7 Aug
2019
7 Aug
'19
2:54 p.m.
I can add RAM ans is there a way to increase rocksdb
caching , can I
increase bluestore_cache_size_hdd to higher value to cache rocksdb?
In recent releases it's governed by the osd_memory_target parameter. In
previous releases it's bluestore_cache_size_hdd. Check release notes to
know for sure.
This we have planned to add some SSDs and how many
OSD's rocks db we
can add per SSDs and i guess if one SSD is down then all related OSDs
has to be re-installed.
Yes. At least you'd better not put all 24 block.db's on a single SSD :)
4-8 HDDs per an SSD is usually fine. Also check db_used_bytes in `ceph
daemon osd.0 perf dump` (replace 0 with actual OSD numbers) to figure
out how much space your DBs use. If it's below 30gb you're lucky because
in that case DBs will fit on 30GB SSD partitions.
https://yourcmc.ru/wiki/Ceph_performance#About_block.db_sizing
--
Vitaliy Filippov