Lock_Nolock - Red Hat GFS 6.0 Administrator's Manual

Chapter 8. Using Clustering and Locking Systems
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
8.2.5.1. Usage
gulm_tool shutdown IPAddress
IPAddress
Specifies the IP address or hostname of the node running the instance of
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
ified when creating a GFS/LOCK_NOLOCK file system is called
extension).
.o
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.
(
cluster.ccs:lock_gulm/servers
).
. The lock protocol as spec-
lock_nolock.o
lock_nolock
87
to be
lock_gulmd
(lower case, with no