We probably want to start by simplifying/narrowing it down a bit - we
can eliminate the possibility of the disk having anything to do with it
and just use the SSD by forcing everything to writeback mode:
For that you'll want to disable both sequential bypass (echo 0 >
/sys/block/bcache/bcacheN/sequential_cutoff) and the congested
thresholds -
echo 0 > /sys/fs/bcache/<cache set>/congested_read_threshold_us,
echo 0 > /sys/fs/bcache/<cache set>/congested_write_threshold_us
After that (assuming you're also in writeback mode) all writes will be
writeback writes until the device is more than half full of dirty data.
Can you check if transactions are still getting lost in that setup? If
so (I kind of expect they will be) we may have to do a bit of
blktracing, but that'll really narrow down the possibilities.
Yes, the most recent transactions are still lost.
Greetings,
Pierre Beck
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