We recently upgraded one of our clusters from 14.2.21 to 15.2.13 and had
some troubles with osd performance. After reading some threads we
manually compacted the rocksdb's on all osds and hope that that will
alleviate the problem
I noted that in the 15.2.13 release bluefs_buffered_io is now default
set to enabled. As I understand it this will make use of the linux
buffer cache for some rocksdb operations. Previously under nautilus we
had increased osd_memory_target (bluefs_buffered_io was default disabled
at that time). I now wonder whether we should tune that down a bit to
leave more memory for the linux buffer cache.
Are there any recommendations on how to divide memory on a storage
system?
Thanks
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