[ceph-users] BlueStore and checksum

Hi, I am trying to find out whether Ceph has a method to detect silent corruption such as bit rot. I came across this text in a book - "Mastering Ceph : Infrastructure Storage Solution with the latest Ceph release" by Nick Fisk - Luminous release of Ceph employs ZFS-like ability to checksum data at every read. BlueStore calculates and stores the crc32 checksum of any data that is written. On each read request, BlueStore reads the checksum and compares it with the data read from the device. If there is a mismatch, BlueStore will report read error and repair damage. Ceph will then retry the read from another OSD holding the object. I have two questions: 1. If there is a mismatch will the ceph user (who initiated GET) receive any error message and he has to retry OR will this error be auto-corrected by Ceph and the data would be returned from the other OSD (user will never know what went wrong underneath? 2. Does this feature work for Multi-part upload objects also? -- Regards, Priya