Veritas NetBackup™ Deduplication Guide

MSDP media write error (84)

Table: Media write error causes describes solutions to the media write errors that may occur during Media Server Deduplication Pool backups, duplication, or replication.

Client-side deduplication can fail if the client cannot resolve the host name of the server. More specifically, the error can occur if the storage server was configured with a short name and the client tries to resolve a fully qualified domain name

To determine which name the client uses for the storage server, examine the deduplication host configuration file on the client.

See About the MSDP host configuration file.

To fix this problem, configure your network environment so that all permutations of the storage server name resolve.

Veritas recommends that you use fully qualified domain names.

See Use fully qualified domain names.

A duplication job to PureDisk storage may fail for a large number of small files. This failure may occur if the storage unit maximum fragment is at the default setting.

Messages similar to the following may appear in the NetBackup job details:

2/12/2013 2:33:20 AM - Critical bpdm(pid=25204) Storage Server Error:
 (Storage server: PureDisk: msdp.example.com) async_get_job_status: 
 Replication started but failed to complete successfully:  __process_batch:
 CRStoreDO failed: broken pipe, DO fingerprint d6f2521a5c66c54225ecd6a4c92. 
 Look at the replication logs on the source storage server for more
 information. V-454-105
2/12/2013 2:33:22 AM - Critical bpdm(pid=25204) sts_copy_extent failed: 
 error 2060014 operation aborted       
2/12/2013 2:33:22 AM - end writing; write time: 3:39:53
2/12/2013 2:33:39 AM - Error bpduplicate(pid=5300) host 
 msdp.example.com backup id msdp.example.com_1360303271 optimized 
 duplication failed, media write error (84). 
2/12/2013 2:33:39 AM - Info msdp.example.com(pid=25204) 
 StorageServer=PureDisk:msdp.example.com; Report=PDDO Stats for 
 (msdp.example.com): scanned: 0 KB, CR sent: 0 KB, CR sent over FC:
 0 KB, dedup: 0.0%, cache disabled
2/12/2013 2:33:40 AM - Error bpduplicate(pid=5300) Duplicate of backupid
 msdp.example.com_1360303271 failed, media write error (84).    
2/12/2013 2:33:40 AM - Error bpduplicate(pid=5300) Status = no images 
 were successfully processed.      
2/12/2013 2:33:40 AM - end Duplicate; elapsed time: 3:41:03 media write 
 error(84)

Messages similar to the following also may appear in a log file on the PureDisk content router that processed the duplication operation. The log file resides in a directory that corresponds to the connection to the content router for the duplication operation. The name of the directory is the NetBackup storage server IP address, and it resides in the /Storage/log/spoold directory on the content router.

spad/Store/2/266020624-1360833685.log:July 14 04:12:03 ERR [1081665856]:
25112: DO: DO 065ab494d80277148c559071d007bde1: DO record size of 
378652257 bytes is larger than the maximum allowed size of 335544320 
bytes: DO has too many segments
spad/Store/2/266020624-1360833685.log:February 14 04:12:03 ERR 
[1081665856]: 8413608: Store terminated due to a local processing 
error at: Sun Jul 14 04:12:03 2013

To resolve this problem, reduce the fragment size of the NetBackup storage unit that represents the PureDisk storage. Depending on the source storage content, you may have to reduce the fragment size significantly.