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Guys, I tried to use dm cache and it works great, when related to performance, but after some days of using it, the file system got corrupted. I tried three times everything from the beginning, but every time it corrupts. I use ext4, then xfs, the same thing. I used kernel 3.10.0 and 3.9.2 and I build the dm-cahe device with this:
dmsetup create cache --table '0 35104223232 cache /dev/sdc1 /dev/sdc2 /dev/sdb 8192 1 writeback default 0
and then use only this:
dmsetup message cache 0 sequential_threshold 32768
to set proper sequential IO threshold for my use. My server streams video files.
sdc - 6xSSDs (480G each), sdb - 8xSATA (3T each). Can you help me to debug the problem and to help you track the glitch? I think the project is great! Thanks in advance.