Can anyone confirm that filelocking is active on all AIX JFS
filesystems by default (ignoring anything in connection with NFS)? As
some *inx falvors don't have filelocking on filesystems like /var/tmp


Thanks

yes, inode locking is on for all jfs filesystems. jfs2 uses a different
locking model, but its still there.



for 5.1



echo clk | kdb | grep jfs

jfs_comp_lock Available

jfs_icache_lock Available

jfs_quota_hash_lock Available

jfs_quota_lock Available

jfs_sync_lock Available



for 4.3



echo locks | crash | grep jfs

> jfs_quota_lock: 0x015863f0: Available

jfs_icache_lock: 0x0026f3e8: Available

jfs_sync_lock: 0x0026f3b4: Available

jfs_comp_lock: 0x0026f580: Available



http://www.redbooks.ibm.com/redpapers/pdfs/redp0102.pdf



Rgds

Mark


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