<html><head><style type="text/css"></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><div>Hi, Let me try to explain my issue with gfs/gfs2 filesystem. I have two node cluster and a shared gfs filesystem which is mounted on both the nodes at the same time. I can access the filesystem from both nodes. 1. From node A I put a lock on a file called testfile and tried to put the lock on testfile from node B. I get message, file is already locked, which is good since file is locked from ndoe A. 2. Now unmount the filesystem on node B while lock is still there on testfile from node A and mount it back. Now try to put lock on the testfile from node B which is locked from node A. Expected result would be not to succeed in puting lock from node B, but "NO" I am able to put the lock from node B. 3. Node B does not know that there is some lock on testfile form node A but now if you release the lock from node A and put it again and then try to put lock on testfile from node B it works as expected means you will not be able to put lock on testfile. It says file is already locked. It does not make any difference if I use gfs or gfs2 test works same way I tried on Oracle enterprise linux 5.1 and 5.2, which is nothing but redhat. Also node A or node B test results are same. I have lock file which is compiled one but the following program also works the same way. =========================================================================== /* ** lockdemo.c -- shows off your system's file locking. Rated R. */ #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <fcntl.h> #include <unistd.h> int main(int argc, char *argv[]) { /* l_type l_whence l_start l_len l_pid */ struct flock fl = { F_WRLCK, SEEK_SET, 0, 0, 0 }; int fd; fl.l_pid = getpid(); if (argc > 1) fl.l_type = F_RDLCK; if ((fd = open("lockdemo.c", O_RDWR)) == -1) { perror("open"); exit(1); } printf("Press <RETURN> to try to get lock: "); getchar(); printf("Trying to get lock..."); if (fcntl(fd, F_SETLKW, &fl) == -1) { perror("fcntl"); exit(1); } printf("got lock\n"); printf("Press <RETURN> to release lock: "); getchar(); fl.l_type = F_UNLCK; /* set to unlock same region */ if (fcntl(fd, F_SETLK, &fl) == -1) { perror("fcntl"); exit(1); } printf("Unlocked.\n"); close(fd); } ============================================================================= I will be happy to provide more details as requested. TIA vip </div></div> </body></html>