I am using lvm-0.9.1_beta7-1 with TurboLinux6.5(2.2.19) over IBM mainframe S/390. I tried to pvcreate 200 dasds(disks) together, than I'll make them a vg, totally disk space around 500G. I can work with dasds whose major number is 94 (that is, 64 dasds in total)all right. However, I fails to pvcreate those dasds whose major number is 253, 252.... The message is: [root@host96 block]# pvcreate /dev/dasdb[st]1 pvcreate -- invalid physical volume name "/dev/dasdbs1" I traced lvm kernel source and found that in /usr/src/linux-2.2.19/include/linux/major.h, only dasd with major number 94 is defined. I think that's the reason pvcreate thought those dasds are invalid. Any Solutions?