>> Team,

>> Sometime 2 drives acquire same tape, though there are free tapes available in
>> pool.

>> Device get BLOCKED and backup stop until tape is not release.

>> Below option is enable in bacula-dir file.

>> Prefer Mounted Volumes = no

>> Can you suggest solution for this?

Hello Ankush: first of all please avoid making new questions in prior existing 
topics unless they are specific related to it for the sanity of the future 
readers of those discussions. 
If you read the manual you can see that setting this directive to know is not 
recommended at all: 

"Despite the above, we recommend against setting this directive to no since it 
tends to add a lot of swapping of Volumes between the different drives and can 
easily lead to deadlock situations in the Storage daemon. We will accept bug 
reports against it, but we cannot guarantee that we will be able to fix the 
problem in a reasonable time. 

A better alternative for using multiple drives is to use multiple pools so that 
Bacula will be forced to mount Volumes from those Pools on different drives." 

Another alternative to multiplexing backup to different drives is to limit 
Maximum Concurrent Jobs in each one of Devices resources in bacula-sd.conf. 

Regards, 
=========================================================================== 
Heitor Medrado de Faria - LPIC-III | ITIL-F | Bacula Systems Certified 
Administrator II 
Do you need Bacula training? http://bacula.us/video-classes/ 
+55 61 8268-4220 
Site: http://bacula.us FB: heitor.faria 
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