LVM求助

PV由/dev/sda7,/dev/sda8组成,
Win XP下不小心删除了/dev/sda8,
pvscan
Couldn't find device with uuid 'oH6dBS-S0MR-37hH-lExo-d1QZ-Jp1V-Zfv1WT'.
PV /dev/sda7 VG rootvg lvm2 [74.51 GB / 46.01 GB free]
PV unknown device VG rootvg lvm2 [80.00 GB / 10.00 GB free]

lvscan
Couldn't find device with uuid 'oH6dBS-S0MR-37hH-lExo-d1QZ-Jp1V-Zfv1WT'.
ACTIVE '/dev/rootvg/swap' [512.00 MB] inherit
inactive '/dev/rootvg/data' [70.00 GB] inherit
ACTIVE '/dev/rootvg/usr' [10.00 GB] inherit
ACTIVE '/dev/rootvg/var' [3.00 GB] inherit
ACTIVE '/dev/rootvg/home' [4.00 GB] inherit
ACTIVE '/dev/rootvg/gentoo' [1.00 GB] inherit
ACTIVE '/dev/rootvg/download' [10.00 GB] inherit
其中data是加入了/dev/sda8后再生成的.
问题:
1.能否恢复/dev/sda8
2.如果不能恢复，LVM中如何清除垃圾信息？
谢谢！