On Tue, Sep 10, 2002 at 11:56:16AM -0700, Anthony Johnson wrote: > I'm trying to find information on the availability factors of LVM. As I > understand it, a quorum is required for a volume group to be available. > I have some questions in this regard: > > 1) What defines a quorum - over 50% of the PVs in the VG, or over 50% > of the VGDAs? VG quorum is given in case all of its PVs are available. > 2) How many VGDAs are stored on each physical volume. From AIX > experience, this varied depending on the number of PVs in the VG. In the LVM1 metadata there's allways 1 VGDA on each PV which has internal redundancy. With the new LVM2 formats you can have as many VGDA copies as you like. > 3) If quorum is lost on an active VG, is the entire VG automatically > varied off? No, it will stay accessable with the exception of the dead PV(s). > 4) Can a VG without quorum be forcefully varied on? With LVM1.1 (see CVS; WARNING: his is interim development code!) and with final LVM2 later this year, you can activate a VG which has lost quorum. > 5) Can quorum checking be disabled? No, but with the above SW you can activate the VG in case there's at least 1 PV still accessable. > > Thanks, > Anthony > > _______________________________________________ > 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 -- Regards, Heinz -- The LVM Guy -- *** Software bugs are stupid. Nevertheless it needs not so stupid people to solve them *** =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Sistina Software Inc. Senior Consultant/Developer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ 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