Hi, All: I have downloaded "Programming Locking Applications" written by Christine Caulfield from http://sources.redhat.com/cluster/wiki/HomePage?action=AttachFile&do=view&target=rhdlmbook.pdf I read it through, especially the DLM locking model. It is very informative. Thanks Christine. Now I have some questions about the lock resource and wish to get answers from you. 1. Whether the kernel on each server/node is going to initialize a number of empty lock resources after completely rebooting the cluster? 2. If so, what is the default value of the number of empty lock resources? Is it configurable? 3. Whether the number of lock resources is fixed regardless the load of the server? 4. If not, how the number of lock resources will be expended under a heavy load? 5. The lock manager maintains a cluster-wide directory of the locations of the master copy of all the lock resources within the cluster and evenly divides the content of the directory across all nodes. How can I check the content held by a node (what command or API)? 6. If only one node A is busy while other nodes are idle all the time, does it mean that the node A holds a very big master copy of lock resources and other nodes have nothing? 7. For the above case, what would be the content of the cluster-wide directory? Only one entry as only the node A is really doing IO, or many entries and the number of entries is the same as the number of used lock resources on the node A? If the latter case is true, will the lock manager still divide the content evenly to other nodes? If so, would it costs the node A extra time on finding the location of the lock resources, which is just on itself, by messaging other nodes? If you need more information from me in order to help me, or if you think my questions are not clear, please kindly let me know. Thank you very much in advance and look forward to hearing from you. Jas ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
