cannot open device

[Theodore Alexopulos]

Have you ever met in SAN environment if despite devie files are all fine you cannot actually open devices to write

[doug mielke]

In addition to the local settings, you can check the presentation on the SAN. They can be presented read only.

[Theodore Alexopulos]

I either cannot read IOCTL error.

[Tom Geudens]

Hi,
I don't want to state the obvious, but that is possible. For example the EMC Symmetrix box has what is called "VolumeLogix"-devices. After you connect the box to the SAN these devices are all you can see (you need to enter VolumeLogix definitions in order to see the other devices). These "VolumeLogix"-devices cannot be written on (not even Windows can do that ;-).
Your case might be something similar ? Or are you definitely sure that you are looking at real disk / tape devices ?

Regards,
Tom Geudens

[Theodore Alexopulos]

These seem to be real devices. The definitions of disks and tape come with "ioscan -f" for example:
disk 85 0/7/0/0.1.14.255.14.4.0 sdisk CLAIMED DEVICE
and device files are:
/dev/dsk/c14t4d0 /dev/rdsk/c14t4d0

I do
#pvcreate /dev/rdsk/c14t4d0
OK

#vgcreate /dev/vg4 /dev/dsk/c14t4d0
vgcreate: Couldn't open physical volume "/dev/dsk/c14t4d1":
Invalid argument

Same situation with tape from a utility I can open the device file /dev/2mnb but I cant read and I cant write