Date: Thu, 25 Jan 1996 20:10:35 -0500 From: Glen Foster <gfoster@gfoster.com> To: stesin@elvisti.kiev.ua Cc: doc@freebsd.org Subject: Re: Frustrated....doc@freebsd.org Message-ID: <199601260110.UAA16868@nomad.osmre.gov> In-Reply-To: <199601251556.RAA00921@office.elvisti.kiev.ua> (stesin@elvisti.kiev.ua)
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> From: "Andrew V. Stesin" <stesin@elvisti.kiev.ua> > Date: Thu, 25 Jan 1996 17:56:17 +0200 (EET) > > What's interesting: while sd1 was a fresh-formatted disk, > dd worked Ok, I made an initial copy of rsd0c to rsd1c > easily (fast!). But now I can't dd my rsd0a to rsd1a -- dd fails > telling me that rsd1a is read-only file system. ??? > rsd0e to rsd1e works fine! A day of beating and RTFMing > with zero result. But this belongs to questions@freebsd.org, > I'll ask there later... or learn how to "dump (1)", at last :) I found dd to be very slow, I didn't play with the bs parameters as I also ran into the "r/o" issue that you did once the part. had data on it. I find that a dump|restore pipe is much faster than dd plus the two partitions don't have to be identical. OTOH, the destination partition has to be mounted, like: # newfs /dev/rsd1h # mount /dev/sd1h /mnt # dump 0f - /dev/rsd0h | (cd /mnt ; restore rf -) # umount /mnt > Do you mean "partitions" to be fdisk partitions (those called > "slices"), or a BSD subpartitions with file systems? > I recall that there _is_ a limit on BSD subpartitions quantity > somewhere, though I'd never reached it :-) I meant "traditional" BSD (sub-)partitions whether living inside a slice or on the disk itself. These are limited to eight. Unfortunately, the sysinstall program enforces its own lower limit even though you have more than one disk and/or partition selected. I was told that there is documentation about this, perhaps in the sysinstall help files, but I haven't confirmed it myself. I like your solution for implementing a "hot spare" disk in the box, the only concerns I would have about that would be that added heat might shorten the life of both disks and that a power problem (e.g. lightning strike) could kill both disks at once.
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