Ceph replication 2 vs 3

Aug 31, 2009 · With all of the discussions over the past years about MySQL Replication vs. DRBD (where the "vs." part is in fact grossly misled of course -- they are two technologies that complement each other quite well), here's one with a slightly different angle: does it make sense to roll your own cluster manager around MySQL… HEAD-TO-HEAD: MYSQL ON CEPH VS. AWS 31 18 18 78 - 10 20 30 40 50 60 70 80 90 ) AWS EBS Provisioned-IOPS Ceph on Supermicro FatTwin 72% Capacity Ceph on Supermicro MicroCloud 87% Capacity Ceph on Supermicro MicroCloud 14% Capacity

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Ceph Test Methodology. Red Hat Ceph Storage 3.0 (12.2.1) is configured with FileStore with 2 OSDs per Micron 9200MAX NVMe SSD. A 20GB journal was used for each OSD. Ceph Luminous Community (12.2.4) is configured with BlueStore with 2 OSDs per Micron 9200MAX NVMe SSD. RocksDB and WAL data are stored on the same partition as data.

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Storing Data¶. The Ceph Storage Cluster receives data from Ceph Clients -whether it comes through a Ceph Block Device, Ceph Object Storage, the Ceph File System or a custom implementation you create using librados - which is stored as RADOS objects. Each object is stored on an Object Storage Device.Ceph OSD Daemons handle read, write, and replication operations on storage drives.10.3. Add a Simple Rule To add a CRUSH rule, you must specify a rule name, the root node of the hierarchy you wish to use, the type of bucket you want to replicate across (e.g., rack , row , etc) and the mode for choosing the bucket. Red Hat Ceph Storage is rated 7.0, while StorPool is rated 10.0. The top reviewer of Red Hat Ceph Storage writes "Excellent user interface, good configuration capabilities and quite stable". On the other hand, the top reviewer of StorPool writes "Enabled us to increase both our gross margins and performance while also decreasing latency".

ceph replication 2 vs 3, Ceph Replication. By default three copies of the data are kept, although this can be changed! Ceph can also use Erasure Coding, with Erasure Coding objects are stored in k+m chunks where k = # of data chunks and m = # of recovery or coding chunks. Example k=7, m= 2 would use 9 OSDs – 7 for data storage and 2 for recovery Jan 13, 2017 · Therefore, you could either set the "rbd_mirroring_replay_delay = XYZ" override in the rbd-mirror daemon's config file to globally apply a delay, wait for 12.2.3, or with 12.2.2 you can restart rbd-mirror after the metadata change propagates so that it picks up the new configuration option.

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