RE: ASM and RAW Devices on RHEL 4

One thing to be aware of (I got caught with this one just yesterday!) is the 50-udev.permissions file seems to be read from the bottom up. Either that or wildcards take precedence. I left the line in there that says

raw/*:root:disk:0660

Having lines like this below that line seem to just be ignored:

raw/raw12:crsha:oinstall:0644
raw/raw22:crsha:oinstall:0644
raw/raw42:crsha:oinstall:0644
raw/raw11:root:oinstall:0660
raw/raw21:root:oinstall:0660

You need to comment out the wildcard line (i.e. #raw/*:root:disk:0660) for it to work.

Note I did absolutely minimal testing to prove this. A reboot without the wildcard line commented out didn't change the permissions correctly, a reboot with the wildcard did. Maybe someone with more RH4 knowledge than me can say why this happens, I was just in a hurry to MAKE it happen. :)  

Pete  

"Controlling developers is like herding cats." Kevin Loney, Oracle DBA Handbook  

"Oh no, it's not. It's much harder than that!" Bruce Pihlamae, long-term Oracle DBA
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of johan Eriksson Sent: Wednesday, 8 March 2006 11:03 PM
To: Pete Sharman
Cc: bob_murching_at_budco.com; sanstorage_at_gmail.com; exriscer_at_gmail.com; Oracle-L Freelists Subject: RE: ASM and RAW Devices on RHEL 4

On Wed, 2006-03-08 at 06:30 +1100, Pete Sharman wrote:
> Are they disappearing completely or is the protection mapping the
> issue? In RH4 raw devices are remapped on startup so you need to edit
> he /etc/udev/permissions.d/50-udev.permissions file so that the OCR
> devices are set up as root:oinstall:660 and the voting devices
> <crs_kernel_owner>:oinstall:644 (or something like that, check the
> install guide for correct protections).
>
>

or adding something like this to /etc/rc.local (raw1 OCR and raw2 is voting), which I think is what the installation docs suggests.

chown root:oinstall /dev/raw/raw1
chmod 660 /dev/raw/raw1

chown oracle:oinstall /dev/raw/raw2
chmod 660 /dev/raw/raw2

chown oracle:oinstall /dev/sdb1
chown oracle:oinstall /dev/sdb2
chmod 660 /dev/sdb1
chmod 660 /dev/sdb2

But editing /etc/udev/permissions.d/50-udev.permissions is a more elegant solution I think (and new to me).

/johan

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