i can't find any reference to the word 'unwritable' in the log. However there are other records in the log for today and going back every day to last week when we migrated. E.g, as below:
Nov 10 14:07:04 +0000 OX-58247f0870d44 [ info] Running Automatic Maintenance Task
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Running Maintenance Engine
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Running Maintenance Statistics Engine
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OX_Maintenance_Statistics_Task_SetUpdateRequirements
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - Maintenance statistics will be run
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - The intermediate table statistics will be updated
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - The final table statistics will be updated
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OX_Maintenance_Statistics_Task_SetUpdateRequirements
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OX_Maintenance_Statistics_Task_MigrateBucketData
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - The rv_data_bkt_a table is a raw data table. Data logged in real-time, not operation intervals.
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - Accordingly, pruning of the rv_data_bkt_a table will be performed based on data that has a logged date between
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] 2016-11-10 13:00:00 UTC and 2016-11-10 13:59:59 UTC
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - The rv_data_bkt_a_var table is a raw data table. Data logged in real-time, not operation intervals.
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - Accordingly, pruning of the rv_data_bkt_a_var table will be performed based on data that has a logged date between
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] 2016-11-10 13:00:00 UTC and 2016-11-10 13:59:59 UTC
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OX_Maintenance_Statistics_Task_MigrateBucketData
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OX_Maintenance_Statistics_Task_DeDuplicateConversions
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OX_Maintenance_Statistics_Task_DeDuplicateConversions
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OX_Maintenance_Statistics_Task_ManageConversions
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OX_Maintenance_Statistics_Task_ManageConversions
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OX_Maintenance_Statistics_Task_SummariseFinal
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OX_Maintenance_Statistics_Task_SummariseFinal
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OX_Maintenance_Statistics_Task_LogCompletion
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OX_Maintenance_Statistics_Task_LogCompletion
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OX_Maintenance_Statistics_Task_ManageCampaigns
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - Managing (activating/deactivating) campaigns
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OX_Maintenance_Statistics_Task_ManageCampaigns
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Maintenance Statistics Engine Completed (Started at 2016-11-10 14:07:04 UTC)
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Running Maintenance Priority Engine
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OA_Maintenance_Priority_AdServer_Task_GetRequiredAdImpressionsLifetime
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OA_Maintenance_Priority_AdServer_Task_GetRequiredAdImpressionsLifetime
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OA_Maintenance_Priority_AdServer_Task_GetRequiredAdImpressionsDaily
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OA_Maintenance_Priority_AdServer_Task_GetRequiredAdImpressionsDaily
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OA_Maintenance_Priority_AdServer_Task_AllocateZoneImpressions
Nov 10 14:07:04 +0000 OX-maintenance-58247f0870d44 [ info] - Selecting Zones forecasts for all managers for OI from 2016-11-10 14:00:00 to 2016-11-10 14:59:59
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Inserted 1342 rows in the table tmp_ad_zone_impression
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OA_Maintenance_Priority_AdServer_Task_AllocateZoneImpressions
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OA_Maintenance_Priority_AdServer_Task_PriorityCompensation
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] - Selecting Zones forecasts for all managers for OI from 2016-11-10 14:00:00 to 2016-11-10 14:59:59
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OA_Maintenance_Priority_AdServer_Task_PriorityCompensation
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OA_Maintenance_Priority_AdServer_Task_ECPMforContract
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] - Selecting All Managers
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] - Selecting active campaigns with priority = '9' for manager 1
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] - Selecting active campaigns with priority = '8' for manager 1
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] - Selecting active campaigns with priority = '7' for manager 1
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] - Selecting active campaigns with priority = '6' for manager 1
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OA_Maintenance_Priority_AdServer_Task_ECPMforContract
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Task begin: OA_Maintenance_Priority_AdServer_Task_ECPMforRemnant
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] - Selecting Managers with ECPM priority campaigns running
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Task complete: OA_Maintenance_Priority_AdServer_Task_ECPMforRemnant
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Maintenance Priority Engine Completed (Started at 2016-11-10 14:07:04 UTC)
Nov 10 14:07:05 +0000 OX-maintenance-58247f0870d44 [ info] Maintenance Engine Completed (Started at 2016-11-10 14:07:04 UTC, taking 00:00:01)
Nov 10 14:07:05 +0000 OX-58247f0870d44 [ info] Automatic Maintenance Task Completed