Date: Sun, 15 Aug 1999 14:56:14 -0400 (EDT) From: Mike Nowlin <mike@argos.org> To: Warner Losh <imp@village.org> Cc: Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>, Mike Meyer <mwm@phone.net>, stable@FreeBSD.ORG Subject: Re: Random disk read problems Message-ID: <Pine.LNX.4.05.9908151446450.14977-100000@jason.argos.org> In-Reply-To: <199908150436.WAA22431@harmony.village.org>
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> In message <199908142104.OAA75747@cwsys.cwsent.com> Cy Schubert - ITSD Open Systems Group writes: > : I've been told that 1542's do not work well with multi-user/multi-taskin > : g O/S's. I'm not sure what SCSI controller you're using. Could it be > : that your controller is corrupting data when it is "very" busy? > > That's crap. Pure crap. The 1522's maybe, but not the 1542. They > have a good DMA architecture. There may be a bug in the 1542 driver > for FreeBSD, but it isn't the fault of the cards. > > And if there is a bug, I'd like to know how to recreate it so I can > fix it... > Here's a bit of possibly useful info... Quite a while ago, I had 1540B's and 1540C's installed on 486 66 & 100 boxes, with motherboards from different manufacturers... Under moderate load (such as copying several large files between different drives at the same time), the whole system would simply freeze -- a minute or so later, the kernel would start dumping out SCSI timeout error messages, and a reboot would be required... On every one of the machines that had this problem, pulling out the 486 board and dropping in a Pentium fixed it... Most of these machines started out as 386's, which never showed the problem until we upgraded to 486 boards. An interesting side note is that this behavior was exactly the same running under both FreeBSD and Linux.... hmmmm.... --Mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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