Monitoring the deduplication rate

The deduplication rate is the percentage of data that was stored already. That data is not stored again.

NetBackup reports the rate of deduplication as follows:

The Deduplication Rate column of the Activity Monitor Jobs tab.

See Using the Activity Monitor.
The Job Details dialog box.

The Detailed Status tab shows detailed information, including the deduplication rate.
The information depends on whether it is media server deduplication or client-side deduplication, as follows:
- For media server deduplication, the Detailed Status tab shows the deduplication rate on the server that performed the deduplication. The following job details excerpt shows details for a client for which Server_A deduplicated the data (the dedup field shows the deduplication rate):
```
10/6/2010 10:02:09 AM - Info Server_A(pid=30695) 
  StorageServer=PureDisk:Server_A; Report=PDDO Stats 
  for (Server_A):   scanned: 30126998 KB, stream rate: 
  162.54 MB/sec, CR sent: 1720293 KB, dedup: 94.3%, cache 
  hits: 214717 (94.0%)
```
  The other fields that show deduplication information are highlighted in the example. For the field descriptions, see Table: Deduplication activity field descriptions.
- For client-side deduplication jobs, the Detailed Status tab shows two deduplication rates. The first deduplication rate is always for the client data. The second duplication rate is for the disk image header and True Image Restore information (if applicable). That information is always deduplicated on a server; typically, deduplication rates for that information are zero or very low. The following job details example excerpt shows the two rates:
```
10/8/2010 11:54:21 PM - Info Server_A(pid=2220) 
  Using OpenStorage client direct to backup from client 
  Client_B to Server_A  
10/8/2009 11:58:09 PM - Info Server_A(pid=2220) 
  StorageServer=PureDisk:Server_A; Report=PDDO Stats for 
  (Server_A): scanned: 3423425 KB, stream rate: 200.77 
  MB/sec, CR sent: 122280 KB, dedup: 96.4%, cache hits: 
  49672 (98.2%)
10/8/2010 11:58:09 PM - Info Server_A(pid=2220) Using 
  the media server to write NBU data for backup 
  Client_B_1254987197 to Server_A
10/8/2010 11:58:19 PM - Info Server_A(pid=2220) 
  StorageServer=PureDisk:Server_A; Report=PDDO Stats 
  for (Server_A): scanned: 17161 KB, stream rate: 1047.42 
  MB/sec, CR sent: 17170 KB, dedup: 0.0%, cache hits: 0 (0.0%)
the requested operation was successfully completed(0)
```
  See Viewing job details.
  
  See Job Detail descriptions.

Table: Deduplication activity field descriptions

Field	Description
`cache hits`	The percentage of time that the local fingerprint cache contained a record of the segment. The deduplication plug-in did not have to query the database about the segment.
`CR sent`	The amount of data that is sent from the deduplication plug-in to the component that stores the data. (In NetBackup, the NetBackup Deduplication Engine stores the data. In PureDisk, a content router stores the data.) If the storage server deduplicates the data, it does not travel over the network. The deduplicated data travels over the network when the deduplication plug-in runs on a computer other than the storage server, as follows: On a NetBackup client that deduplicates its own data (client-side deduplication). On a fingerprinting media server that deduplicates the data. The plug-in on the fingerprinting server sends the data to the storage server, which writes it to a Media Server Deduplication Pool. On a media server that then sends it to a PureDisk environment for storage. (In NetBackup, a PureDisk Storage Pool represents the storage of a PureDisk environment.)
`dedup`	The percentage of data that was stored already. That data is not stored again.
`scanned`	The amount of data that the deduplication plug-in scanned.
`stream rate`	The speed of the scan: The kilobytes of data that are scanned divided by how long the scan takes.