Pushkar Pradhan created TS-3848:
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             Summary: ATS runs without cache or partial cache on disk errors
                 Key: TS-3848
                 URL: https://issues.apache.org/jira/browse/TS-3848
             Project: Traffic Server
          Issue Type: Bug
          Components: Cache
            Reporter: Pushkar Pradhan


Problem:
If ATS fails to initialize one or more disks it continues to run without cache. 
This can cause origin overload.
The situation can be somewhat mitigated by setting 
proxy.config.http.wait_for_cache = 1 and if none of the disks failed to 
initialize.
However, even if wait_for_cache = 1 and only one or a few disks failed to 
initialize, ATS will continue to serve traffic. 

Proposed Solution:
Define a new variable: proxy.config.http.cache.required
Value range: 0-2
0 (default) - Do nothing
1 - Abort trafficserver if it failed to initialize all the disks/volumes
2 - Abort trafficserver if it failed to initialize even one of the disks or 
volumes.

If proxy.config.http.cache.required = 1 and proxy.config.http.wait_for_cache = 
1 and if proxy.config.http.cache.required > 0 then abort the traffic server if 
one or more cache disks/volumes could not be initialized.



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