Date: Mon, 25 Oct 2004 20:46:24 -0400 From: John Von Essen <john@essenz.com> To: Doug Russell <drussell@saturn-tech.com> Cc: freebsd-hackers@freebsd.org Subject: Re: hacking SCO.... Message-ID: <76A94E35-26E8-11D9-839A-0003933DDCFA@essenz.com> In-Reply-To: <20041009044403.P39589-100000@mxb.saturn-tech.com> References: <20041009044403.P39589-100000@mxb.saturn-tech.com>
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This may be a dumb question, but if you make a cpio tape archive from data on an SCO system (HTFS filesystem), you can still restore the data off the tape to another system, like FreeBSD with a UFS filesystem, right? And the followup, can FreeBSD run SCO binaries (SCO Unix 5.0.1)? I am going to try and convert these people from their SCO box over to a FreeBSD system. Just want to make sure the data will come off the tape. -John On Oct 9, 2004, at 6:51 AM, Doug Russell wrote: > > On Fri, 8 Oct 2004, Sergey Babkin wrote: > >> Try to use the "Verify" menu from the Adaptec BIOS. It finds and tries >> to re-map the bad sectors (it tries to preserve data during this too, >> unless the sector is completely unreadable). > > The verify commands issued by the BIOS are virtually useless compared > to > the type of tests done my sformat. If you enable automatic read > re-allocation, it is almost the same as simply reading your whole disk > with dd. > >>> I do the full 14 pattern tests before I put a SCSI disk in service. >> >> When a disk starts losing blocks like this, usually they only multiply >> over time. The best thing you can do is replace the disk and >> move the data before you lost more of it. > > NO! Not necessarily! > > If a disk has simply grown a few new defects since it was new, it does > not > necessarily mean it is going to die. I have many disks that had minor > bad > spots on them that weren't even always found by the factory format > routines, or had appeared since (due to transport, debris in the HDA, > poor > holding power for the magnetic fields in some area, etc). If the drive > passes through a few full patern tests without problems and doesn't > continue to grow new defects, it is likely just fine. > > I've got all kinds of old SCSI disks that were 'discarded' due to > errors. > Only a couple are truly dead... the rest have been running for years > with > no problems after making a real grown defect list from the pattern > tests. > > This is something I learned many many years ago when running my old > Miniscribe 3650s on a Perstor high density controller. It formated the > drives to 31 sectors per track instead of 17. Hard on the disks, and > the > media, but a good drive, after being properly tested, would run > flawlessly > for years being hammered 24/7 on BBS machines. Got 78 megs per drive > instead of 42.whatever it was. :) > > Later...... <Doug> > > > John Von Essen (john@essenz.com) President, Essenz Consulting (www.essenz.com) Phone: (800) 248-1736 Fax: (800) 852-3387
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