[snip] > Couldn't find device with uuid 'WyCdOD-T3fq-r7gc-pFon-e3C1-Ay8n-EdGyEE'. Couldn't find all physical volumes for > volume group VolGroup00. [/snip] hey, hey, it is done, now! using pvcreate /dev/sdb1 -u WyCdOD-T3fq-r7gc-pFon-e3C1-Ay8n-EdGyEE i got it. I could then do vgextend VolGroup00 /dev/sdb1 it works. But, how can i get it into the default Logical volumes? Will i have to create a new one and mounting it? I read and read in the howto from tldp, but i don't find a real "easy" solution. How can i add my /dev/sdb to LogVol01? ACTIVE '/dev/VolGroup00/LogVol00' [8,06 GB] inherit <-- must be /dev/sda2 ACTIVE '/dev/VolGroup00/LogVol01' [256,00 MB] inherit <-- should be swap i would like to either include /dev/sdb1 oder create an new one. I personally found it a little bit confusing about stripes and extents, that is why i am asking. Sorry Roger