Date: 27 Aug 2003 21:27:16 +0200 From: Kern Sibbald <kern@sibbald.com> To: Dan Langille <dan@langille.org> Cc: freebsd-scsi@freebsd.org Subject: Re: (Fwd) Re: SCSI tape data loss Message-ID: <1062012436.1258.367.camel@rufus> In-Reply-To: <3F4CBD13.545.1FF6190E@localhost> References: <1061995529.1258.273.camel@rufus> <3F4CBD13.545.1FF6190E@localhost>
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[-- Attachment #1 --] Hello Dan, On Wed, 2003-08-27 at 20:15, Dan Langille wrote: > On 27 Aug 2003 at 11:06, Nate Lawson wrote: > > > On Wed, 27 Aug 2003, Kern Sibbald wrote: > > > Many thanks for testing this ... > > > > > > It seems to me that your tests, clearly indicate that > > > there is a problem even though you had no data loss. > > > > > > When you ran without -pthread, the status > > > received by the program was a 0 with 141776 > > > blocks written. This is correct. > > > > > > When you ran with -pthread, the status > > > received by the program was a -1 with 142879 > > > blocks written. This is "not correct". > > > > > > To me, that shows very clearly that with -pthread > > > the 0 status was lost and more blocks were written. > > > In fact, in this case so many blocks were written > > > that the tape was not properly terminated with > > > an EOF (actually two EOF marks). > > > > Here is a response I got by forwarding this to the pthreads maintainer: > > > A return status of 0 from write is not interpreted as an End-Of-Tape. > > > The threads library isn't smart enough to know that the file > > > is a tape device and that a 0 status should break it out of the > > > loop. Thus, it continues writing. > > > > > > Use libkse :-) > > > > > > -- > > > Dan Eischen > > Nate: thanks for getting in touch with him. > > It is interesting to note that the code works OK on Linux and > Solaris. Why is FreeBSD different in this case? > > Kern: I can't comment on libkse. I don't know it and I don't know > what effect it would have on Bacula. I cannot comment on libkse either since I don't know what it is, and it is not indexed in the FreeBSD man pages -- at least not under libkse. Best regards, Kern [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQA/TQYUNgfoSvWqwEgRAuEQAKCSFP+1EBD7jtXKQHnEGDLpJP85hwCeL6F/ LkM8JJWDnl6vW2zc2A9EG74= =huqD -----END PGP SIGNATURE-----
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