Arvados

Feature #17350

Updated by Nico César almost 4 years ago

Note: for this ticket examples the assumption is that there are 600 blocks equally distributed in the volumes. 

 Goal of this ticket: 
 * to have all the expected behaviour for keep-balance 
 * to add to the documentation this behaviour 
 * to add necesary tests to make sure we comply with this behaviour 

 h2. Volumes scenario 

 h3. Scenario 1 
 <pre> 
 --- 
 Clusters: 
   test1: 
     Collections: 
       DefaultReplication: 1 
     Volumes: 
       test1-nyw5e-000000000000000: 
         AccessViaHosts: 
           'http://keep0:25107': {} 
       test1-nyw5e-111111111111111: 
         AccessViaHosts: 
           'http://keep1:25108': {} 
 </pre> 

 h3. Scenario 2 
 <pre> 
 --- 
 Clusters: 
   test1: 
     Collections: 
       DefaultReplication: 1 
     Volumes: 
       test1-nyw5e-000000000000000: 
         AccessViaHosts: 
           'http://keep0:25107': {} 
       test1-nyw5e-111111111111111: 
         AccessViaHosts: 
           'http://keep1:25108': {} 
         StorageClasses: 
           archival: true 
 </pre> 

 h3. Scenario 3 
 <pre> 
 --- 
 Clusters: 
   test1: 
     Collections: 
       DefaultReplication: 1 
     Volumes: 
       test1-nyw5e-000000000000000: 
         AccessViaHosts: 
           'http://keep0:25107': {} 
       test1-nyw5e-111111111111111: 
         AccessViaHosts: 
           'http://keep1:25108': {} 
         StorageClasses: 
           archival: true 
         Read-Only 
 </pre> 

 h2. Expected result after tunnign keep balance 

 |_. Volumes scenario | Expected result after keep-balance run    | 
 | 1 | 300 blocks in each volume    | 
 | 2 | 600 blocks in test1-nyw5e-000000000000000 and 600 blocks in test1-nyw5e-111111111111111 | 
 | 3 | 600 blocks in test1-nyw5e-000000000000000 and 300 blocks in test1-nyw5e-111111111111111 | 


 To be talked in next grooming session (Feb 16th) 

 * What are the common usecase ? 
 * What other scenarios we care about?  
 * How we address the process of changing configuration and re-running keep-balance?

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