Ceph edit crush rule. . ceph is a control utility which is used for manual deployment and maintenance of a Ceph cluster. To try Ceph, see our Getting Started guides. This lifecycle starts with the bootstrapping process, when cephadm creates a tiny Ceph cluster on a single node. That means that the data that is stored and the infrastructure that supports it is spread across multiple machines and is not centralized in a single machine. The Ceph client tools and libraries can be natively used on Windows. Ceph is a clustered and distributed storage manager. Whether you want to provide Ceph Object Storage and/or Ceph Block Device services to Cloud Platforms, deploy a Ceph Filesystem or use Ceph for another purpose, all Ceph Storage Cluster deployments begin with setting up each Ceph Node, your network, and the Ceph Storage Cluster. Ceph can be used to provide Ceph Object Storage to Cloud Platforms and Ceph can be used to provide Ceph Block Device services to Cloud Platforms. I was wondering whether the CLI would permit that change. When planning your cluster’s hardware, you will need to balance a number of considerations, including failure domains, cost, and performance. Once you do that, ceph osd pool ls detail will still show as erasure profile the profile that you used for initial creation (which refers to the old crush-failure-domain), but the CRUSH rule in effect will be the new one, as the crush-failure-domain in the profile is only used during initial creation of the pool. cephadm manages the full lifecycle of a Ceph cluster. The power of Ceph can transform your company’s IT infrastructure and your ability to manage vast amounts of data. It provides a diverse set of commands that allows deployment of monitors, OSDs, placement groups, MDS and overall maintenance, administration of the cluster. ceph osd pool set POOL_NAME crush_rule RULENAME For example, [ceph:root@host01 /]# ceph osd pool set cold crush_rule hdd [ceph:root@host01 /]# ceph osd pool set hot crush_rule ssd You do not need to manually edit the CRUSH map because one hierarchy can serve multiple classes of devices. The Ceph File System, or CephFS, is a POSIX-compliant file system built on top of Ceph’s distributed object store, RADOS. By reflecting the underlying physical organization of the installation, CRUSH can model (and thereby address) the potential for correlated device failures. All Ceph Storage Cluster deployments begin with setting up each Ceph Node and then setting up the network. This avoids the need for additional layers such as iSCSI gateways or SMB shares, drastically improving the performance. For example, CRUSH maps contain a list of OSDs and a hierarchy of “buckets” (host s, rack s) and rules that govern how CRUSH replicates data within the cluster’s pools. For a detailed discussion of CRUSH, see CRUSH - Controlled, Scalable, Decentralized Placement of Replicated Data CRUSH maps contain a list of OSDs, a list of ‘buckets’ for aggregating the devices into physical locations, and a list of rules that tell CRUSH how it should replicate data in a Ceph cluster’s pools. Pool, PG and CRUSH Config Reference The number of placement groups that the CRUSH algorithm assigns to each pool is determined by the values of variables in the centralized configuration database in the monitor cluster. So, I have been trying some different custom crush rules for erasure coded pools - I have a 5 node test Ceph cluster, and wanted to try a 4+2 erasure coded pool with a custom map, putting 2 chunks per host as I am unable to do a true 4+2 with 5 nodes. Yes, I'm aware of this option, but this is not changing the failure domain of an existing rule. Thanks again for your time! Laszlo On 9/8/21 12:42 AM, Richard Bade wrote: > Hi Budai, > I agree with Nathan, just switch the crush rule. It looks like it doesn't. The power of Ceph can transform your company’s IT infrastructure and your ability to manage vast amounts of data. Ceph is designed to run on commodity hardware, which makes building and maintaining petabyte-scale data clusters flexible and economically feasible. Both containerized deployments of Ceph (deployments made using cephadm or Rook) and non-containerized deployments of Ceph rely on the values in the central configuration Set the pools to use the rules. Ceph can be used to deploy a Ceph File System. dsoa ogmoyl kimpbp gehk hwsuaej bnggsds mrvdix yaqxyimo iha uidtblr