Block device permissions

Hi everyone,

the Red Hat support wasn't much help so far, but perhaps you can help me:

After updating a few RHEL machines from 5.3 to 5.4 only root can access the lvm devices under /dev/mapper:

RHEL5-4 ~ # ll /dev/mapper/
total 0
crw------- 1 root root 10, 62 Sep 29 15:18 control
brw------- 1 root root 253, 0 Sep 29 15:18 vg_root-lv_root
brw------- 1 root root 253, 1 Sep 29 15:18 vg_root-lv_var

Before the update the permissions for the device files were 660 and the group was "disk" (default RHEL behaviour - I never configured this explicitly). Can anybody give me a hint about how to enable this behaviour again. I thought it had something to do with some changed udev rules, but even under RHEL 5.3 "udevinfo -q all -n /dev/mapper/vg_root-lv_root" just gives me "no record for 'mapper/vg_root-lv_root' in database", so I think udev has nothing to do with it. I think the device-mapper should change these permissions, but I'm not sure about this...

Thanks in advance for any advice on this.

Best Regards,
René Schaffrath

PS: Yes I know, I could simply add 2 lines in /etc/rc.local or some other place, but this won't help me, if I ever activated / created a logical volume on a running system. For several reasons I definitely need the behaviour of pre 5.4 versions.

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