On Mon, Aug 27, 2012 at 11:42 AM, Warren Block <wbl...@wonkity.com> wrote: > On Mon, 27 Aug 2012, Matt Smith wrote: > >> On 2012-08-27 14:56, Warren Block wrote: >>> >>> >>> Stefan called it. The newfs is done on /dev/gpt/gptroot, no problem >>> there. But when glabel writes to /dev/ada0p2--which is >>> /dev/gpt/gptroot, same thing, it overwrites the last block. And then >>> the filesystem is mounted with the glabel device, which is actually >>> one block smaller than the filesystem expects. >>> >>> Could be either the filesystem or GEOM that's causing the failure at >>> shutdown. >>> >>> Happily, those glabels aren't accomplishing anything useful and can >>> be skipped. Removing the glabels and changing the devices in fstab >>> might be enough. A more cautious approach would be to back up, newfs, >>> skip the glabel step, and then change the devices in fstab. >> >> >> As I said on a previous mail I did boot it with a USB stick and cleared >> the glabel metadata and altered the fstab to point to both the GPT labels >> and the raw UFS device and I still get the issue. So am I right in thinking >> then that this has caused irreparable damage > > > To the filesystem? Probably (weasel word) not. The old instructions for > gmirror used the last block out of a filesystem and there have been no > notable reports of data loss. > > One thing to mention is that SU+J might change what the filesystem does with > that last block. I'm avoiding SU+J until the dump problem is fixed, so have > not experimented with that. > >> and the only way I can fix this now is to newfs the filesystem again, this >> time just using GPT labels and not using glabel at all? > > > I'll commit to it and say yes, that will work. > >> This is the first time I've ever done a manually partitioned installation >> with GPT and alignment, previously I've only ever used sysinstall with >> non-aligned MBR installations, so it was a bit of a learning curve. If I do >> have to newfs it again then I want to be sure that I'm doing the correct >> things so that I don't find myself with any other issues. So does the rest >> of what I did look fine? > > > No obvious problems jumped out at me. Here are my notes: > http://www.wonkity.com/~wblock/docs/html/disksetup.html > > The gpart version is halfway down. I really need to switch that around.
Pretty good page, but I would really suggest that you also do either 4k or 1M alignment on your partitions. If you don't and use a disk with 4K blocks (internally), you will have terrible performance. 1M is recommended by Microsoft and used by Windows, but seems a bit excessive to me. -- R. Kevin Oberman, Network Engineer E-mail: kob6...@gmail.com _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
