Date: Sun, 31 Jul 2005 18:32:09 +0200 From: "Julian H. Stacey" <jhs@flat.berklix.net> To: Frank Mancuso <dualxeon@gmail.com> Cc: freebsd-scsi@freebsd.org Subject: Re: scsi tape drive slow in freebsd Message-ID: <200507311632.j6VGW9OM054232@fire.jhs.private> In-Reply-To: Message from Frank Mancuso <dualxeon@gmail.com> of "Sun, 31 Jul 2005 11:43:24 EDT." <a9ef3f905073108434525dab4@mail.gmail.com>
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Frank Mancuso wrote: > hello there I have a scsi tape drive which is made by seagate python. > It is a scsi 2. normally in linux or windows it takes about 2 hours > and 30 mins to restore or backup. I just installed freebsd 4.11 and I > started to restore and it has been running for more then 10 hours .. > > this is my dmesg > > ahc0: port 0xe800-0xe8ff mem 0xe1811000-0xe1811fff irq 11 at device 12.0 on pci0 > aic7860: Ultra Single Channel A, SCSI Id=7, 3/253 SCBs > Waiting 15 seconds for SCSI devices to settle > sa0: Removable Sequential Access SCSI-2 device > > I had to recompile the kernel to support my dual P3 I was wondering if > maybe I had to add something in the kernel to speed this up.. > > thanks. perhaps mt blocksize 512 or mt blocksize 0 I used to see vast slow down if reader wasnt reading how how the writer wrote it. Also think blocking with tar if that's what your using eg -b 10k or 60k or whatever Your ear should tell you if it's streaming or stop starting. Ref man mt -- Julian Stacey Consultant Systems Engineer, Munich. http://berklix.com Mail in Ascii (Html = Spam). Ihr Rauch = mein allergischer Kopfschmerz.
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