Re: Partition LUNs for Oracle ASM
Date: Fri, 25 Jan 2013 21:21:14 +0100
Message-ID: <5102E93A.70500_at_gmail.com>
On 25/01/2013 19:24, Walker, Jed S wrote:
> Thanks for the document reference. It looks pretty much like what is in the Documentation. It doesn't clearly state whether LUNs should be partitioned or not, but I get the impression you can use them as is.
Hi,
OracleŽ Grid Infrastructure Installation Guide 11g Release 2 (11.2) for
Linux E22489-08 states the following:
3.3.1.4.2 Configuring Disk Devices to Use Oracle ASM Library Driver on
x86 Systems
To include devices in a disk group, you can specify either whole-drive
device
names or partition device names.
[...]
Note: _Oracle recommends that you create a single whole-disk
partition on each disk_.
The best practice document Rac11gR2OnLinux on MOS suggests to use asmlib and to partition the disks:
3.1.1. Partition the Shared Disks
- Once the LUNs have been presented from the SAN to ALL servers in the cluster, partition the LUNs from one node only, run fdisk to create a single whole-disk partition with exactly 1 MB offset on each LUN to be used as ASM Disk.
Once I tried to use non-partitioned LUNs on Linux using multipath with device mapper and the installation went smoothly. It was just a quick test though, I don't have such a configuration in production.
That said, a very simple method to achieve partition alignment is to
completely avoid partitioning
(see http://www.fhgfs.com/wiki/wikka.php?wakka=PartitionAlignment).
Regards
Dimitre
-- http://www.freelists.org/webpage/oracle-lReceived on Fri Jan 25 2013 - 21:21:14 CET