[dm-devel] dm-cache: clean cache resyncs to origin on every boot

[Bogdan Vasiliev]

Hello,

I have dm-cache configuraion with SSD in writeback mode. On every boot
an entire cache resyncs to an origin device, even if it was clean
before on shutdown. It takes time and full bandwidth of an origin
device.

Is there reason for this behavior or is it a bug? Why we do not trust
a cache metadata?

My configuration details, if necessary:
storage-cache_cdata:0 41943040 linear
storage-cache_cmeta: 0 1048576 linear
storage-data: 0 1953513472 cache 8 989/131072 128 173945/327680 610488
20046 574861 3817439 0 0 0 1 writeback 2 migration_threshold 2048 mq
10 random_threshold 4 sequential_threshold 512
discard_promote_adjustment 1 read_promote_adjustment 4
write_promote_adjustment 8 rw -
storage-data_corig: 0 1953513472 linear


- Bogdan