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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…
Slow requests in Ceph When a I/O operating inside Ceph is taking more than X seconds, which is 30 by…
read moreTRIM/DISCARD Using TRIM/DISCARD you can give back free space to a Ceph cluster. Normally, any thin provisioned block device will…
read moreAt PCextreme we have a 700TB Ceph cluster which is used behind our public cloud Aurora Compute which runs Apache…
read moreThis weekend I got to investigate a Ceph cluster which had issues where the Monitors were constantly performing new elections.…
read moreOne of the dangers of Ceph was that by accident you could remove a multi TerraByte pool and loose all…
read moreIf you want to use CentOS 7.1 for your hypervisors with Apache CloudStack and Ceph’s RBD as Primary Storage you…
read moreThis week I’m testing a lot with CephFS and one of the things I never tried was re-exporting CephFS using…
read moreI’m a big fan of Ceph and IPv6, so I always try to deploy Ceph over IPv6 when possible. Ceph…
read moreAt my hosting company PCextreme we are building a cloud offering based on Ceph and CloudStack. We call our cloud…
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