I need to recover a PV from a disk with no partition table. I have a disk which gives EIO errors trying to read from the first few blocks of, so, no partition table. Is there any way with LVM2, given that I have the /etc/lvm/backup/<vgname> file that I can determine the offset into the disk where the partition starts, so that I could do: # losetup -o <offset> /dev/loop2 /dev/hde to get the PV on /dev/loop2 and then be able to activate it with vgchange and read it's LVs? gpart tells me: # losetup -o $((512*8)) /dev/loop2 /dev/hde # gpart -vg /dev/loop2 dev(/dev/loop2) mss(512) * Warning: strange partition table magic 0x0000. ... Begin scan... Possible partition(Linux ext2), size(19mb), offset(0mb) type: 131(0x83)(Linux ext2 filesystem) size: 19mb #s(39248) s(55-39302) chs: (1023/255/0)-(1023/255/0)d (0/0/0)-(0/0/0)r hex: 00 FF C0 FF 83 FF C0 FF 37 00 00 00 50 99 00 00 Possible partition(Linux LVM physical volume), size(156315mb), offset(19mb) type: 142(0x8E)(Linux LVM physical volume) size: 156315mb #s(320133744) s(39304-320173047) chs: (1023/255/0)-(1023/255/0)d (0/0/0)-(0/0/0)r hex: 00 FF C0 FF 8E FF C0 FF 88 99 00 00 70 DA 14 13 Which looks right, but: # losetup -o $((512*39304)) /dev/loop3 /dev/hde # vgscan Yields no new volume groups. Neither does the above with 512*39303 or 512*39305 so it doesn't seem to be an off-by-one. Nor does any of 512*(39303-8), 512*(39304-8), 512*(39305-8) to account for the fact that loop2 (which the gpart was done on originally) is 8 blocks into /dev/hde already. Am I missing something? Thanx, b. -- My other computer is your Microsoft Windows server. Brian J. Murrell
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