Date: Mon, 15 Jan 2001 08:34:04 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Jean-Francois Dockes <jean-francois.dockes@wanadoo.fr> Cc: Eric Lee Green <eric@estinc.com>, freebsd-scsi@FreeBSD.ORG Subject: Re: Why filemarks in sardpos? Message-ID: <Pine.BSF.4.21.0101150833040.21087-100000@beppo.feral.com> In-Reply-To: <14946.48266.332620.887204@hautmedoc.dockes.com>
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Okay. You're porting and NDMP server? Good! Will you make it publicly available? On Mon, 15 Jan 2001, Jean-Francois Dockes wrote: > Matthew Jacob writes: > > [cut] > > So, all other things being equal, "First Block Value" should be > > good enough if one assumes that blocks Z..A get flushed to tape. > > > > ... > > Anyone else out there have an opinion on this? > > ... > > Funny, I was just working with sa last week for the purpose of porting some > NDMP backup tape server code. I had trouble with how 'sa' maintains the > current tape position (I submitted a few PRs), and I wondered if I could > use MTIOCRDSPOS instead, but I was prevented to do this precisely by the > flush thing (I didn't even try to use MTIOCRDSPOS, as the code made it > clear that it was unusable for my purpose). > > So, yes, I have an opinion, and it is that no flush should be performed. In > practise, I think that only the 'First Block' value is useful for backup > software, and its signification is pretty clear. I guess that the comment > in the code about how the SCSI spec is vague relate to the 'Last block' > value, but I can't really understand what the 'Last Block' thing is good > for anyway. > > Jean-Francois Dockes > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-scsi" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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