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Creating a Management Routing Instance (VRF) on Juniper QFX5100

Creating a Management Routing Instance (VRF) on Juniper QFX5100 1414 1001 Wido den Hollander

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…

Setting noout flag per Ceph OSD

Setting noout flag per Ceph OSD 1630 1001 Wido den Hollander

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…

Comparing two Ceph CRUSH maps

Comparing two Ceph CRUSH maps 1500 1000 Wido den Hollander

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…

HAProxy in front of Ceph Manager dashboard

HAProxy in front of Ceph Manager dashboard 1500 1000 Wido den Hollander

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 with Ceph: ‘waiting for rw locks’ 1500 1000 Wido den Hollander

Slow requests with Ceph: ‘waiting for rw locks’

Slow requests in Ceph When a I/O operating inside Ceph is taking more than X seconds, which is 30 by…

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Using TRIM/DISCARD with Ceph RBD and libvirt 1500 1000 Wido den Hollander

Using TRIM/DISCARD with Ceph RBD and libvirt

TRIM/DISCARD Using TRIM/DISCARD you can give back free space to a Ceph cluster. Normally, any thin provisioned block device will…

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The Ceph Trafficlight 1610 1000 Wido den Hollander

The Ceph Trafficlight

At PCextreme we have a 700TB Ceph cluster which is used behind our public cloud Aurora Compute which runs Apache…

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Ceph Monitors are laggy or clock might be skewed 1500 1000 Wido den Hollander

Ceph Monitors are laggy or clock might be skewed

This weekend I got to investigate a Ceph cluster which had issues where the Monitors were constantly performing new elections.…

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Protecting your Ceph pools against removal or property changes 1506 1001 Wido den Hollander

Protecting your Ceph pools against removal or property changes

One of the dangers of Ceph was that by accident you could remove a multi TerraByte pool and loose all…

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Rebuilding libvirt under CentOS 7.1 with RBD storage pool support 1494 1000 Wido den Hollander

Rebuilding libvirt under CentOS 7.1 with RBD storage pool support

If you want to use CentOS 7.1 for your hypervisors with Apache CloudStack and Ceph’s RBD as Primary Storage you…

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NFS-Ganesha with libcephfs on Ubuntu 14.04 1267 950 Wido den Hollander

NFS-Ganesha with libcephfs on Ubuntu 14.04

This week I’m testing a lot with CephFS and one of the things I never tried was re-exporting CephFS using…

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Ceph with a cluster and public network on IPv6 1267 950 Wido den Hollander

Ceph with a cluster and public network on IPv6

I’m a big fan of Ceph and IPv6, so I always try to deploy Ceph over IPv6 when possible. Ceph…

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PowerDNS backend for a global RADOS Gateway namespace 1267 950 Wido den Hollander

PowerDNS backend for a global RADOS Gateway namespace

At my hosting company PCextreme we are building a cloud offering based on Ceph and CloudStack. We call our cloud…

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