From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 12 Sep 2001 09:40:47 +0000 From: Tomas Edwardsson Subject: Re: [linux-lvm] Re: Problem with vgscan "only found 626 of 625 LEs for LV" Message-ID: <20010912094047.A19059@hp.is> References: <20010911112241.A16588@hp.is> <20010911113054.B16588@hp.is> <20010911104934.C29347@turbolinux.com> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: <20010911104934.C29347@turbolinux.com>; from adilger@turbolabs.com on Tue, Sep 11, 2001 at 10:49:34AM -0600 Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-lvm@sistina.com Well, problem number 1. vgscan fails and therefore vgchange does also. ]# ll -d /dev/vg00 ls: /dev/vg00: No such file or directory I ran the rest of the commands just the same since we have a backup. After I did that it seems all LV and LE info has evaporated. Current pvdata is http://vefur.hp.is/lvm/pvdata-hdd1-new.txt Thanks, Tommi On Tue, Sep 11, 2001 at 10:49:34AM -0600, Andreas Dilger wrote: > On Sep 11, 2001 11:30 +0000, Tomas Edwardsson wrote: > > I had already tried the vgcfgrestore, it didn't seem to help but I discovered > > that the UUID for one of my PVs was missing so I ran the uuid-fixer and now > > they all have UUIDs again (don't know if that is relevant). > > > > I have run the pvdata on all my PVs although I think the right one is the > > following file run with pvdata -avP /dev/hdd1: > > http://vefur.hp.is/lvm/pvdata-hdd1.txt > > Yes, this clearly shows that lvol1 has 625 LEs (in the LV data), but it > has PE 0-625 from that PV assigned to it (total of 626 PEs). I don't > know which one is correct, nor how it got that way. If you have a > filesystem on that LV, you could find out how big the fs is to figure > out which value needs fixing. For ext2, you can do: > > dumpe2fs -h /dev/vg00/lvol1 > > and figure out if it is 2500MB (625 LE) or 2504MB (626LE). Then (the fun > part) you need to go and edit either the LV table or the PE table to have > the right numbers in it. I'm guessing the LV table is wrong (and even if > not, it is safer to add the PE to the end than to truncate your filesystem). > > dd if=/dev/hdd1 of=/hdd.sav bs=1024 count=188 # backup LVM metadata > dd if=/dev/hdd1 of=/lv1.dat bs=1 skip=43008 count=328 # get lvol1 metadata > od -Ad -tx1 /lv1.dat # show lvol1 metadata > > # 625 = 0x271 which you should see at offset 300, 301 of the LV struct > # 626 = 0x272 = 0x02 0x72, 0x72 = "r" in ASCII, so we write this into LV > echo "r" | dd of=/lv1.dat count=1 seek=300 # write 0x72 to LE count > > od -Ad -tx1 /lv1.dat # show lvol1 metadata > # we should now see 0x72 0x02 0x00 0x00 at offset 300 of the LV metadata > > dd if=/lv1.dat of=/dev/hdd1 bs=1 seek=43008 # write LV meta to disk > pvdata -avP /dev/hdd1 # verify all is well > vgscan # should be OK now > > Cheers, Andreas > -- > Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, > \ would they cancel out, leaving him still hungry?" > http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html