Date: Thu, 25 Oct 2007 02:27:48 +0100 From: RW <fbsd06@mlists.homeunix.com> To: freebsd-questions@freebsd.org Subject: Re: Can't overwrite a particular swap partition Message-ID: <20071025022748.417d8c37@gumby.homeunix.com.> In-Reply-To: <471FE5B8.8080806@cran.org.uk> References: <20071025005103.29d5040c@gumby.homeunix.com.> <471FE5B8.8080806@cran.org.uk>
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On Thu, 25 Oct 2007 01:39:20 +0100 Bruce Cran <bruce@cran.org.uk> wrote: > RW wrote: > > I have two swap partitions, ad4s1b is part of my main slice, and > > ad6s1b is on a second drive. The permissions are the same, but I > > can't overwrite the second one. The same thing happens whether I > > use swapoff or reboot into single user mode. > > > > What's the difference? > > > > # dd if=/dev/random of=/dev/ad4s1b bs=1m > > dd: /dev/ad4s1b: end of device > > 4097+0 records in > > 4096+0 records out > > 4294967296 bytes transferred in 245.745739 secs (17477281 bytes/sec) > > > > # dd if=/dev/random of=/dev/ad6s1b bs=1m > > dd: /dev/ad6s1b: Operation not permitted > > 1+0 records in > > 0+0 records out > > 0 bytes transferred in 0.053829 secs (0 bytes/sec) > > > > # ls -l /dev/ad*1b > > crw-r----- 1 root operator 0, 125 Oct 25 00:25 /dev/ad4s1b > > crw-r----- 1 root operator 0, 132 Oct 24 20:23 /dev/ad6s1b > > > > This looks like a geom permission problem, though it sounds like it > should't be occurring. Does setting > > kern.geom.debugflags=16 > > solve this? Not unless it needs a reboot. # sysctl kern.geom.debugflags=16 kern.geom.debugflags: 0 -> 16 gumby# dd if=/dev/zero of=/dev/ad6s1b bs=1m dd: /dev/ad6s1b: Operation not permitted 1+0 records in 0+0 records out 0 bytes transferred in 0.001970 secs (0 bytes/sec)
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