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If the I/O error policy is set to passthough, the result of the I/O error is transferred to the file system, and the bsr records the I/O block in error as OOS. If the I/O error was temporary, the OOS is retried by the file system and resolved by itself. Otherwise, the OOS area is resolved by inducing resynchronization through replication reconnection. At this time, it is left to the administrator or the HA operation logic to manage operations such as the direction of synchronization to resolve the OOS.
It is possible to automatically perform resource detaching by using detach policy, but it is recommended to set the passthrough policy rather than the detach. The passthrough policy is more reasonable in terms of service operation as it can actively respond to temporary failures on disk.
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bsr cannot determine if an I/O error is temporary or permanent, and it does not collect specific error statistics such as sector-by-sector I/O error tracking. Instead, only the number of I/O error occurrence information for the device in which the error occurred is maintained. Although the specific information is not shown, the degree of error can be determined based on the number of I/O errors in bsradm status. If a temporary error occurs, the io error and oos shown in status will only be recorded in a small amount and will not increase over time. |
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If this permanent error occurs, the administrator must reconfigure replication or replace the disk. To fix a permanent disk failure, you must first down the resource and then detach the disk from the replication state. Of course, you must reinitialize the metadisk for any replication resource that needs reconfiguration.It is possible to automatically perform resource detaching by using detach policy, but it is recommended to set the passthrough policy rather than the detach. The passthrough policy is more reasonable in terms of service operation as it can actively respond to temporary failures on disk.
Disk replacement
Regenerate the meta data set and reconnect the resources as follows. If necessary, perform a full synchronization by explicitly executing the synchronization command.
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