Date: Thu, 13 Jul 1995 11:13:20 -0500 (CDT) From: Karl Denninger <karl@Mcs.Net> To: davidg@Root.COM Cc: karl@Mcs.Net, freebsd-hackers@freebsd.org Subject: Re: SCSI disk wedge Message-ID: <199507131613.LAA01942@Jupiter.mcs.net> In-Reply-To: <199507131536.IAA05001@corbin.Root.COM> from "David Greenman" at Jul 13, 95 08:36:06 am
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> > >Since there are no errors presented to us when the 1742 hangs, and the > >2742 starts complaining about timeouts, I don't know where to go next. > >Tagged queueing is not at issue; I have tried with it both enabled and > >disabled. With it *ON* the incidence of the hangs is reduced, but not > >eliminated. > > > >It LOOKS like something has requested an action on the SCSI bus which is > >causing problems (ie: disconnect sequencing, etc) for devices, and/or the > >adapter itself, causing a wedge condition. Why this is not detectable and > >correctable (or at least abortable with a panic) in the driver is unknown > >to me. The kernel IS running -- I can telnet to the machine affected and > >get connected, but any disk I/O attempt goes nowhere. > > > >There is a difference -- the 2742 is MORE stable than the 1742. The > >1742 machines run about 8 hours before dying -- the 2742 with MUCH > >heavier load on it can, in some cases, run for 2-3 days. > > I suspect that BSDI runs longer because it detects the wedge and can > successfully unjam the bus. FreeBSD is known broken in this regard, and > several people are working on fixing it. > > -DG If that's happening, it is happening silently. We haven't gotten any error messages related to SCSI issues on BSDI. -- -- Karl Denninger (karl@MCS.Net)| MCSNet - The Finest Internet Connectivity Modem: [+1 312 248-0900] | (shell, PPP, SLIP, leased) in Chicagoland Voice: [+1 312 248-8649] | 7 Chicagoland POPs, ISDN, 28.8, much more Fax: [+1 312 248-9865] | Email to "info@mcs.net" WWW: http://www.mcs.net ISDN - Get it here TODAY! | Home of Chicago's only FULL AP Clarinet feed!
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