Ceph Minimal Resource ceph.conf
Category : Supporting Scripts
The below file content should be added to your ceph.conf file to reduce the resource footprint for low powered machines.
The file may need to be tweaked and tested, as with any configuration, but pay particular attention to osd journal size. As with many data storage systems, Ceph creates a journal file of content that’s waiting to be committed to ‘proper’ storage. The osd journal size sets the the maximum amount of data that can be stored in the journal.
It should be calculated as follows:
2 * (T * filestore max sync interval)
T in this scenario is the lowest maximum throughput that’s expected through the network or on the disk. For example, a standard mechanical hard disk writes at roughly 100MB/ s. A 1GBPS network has a maximum throughput of 125 MB/s and therefore 100MB is the value of T. The parameter filestore max sync interval is 5 by default.
Therefore, 2 * (100 * 5 ) = 1000.
# Disable in-memory logs debug_lockdep = 0/0 debug_context = 0/0 debug_crush = 0/0 debug_buffer = 0/0 debug_timer = 0/0 debug_filer = 0/0 debug_objecter = 0/0 debug_rados = 0/0 debug_rbd = 0/0 debug_journaler = 0/0 debug_objectcatcher = 0/0 debug_client = 0/0 debug_osd = 0/0 debug_optracker = 0/0 debug_objclass = 0/0 debug_filestore = 0/0 debug_journal = 0/0 debug_ms = 0/0 debug_monc = 0/0 debug_tp = 0/0 debug_auth = 0/0 debug_finisher = 0/0 debug_heartbeatmap = 0/0 debug_perfcounter = 0/0 debug_asok = 0/0 debug_throttle = 0/0 debug_mon = 0/0 debug_paxos = 0/0 debug_rgw = 0/0 osd heartbeat grace = 8 [mon] mon compact on start = true mon osd down out subtree_limit = host [osd] # Filesystem Optimizations osd mkfs type = btrfs osd journal size = 512 # Performance tuning max open files = 327680 osd op threads = 2 filestore op threads = 2 #Capacity Tuning osd backfill full ratio = 0.95 mon osd nearfull ratio = 0.90 mon osd full ratio = 0.95 # Recovery tuning osd recovery max active = 1 osd recovery max single start = 1 osd max backfills = 1 osd recovery op priority = 1 # Optimize Filestore Merge and Split filestore merge threshold = 40 filestore split multiple = 8
With thanks to Bryan Apperson for the config.