Swapping the server in ASM.

Hi All
We are going to upgrade our sun servers from v40z to x4600.We are using ASM for our database.
We are doing the server migration on our test system.
We are copying the binaries from old server to new server all other associated files /var/opt/oracle* etc and attached the storage to new server.
After attaching storage.We are able to see 6 disks out of 8 disk in ASM instance on new server.
All the permisisons are set to oracle:dba 660 and still we are not able to see remaining 2 disks.
I tried setting asm_diskstring parameter also but no luck
Any idea what could be other reason for the disks not showing up in v$asm_disk?
Any help will be highly appreciated.
thansk
Mehtab

Is this RAC or Single Instance ?
what OS are you running (I assume Linux) are you using asmlib ?
If RAC is it the same 2 disks on all nodes ?
are the disks the first / last disks in the list or just the same 2 random disks
and you say the output from an ls -l /dev/sd* shows all permissions are OK ?
and the "SQL> SHOW PARAMETER diskstring" shows the correct disk string ?
and the number and deice name of the disks have not changed between the machine upgrades ?
Philip...

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