Arvados

Feature #17350

Updated by Nico César almost 4 years ago

Note: for Once #17349 is done, railsapi will have "replicas_desired" with some values that accept several storage classes.  

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

 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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