ok well dividing the raid array from scrach into to VG did the job, this is also what was adviced in open-e forum....

big thanks to Open-E, before closing the question i have one left regarding this issue.

i have 4 Physical disks, i wanted to create the first volume as 2 giga like recommended, (each disk is about 150 GB) , problem is , that when i selected 1 or more disk for the use of the first VG, i coudnt select the availble disk space that remained on this disk (which is quite alot) to the second VG where i put all the rest of the disk in raid 5.

this caused me alot of unused spaced to be vasted.

is it possibole to allocate 1 Physical disk in to more then one VG , how do i manage to create the first VG only in 2 GIGA capacity without lossing all the remanning disk space that i wanted to alocate from this disk to the second VG which defined as raid 5 array?

thanks.