One of them can be network problems. In such case, you may notice the cluster reaching quorum, OSD and monitor nodes going offline, data transfers taking a long time, or a lot of reconnect attempts. To check whether cluster performance is degraded by network problems, inspect the Ceph log files under the /var/log/ceph directory.
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The monitor-count option gives the number of ceph-mon units in the monitor sub-cluster (where one ceph-mon unit represents one MON). The default value is '3' and is generally a good choice, but it is good practice to set this explicitly to avoid a possible race condition during the formation of the sub-cluster.
A Ceph Monitor maintains maps of the cluster state, including the monitor map, the OSD map, the Placement Group (PG) map, and If you need to remove a monitor for maintenance : ceph-deploy.
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--- # This playbook shrinks the Ceph monitors from your cluster # It can remove any number of monitor(s) from the cluster and ALL THEIR DATA # # Use it like this: # ansible-playbook shrink-mon.yml -e mon_host=ceph-mon01,ceph-mon02 # Prompts for confirmation to shrink, defaults to no and # doesn't shrink the cluster. yes shrinks the cluster. # # ansible-playbook -e ireallymeanit=yes|no shrink ...
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Nov 20, 2015 · The Ceph cluster consists of two types of daemons: Ceph OSD and Ceph Monitor. The Ceph OSD Daemon stores data in pools striped across one or more disks. Ceph OSDs also replicate, rebalance, and recover data, and report data usage. The Ceph Monitor maintains a master copy of the Ceph storage map and the current state of the storage cluster.
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It is helpful for the monitoring activity. The command also help us to be able to configure the arrays directly from the ESXi's shell without rebooting server to use HPE Smart Array Configuration Tool.
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An update that solves one vulnerability and has 35 fixes is now available. SUSE Security Update: Security update for ceph, deepsea _____ Announcement ID: SUSE-SU-2020:3257-1 Rating: moderate References: #1151612 #1152100 #1155045 #1155262 #1156087 #1156409 #1158257 #1159689 #1160626 #1161718 #1162553 #1163119 #1164571 #1165713 #1165835 #1165840 #1166297 #1166393 #1166624 #1166670 #1166932 ...
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install Install Ceph packages on remote hosts. mon Deploy ceph monitor on remote hosts. mds Deploy ceph MDS on remote hosts. gatherkeys Gather authentication keys for provisioning new nodes. disk Manage disks on a remote host. osd Prepare a data disk on remote host.
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From excellent CEPH book ( I got it for free,but if you buy it, what I strongly advice, it worth the money you pay for it ) Learning CEPH we can read there A Ceph storage cluster requires at least one monitor to run. For high availability, a Ceph storage cluster relies on an odd number of monitors that’s more than one, for example, 3 or 5, to ...
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Using the lvremove command, remove all volumes from the LVM setup on the drive. Follow the prompts and press "Y" to remove each LVM partition from the volume group.
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nmcli monitor. Observe NetworkManager activity. Watches for changes in connectivity state Add, modify or remove properties in the connection profile. To set the property just specify the property...
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--remove ceph-deploy command line option ... Ceph Metadata Server Ceph Monitor Paxos bootstrapping monitors capacity planning clock cluster map configuring monitors
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2.5.2 Removing a Ceph Monitor Node. 2.6 Upgrading Ceph Storage Cluster Nodes. 2.6.1 Upgrading Oracle Linux.