ipcs -m showing different permissions on 2 nodes

[Adam Noble]

All,

Hope somebody can assist. I have a cluster with an oracle service group. When Oracle comes up on one node an ipcs -m (shared mem)shows the permissions for oracle as being 540 yet on the second node they are 500. Its strange becuase I believe the environments are identical as you would imagine. What is actually setting these permissions.

Any help appreciated.

[Massimo Bianchi]

Hi,
is there any
/etc/privgroup

file ?

Also,
check the group membership on the two nodes, maybe there are some sifferencies:


su - oracle -c id

Output should match.

HTH,
Massimo

[Adam Noble]

no privgroup file and they do match!

[Fred Ruffet]

ipc mode is defined upon creation by shmget (or whatever other call is used).

What version of Oracle here ? Is this RAC ?

Regards,

Fred

[Adam Noble]

We are using 9.2.0.5 and not rack, I'm unsure how this effects anything. I can't understand how but this must relate in someway to the server.

[Fred Ruffet]

I have many 9.2.0.4 and 9.2.0.3 here and all have 666 (rw-rw-rw-) rights.

Regards,

Fred

[Massimo Bianchi]

Just an idea.


From "man shmget":

+ shm_perm.cuid, shm_perm.uid, shm_perm.cgid, and shm_perm.gid
are set equal to the effective user ID and effective group ID,
respectively, of the calling process.

+ shm_perm.cuid, the low-order 9 bits of shm_perm.mode are set
equal to the low-order 9 bits of shmflg. shm_segsz is set
equal to the value of size.

+ shm_lpid, shm_nattch, shm_atime, and shm_dtime are set equal
to 0.

+ shm_ctime is set equal to the current time.




What are the umask for the two oracle and two root users ?

HTH,
Massimo

[Fred Ruffet]

I thought about it Massimo ;-) I've verified, and I have all my "ipcs -m" giving 666 mode whereas my umask vary from 002 to 027 depending on servers. So I don't think it matter. But maybe Adam's version is different (even if it is also a 9iR2)

Regards,

Fred