Date: Mon, 21 Apr 1997 20:40:54 +0200 (MET DST) From: Wilko Bulte <wilko@yedi.iaf.nl> To: gibbs@plutotech.com (Justin T. Gibbs) Cc: Alan.Judge@indigo.ie, freebsd-scsi@freebsd.org Subject: Re: Vendor specific ASCQ SCSI errors in 2.2-STABLE Message-ID: <199704211840.UAA00759@yedi.iaf.nl> In-Reply-To: <199704211520.JAA09950@pluto.plutotech.com> from "Justin T. Gibbs" at Apr 21, 97 09:19:08 am
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As Justin T. Gibbs wrote... > >I sometimes get errors of the form: > > sd0(ahc0:0:0): ABORTED COMMAND asc:41,86 Vendor Specific ASCQ, retries > >:4 > >only under high load and on multiple different disks (as far as I can reproduc > >e > >the problem). > > >From a quick look at the Atlas II tech ref I have here, this is: > > DDMA overrun or REQ/ACK overrun/underrun error. This could well be a glitch on the REQ/ACK lines. Having bus stubs (inside the canisters) makes the drives vulnerable to this problem. Any chance you can try things without the canisters? (I know, a horrible lot of work). An active terminator on the end of the bus instead of a drive-internal terminator in a canister is also worthwile. Wilko _ ____________________________________________________________________ | / o / / _ Bulte email: wilko@yedi.iaf.nl - Arnhem, The Netherlands |/|/ / / /( (_) Do, or do not. There is no 'try' - Yoda --------------------------------------------------------------------------
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