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Anonymous committed 4d88bc8

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contrib/pg_upgrade/server.c

 	 *
 	 * Turn off durability requirements to improve object creation speed, and
 	 * we only modify the new cluster, so only use it there.  If there is a
-	 * crash, the new cluster has to be recreated anyway.
+	 * crash, the new cluster has to be recreated anyway.  fsync=off is a big
+	 * win on ext4.
 	 */
 	snprintf(cmd, sizeof(cmd),
 			 "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d%s%s%s%s\" start",