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Every once in a while a customer will ask me what to do with these messages: health: HEALTH_WARN1 large omap objects First lets see what this means: Ceph services are…
For a Ceph cluster I have two Juniper QFX5100 switches running as a Virtual Chassis. This Virtual Chassis is currently only performing L2 forwarding, but I want to move this…
Prior to Ceph Luminous you could only set the noout flag cluster-wide which means that none of your OSDs will be marked as out. On large(r) cluster this isn’t always…
Sometimes you want to test if changes you are about to make to a CRUSH map will cause data to move or not. In this case I wanted to change…
The Ceph Mgr dashboard plugin allows for an easy dashboard which can show you how your Ceph cluster is performing. In certain situations you can’t contact the Mgr daemons directly…
Sometimes you want to test if changes you are about to make to a CRUSH map will cause data to…
read moreThe Ceph Mgr dashboard plugin allows for an easy dashboard which can show you how your Ceph cluster is performing.…
read moreVXLAN Virtual Extensible LAN uses encapsulation technique to encapsulate OSI layer 2 Ethernet frames within layer 4 UDP datagrams. More…
read morePlacement Groups stuck in activating When migrating from FileStore with BlueStore with Ceph Luminuous you might run into the problem…
read moreWhen checking a Ceph cluster it’s useful to know which versions you OSDs in the cluster are running. There is…
read moreMany new disks like the Seagate He8 disks are using a technique called Shingled Magnetic Recording to increase capacity. As…
read moreCeph version Kraken (11.2.0) has been released and the Release Notes tell us that the new BlueStore backend for the…
read moreFor the Ceph training at 42on I use VirtualBox to build Virtual Machines. This is because they work under MacOS,…
read moreStarting with Ceph version Jewel (10.2.X) all daemons (MON and OSD) will run under the privileged user ceph. Prior to…
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