Using Serviceguard Extension for RAC, 3rd Edition, May 2006

Serviceguard Configuration for Oracle 9i RAC
Creating a Storage Infrastructure with LVM
Chapter 3116
If Oracle performs the resilvering of RAC data files that are mirrored
logical volumes, choose a mirror consistency policy of “NONE” by
disabling both mirror write caching and mirror consistency recovery.
With a mirror consistency policy of “NONE”, SLVM does not
perform the resynchronization.
NOTE Contact Oracle to determine if your version of Oracle RAC allows
“resilvering” and to appropriately configure the mirror consistency
recovery policy for your logical volumes.
Create logical volumes for use as Oracle data files by using the same
options as in the following example:
# lvcreate -m 1 -M n -c n -s g -n system.dbf -L 408 /dev/vg_ops
The -m 1 option specifies single mirroring; the -M n option ensures that
mirror write cache recovery is set off; the -c n means that mirror
consistency recovery is disabled; the -s g means that mirroring is
PVG-strict, that is, it occurs between different physical volume groups;
the -n system.dbf option lets you specify the name of the logical
volume; and the -L 408 option allocates 408 megabytes.
If the command is successful, the system will display messages like the
following:
Logical volume “/dev/vg_ops/system.dbf” has been successfully
created
with character device “/dev/vg_ops/rsystem.dbf”
Logical volume “/dev/vg_ops/system.dbf” has been successfully
extended
Note that the character device file name (also called the raw logical
volume name) is used by the Oracle DBA in building the OPS database.
Creating RAC Volume Groups on Disk Arrays
The procedure described in this section assumes that you are using
RAID-protected disk arrays and LVM’s physical volume links (PV links)
to define redundant data paths from each node in the cluster to every
logical unit on the array.
On your disk arrays, you should use redundant I/O channels from each
node, connecting them to separate controllers on the array. Then you can
define alternate links to the LUNs or logical disks you have defined on