-07 19:33 ` Alan Cox
2001-02-08 5:07 ` A.Sajjad Zaidi
2001-02-07 10:12 A.Sajjad Zaidi
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