Как идеологически правильно выдернуть винт из raid1?
lvm> vgreduce vg0 /dev/sdb1
Physical volume "/dev/sdb1" still in use
lvm> lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lvol0 vg0 rwi-aor--- 140.00g 100.00

swap0 vg0 rwc-aor--- 4.00g 100.00

lvm> lvconvert --replace /dev/sdb1 vg0/swap0
Insufficient suitable contiguous allocatable extents for logical volume : 1025 more required
Failed to allocate replacement images for vg0/swap0