On Thu, Feb 19, 2004 at 09:00:03PM -0800, Randy Rubins wrote: > Thanks, Heinz! > > I got impatient this morning and executed: > dd if=/dev/zero of=/dev/sdb bs=1 count=1 > > hoping the result would be that /dev/sdb1 would > contain the only valid VG descriptor, and it worked. > > Just for confirmation, > > 1) Does VG always get written at the beginning of PE > (first 128 bytes), whether it's the whole disk > (/dev/sdb) or a partition (/dev/sdb1)? The LVM1 metadata starts at the very beginning of the device used as a PV. If you use the whole disk /dev/sdb (which you did before) it starts at the frist sector of thw disk, with /dev/sdb1 at the first sector of that partition. > > 2) I was expecting kickstart to clear the disk label, > but looking at my ks.cfg I only see > clearpart --all > It probably should have said: > clearpart --all --initlabel > to avoid the situation of having an "old" PV structure > info on /dev/sdb... I haven't tried it yet but would > that have been the right approach? Yes. > > 3) AJ Lewis's LVM-HOWTO contains a statement: > "The recommended method of partitioning a disk is to > create a single partition that covers the whole disk. > This avoids any nasty accidents with whole disk drive > device nodes and prevents the kernel warning about > unknown partition types at boot-up." > > Is there a general agreement amongst lvm developers > and users that the partition based PE (/dev/sdb1) is > preferred over the "partitionless" PE (/dev/sdb) in a > "normal" production environment when the intent is to > use the entire physical disk as a PE? It is the recommended approach to avoid the mentioned hassle. Using one partition which covers the whole disk does only waste a tiny amount of space vs. the whole disk PV _but_ makes the PV *visible* in the partitioning tools. Regards, Heinz -- The LVM Guy -- > > Cheers, > Randy > > -------------------------------------------------------------------------------- > > From: Heinz Mauelshagen <mauelshagen redhat com> > To: linux-lvm redhat com > Subject: Re: inactive PV associated to > unknown VG > Date: Thu Feb 19 10:38:31 2004 > > -------------------------------------------------------------------------------- > > Randy, > > the PV structure on /dev/sdb hasn't been removed. > Overwrite the first 128 bytes of /dev/sdb and rerun > vgscan. > > > On Wed, Feb 18, 2004 at 03:56:56PM -0800, Randy Rubins > wrote: > > I'm having a problem importing a VG after > > re-installing the server (original OS version RH > 7.3, > > new RHEL 3 AS). LVM is picking up the /dev/sdb, as > > well as the new /dev/sdb1 PV. Any way to tell LVM > to > > ignore /dev/sdb and force it to use /dev/sdb1? > > BTW, the LVM version used on RH 7.3 was 0.9.1_beta7, > > the new LVM version - whatever comes with RHEL 3 AS > > update 1. > > 1.0.3 > > > > > Thanks, > > Randy > > > > pvscan -- reading all physical volumes (this may > take > > a while...) > > pvscan -- ACTIVE PV "/dev/sda2" of VG "rootvg" > > [16.45 GB / 4.69 GB free] > > pvscan -- inactive PV "/dev/sdb" is associated to > > unknown VG "localvg" (run vgscan) > > pvscan -- inactive PV "/dev/sdb1" is associated to > > unknown VG "localvg" (run vgscan) > > pvscan -- total: 3 [45.42 GB] / in use: 3 [45.42 GB] > / > > in no VG: 0 [0] > > > > ===== > > Randy Rubins (eBay ID: lv_hockey) > > mailto://lv_hockey yahoo com > > > > __________________________________ > > Do you Yahoo!? > > Yahoo! Mail SpamGuard - Read only the mail you want. > > http://antispam.yahoo.com/tools > > > > _______________________________________________ > > linux-lvm mailing list > > linux-lvm redhat com > > https://www.redhat.com/mailman/listinfo/linux-lvm > > read the LVM HOW-TO at > http://tldp.org/HOWTO/LVM-HOWTO/ > > -- > > Regards, > Heinz -- The LVM Guy -- > > *** Software bugs are stupid. > Nevertheless it needs not so stupid people to > solve them *** > ===== > Randy Rubins (eBay ID: lv_hockey) > mailto://lv_hockey@yahoo.com > > __________________________________ > Do you Yahoo!? > Yahoo! Mail SpamGuard - Read only the mail you want. > http://antispam.yahoo.com/tools > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ *** Software bugs are stupid. Nevertheless it needs not so stupid people to solve them *** =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Red Hat GmbH Consulting Development Engineer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@RedHat.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
