Hi,
According to the source code of ceph11.2.0，we known that Bluestore WAL and
DB are s stored in the top 4% of the OSD disk space.But I found that it didn't
really need so much.I decided to modify it to 0.5%, then the meta data size was
usually just less than 0.2% in the experiment.Due to my experimental
environment(only 10 1TB HDDs), I can't make sure that the modification will be
a problem, so I'd like to ask you how much space WAL and DB usually need .
ps:In order to reduce the memory consumption, I have to modify the rocksdb
configuration: OPTION (bluestore_rocksdb_options, OPT_STR,
compression=kNoCompression, max_write_buffer_number=2,
min_write_buffer_number_to_merge=1, recycle_log_file_num=4, write_buffer_size=
32768)
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