Red Hat GFS 6.0 -, Administrator'S Manual

Page: 101 / 192

Chapter 8. Using Clustering and Locking Systems 87
Caution
Shutting down one of multiple redundant LOCK_GULM servers may result in suspension of cluster
operation if the remaining number of servers is half or less of the total number of servers listed in the
cluster.ccs file
(
cluster.ccs:lock_gulm/servers
).
8.2.5.1. Usage
gulm_tool shutdown IPAddress
IPAddress
Specifies the IP address or hostname of the node running the instance of
lock_gulmd
to be
terminated.
8.3. LOCK_NOLOCK
The LOCK_NOLOCK system allows GFS to be used as a local file system on a single node.
The kernel module for a GFS/LOCK_NOLOCK node is
lock_nolock.o
. The lock protocol as spec-
ified when creating a GFS/LOCK_NOLOCK file system is called
lock_nolock
(lower case, with no
.o
extension).
Caution
Do not allow multiple nodes to mount the same file system while LOCK_NOLOCK is used. Doing so
causes one or more nodes to panic their kernels, and may cause file system corruption.