Are you saying that Exchange Online stalls are normal? Later on in this article, I will make you aware of two more interesting stalls: StalledDueToSource_UnknownReason and StalledDueToTarget_MailboxLock (these happen more often on the on-premises side) and the common causes for those stalls. StalledDueToTarget_BigFunnel: when content indexing operations experience a temporary interruption and are actively recovering.StalledDueToTarget_Processor: happens when CPU utilization gets too high on target MRS servers involved in the move.Because of this, writes to the MDB are affected. StalledDueToTarget_DiskLatency: happens when the disk latency is at a level where adding additional I/O might impact user experience on the disk where the target mailbox database (MDB) is located.StalledDueToTarget_MdbReplication: the move monitors the copy queue of transactions logs to other DAG member servers.Migration stalls when the queue gets too big and will last until it drains. StalledDueToTarget_MdbAvailability: the move monitors replay queue of transactions logs into remote copies of databases.
Here are some most frequent stalls is Office 365 with their explanations the examples are for an onboarding move, where target is Exchange Online environment. Offboarding: migrate from Exchange Online (source) to Exchange on-premises (target).Onboarding: migrate from Exchange on-premises (source) to Exchange Online (target).The migration side that stalls could be called ‘stall side’ and it can be different for onboarding vs. Knowing all that, it is perfectly normal to sometimes see stalls on the Office 365 side during migrations. Please go through this article for more info. Mailbox migration is not considered as vital because things like mailbox moves are online moves (functionality is not impacted and access to mailboxes is mostly uninterrupted). Workloads like client connectivity and mail flow have a higher priority as they have direct impact on user functionality. In this part, we will talk about ‘slow’ migrations.įirstly, you should be aware that migration jobs to Exchange Online (which is a shared multi-tenancy environment) have a lower priority on our servers and are sometimes throttled to protect the health of the datacenter resources (server performance, disks, databases). What to do if a migration is Completed With Warnings (Part 5).Troubleshooting Slow Migrations (Part 4 - you are here).Troubleshooting Failed Migrations (Part 3).Digging Into Hybrid Migration Move Report Data (Part 2).Exchange Hybrid Migrations: More Than Just a Pretty Face (Part 1).Here is your next installment in the troubleshooting hybrid migrations blog series! See:
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