Date: Sun, 29 Sep 2002 10:51:09 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: "Hartmann, O." <ohartman@klima.physik.uni-mainz.de> Cc: Dan Nelson <dnelson@allantgroup.com>, freebsd-questions@FreeBSD.ORG Subject: Re: Writing to tape drive produces invalid requests Message-ID: <20020929012109.GB36702@wantadilla.lemis.com> In-Reply-To: <20020928230051.P5296-100000@klima.physik.uni-mainz.de> References: <20020928170452.GG7711@dan.emsphone.com> <20020928230051.P5296-100000@klima.physik.uni-mainz.de>
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On Saturday, 28 September 2002 at 23:02:54 +0200, Hartmann, O. wrote: > On Sat, 28 Sep 2002, Dan Nelson wrote: > >>> In the last episode (Sep 28), Hartmann, O. said: >>>> Hello. >>>> >>>> While writing to a tape drive unit I get this kernel log: >>>> >>>> (sa0:sym1:0:5:0): Invalid request. Fixed block device requests must be a multiple of 1024 bytes >>> >>> Try running "mt blocksize 0" to enable variable-length blocks. I think >>> ancient QIC tape drives are the only ones that require a fixed >>> blocksize. >>> >>> -- >>> Dan Nelson >>> dnelson@allantgroup.com >>> > > Hello. > I tried this, also, but with a similar effect. It think the HP SureStore 40x6i > (DDS-4) isn't a ancient tape drive, the PC-recommended and factory default > setting for this expensive DAT autoloader is 1024 bytes per block. > > I switched via mt blocksize 0 to variable blocksize, but then writing to > the tape took much longer. There are other DDS-4 drives that have a fixed block size of 1024 bytes. I have a Sony drive which also requires it. But why don't you just supply the data in that format? What are you writing? Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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