Let’s say Application running on Node 1 issued an IO or metadata operation that CSVFS forwarded to NTFS over SMB (follow the red path on the diagram above). On the diagram above you can see two node cluster, Node 2 is coordinator node. You can learn more about SMB multichannel in the following blog postsĬonfiguring IP Addresses and Dependencies for Multi-Subnet ClustersĬonfiguring IP Addresses and Dependencies for Multi-Subnet Clusters - Part IIĬonfiguring IP Addresses and Dependencies for Multi-Subnet Clusters - Part IIIįorce network traffic through a specific NIC with SMB multichannel If IO times out then SMB client would attempt to fail IOs to another channel in multichannel configuration or if all channels are exhausted then it would fail IO back to the caller. This is happening when SMB client observes that an IO is taking over 1-4 minutes (depending on IO type). One of common auto-pause reasons is STATUS_IO_TIMEOUT, because of intra-cluster communication over the network. Remove all byte range locks on file close Here is the complete list of sources.Īpply byte range lock on down-level file systemĬontinues availability resume complete for paging file objectĬontinues availability suspend handle on close
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In addition to status code the Event 9296 will contain the source of the auto-pause, and in some cases may contain additional parameters helping to further narrow down the scenario. Source: Microsoft-Windows-FailoverClustering-CsvFs-Diagnostic Log Name: Microsoft-Windows-FailoverClustering-CsvFs/Operational The description field will contain the specific status code that resulted in the auto pause. When CSV conducts an auto pause, an event 5120 is written to the System event log.
In these cases you might see auto-pauses with status codes like STATUS_UNSUCCESSFUL or STATUS_PURGE_FAILED or STATUS_CACHE_PAGE_LOCKED. An example would be when file is opened from multiple computers, and on write from one cluster node CSV needs to purge cache on another node, and that purge fails because someone has locked pages then we would auto-pause to see if retry would avoid the problem. There are also few cases when CSV might auto-pause itself to handle some inconsistency that it observes in its state or when it cannot get to the desired state without compromising data correctness. This list contains status codes that indicate communication/authentication/configuration failure, status codes that indicate that NTFS/disk on coordinating node are failing, and few CSV specific status codes. Please note that this list evolves and changes as we discover new scenarios that we can help to make more resilient using auto pause. This list is based on our experience and many years of testing, and includes status codes that you would see when communication channel fails or when storage stack is failing. STATUS_CLUSTER_CSV_VOLUME_DRAINING_SUCCEEDED_DOWNLEVEL