/etc/writeboosttab is in writeboost 1.20160718-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | ## dm-writeboost "tab" (mappings) file, see writeboosttab(5).
##{DM target name} {cached block device e.g. HDD} {caching block device e.g. SSD} [options]
##
## wb_hdd /dev/disk/by-uuid/2e8260bc-024c-4252-a695-a73898c974c7 /dev/disk/by-partuuid/43372b68-3407-45fa-9b2f-61afe9c26a68 writeback_threshold=70,sync_data_interval=3600
##
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