LBUG(). If the object is 0-length, then we should use the existing
object. This will help to avoid a full fsck in most cases.
+Severity : enhancement
+Bugzilla : 13207
+Description: adapt the lustre_config script to support the upgrade case
+Details : Add "-u" option for lustre_config script to support upgrading 1.4
+ server targets to 1.6 in parallel.
+
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2007-08-10 Cluster File Systems, Inc. <info@clusterfs.com>