On Tue, Mar 26, 14:21, Thorsten Knabe wrote > there seems to be a serious problem, when running bcache on top of a > degraded RAID-6 (MD) array. The bcache device /dev/bcache0 disappears > after a few I/O operations on the affected device and the kernel log > gets filled with the following log message: > > bcache: bch_count_backing_io_errors() md0: IO error on backing device, > unrecoverable > Setup: > Linux kernel: 5.1-rc2, 5.0.4, 4.19.0-0.bpo.2-amd64 (Debian backports) > all affected We use a similar setup on dozens of boxes here with no problems at all. We're currently running linux-4.9 on those machines, but 4.14 and 4.19 are also known to work. More information is required to tell whether this is a bcache or an md issue. Can you please provide the full dmesg output? Best Andre -- Max Planck Institute for Developmental Biology Max-Planck-Ring 5, 72076 Tübingen, Germany. Phone: (+49) 7071 601 829 http://people.tuebingen.mpg.de/maan/
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