Updates

Author: dukicn

articles/storage/common/media/tape-migration-guide/tape-migration-steps.png

@@ -142,7 +142,7 @@ After we gathered basic information, we can prepare for the migration. Every mig
 ### Migration phase
 
 Once the migration design is final, we start the migration process. Before ramping up to full migration pace, we always perform a test with a smaller sample. Goal for the test is to make sure that end-to-end process works. It allows us to make tweaks, and improve the process. Once the test is successful, we ramp up fully till the migration is done.
-For each file we migrate, we need to perform data validation to make sure that data wasn't corrupted during the migration process. In ideal situation, source data already contains hash values that can be easily compared to hash values post-migration. If they match, file is marked as migrated. If not, file is discarded, and migrated again. Sometimes. The original data is corrupted on the source tapes, and that is the reason why having the original hash values helps with catching those cases. In cases like that, we can read the data from secondary copy if it exists. Data validation process is a critical component for migration design and process for handling failed validation must be defined. Migration phase is also constantly monitored to make sure we can react to unpredictable situation, and adapt to it.
+For each file we migrate, we need to perform data validation to make sure that data wasn't corrupted during the migration process. In ideal situation, source data already contains hash values that can be easily compared to hash values post-migration. If they match, file is marked as migrated. If not, file is discarded, and migrated again. Sometimes. The original data is corrupted on the source tapes, and that is the reason why having the original hash values helps with catching those cases. In cases like that, we can read the data from secondary copy if it exists. Data validation process is a critical component for migration design and process for handling failed validation must be defined. Migration phase is also constantly monitored to make sure we can react to unpredictable situation, and adapt to it. Regular reporting to main stakeholders is important to keep the migration on track.
 
 ### Post-migration phase