Avamar: Garbage collection fails with MSG_ERR_DUPLICATE

Avamar garbage collection fails with the following error: 

Last GC: finished Fri May 22 12:25:36 2015 after 52m 16s >> recovered 0.00 KB (MSG_ERR_DUPLICATE) 

Garbage collection was started more than once within a short time.

This can be verified by sending the output of theGC maintenance logs to a file and reviewing the contents:

dumpmaintlogs --types=gc --days=5 > gc-maint.log.`date +%y%m%d`

The following maintenance log extract shows a second garbage collection job issued within 15 minutes of an existing job:

2015/05/22-08:38:20.80007 {0.3} <4200> starting garbage collection  <-- Manually started GC 
2015/05/22-08:38:20.80361 {0.3} <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
2015/05/22-08:38:20.80362 {0.3} <gcflags gccount="0" gcmincount="0" kill="0" limitadjust="0" maxpass="100" maxtime="3600" refcheck="true" throttlelevel="0" usehistory="false" orphansfirst="false"/>
2015/05/22-08:53:41.40871 {0.1} <4200> starting scheduled garbage collection  <-- Regular scheduled GC
2015/05/22-08:53:41.41290 {0.1} <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
2015/05/22-08:53:41.41290 {0.1} <gcflags gccount="0" gcmincount="0" kill="0" limitadjust="5" maxpass="0" maxtime="20700" refcheck="true" throttlelevel="0" usehistory="false" orphansfirst="false"/>
2015/05/22-09:25:36.41769 {0.0} <4202> failed garbage collection with error MSG_ERR_DUPLICATE
2015/05/22-09:25:36.41826 {0.3} <4202> failed garbage collection with error MSG_ERR_DUPLICATE
2015/05/22-09:25:36.92242 {0.6} <4202> failed garbage collection with error MSG_ERR_DUPLICATE
2015/05/22-09:25:37.00909 {0.1} <4202> failed garbage collection with error MSG_ERR_DUPLICATE

Do not attempt to run garbage collection manually.

Allow garbage collection to run as scheduled by the maintenance scheduler.
 

For more information, see Avamar: About the use of manual Garbage Collection. 
 

For further questions, training and troubleshooting of documented Avamar Capacity issues, see Avamar Capacity Troubleshooting, Issues, and Questions - All Capacity (Resolution Path).