Hello! Recently, we did data migration from one crush root to another, but after that, we found some objects were wrong and their copies on other OSDs were also wrong. Finally, we found that for one pg, the data migration uses only one OSD's data to generate three new copies, and do not check the crc before migration like assuming the data is always correct (but actually nobody can promise it). We tried both filestore and bluestore, and the results were the same. Copying from one pg without crc check may lack reliability. Is there any way to ensure the correctness of data when data migration? Although we can do deep scrub before migration, but the cost is too high. I think when peering, adding crc check for objects before copying may work. Regards Poi
