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How to handle large omap objects

How to handle large omap objects 1506 1001 Wout van Heeswijk

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…

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…

Comparing two Ceph CRUSH maps 1500 1000 Wido den Hollander

Comparing two Ceph CRUSH maps

Sometimes you want to test if changes you are about to make to a CRUSH map will cause data to…

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

HAProxy in front of Ceph Manager dashboard

The Ceph Mgr dashboard plugin allows for an easy dashboard which can show you how your Ceph cluster is performing.…

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VXLAN with VyOS and Ubuntu 18.04 1267 950 Wido den Hollander

VXLAN with VyOS and Ubuntu 18.04

VXLAN Virtual Extensible LAN uses encapsulation technique to encapsulate OSI layer 2 Ethernet frames within layer 4 UDP datagrams. More…

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Placement Groups with Ceph Luminous stay in activating state 1500 1001 Wido den Hollander

Placement Groups with Ceph Luminous stay in activating state

Placement Groups stuck in activating When migrating from FileStore with BlueStore with Ceph Luminuous you might run into the problem…

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Quick overview of Ceph version running on OSDs 1500 1000 Wido den Hollander

Quick overview of Ceph version running on OSDs

When checking a Ceph cluster it’s useful to know which versions you OSDs in the cluster are running. There is…

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Do not use SMR disks with Ceph 1500 1000 Wido den Hollander

Do not use SMR disks with Ceph

Many new disks like the Seagate He8 disks are using a technique called Shingled Magnetic Recording to increase capacity. As…

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Testing Ceph BlueStore with the Kraken release 1506 1000 Wido den Hollander

Testing Ceph BlueStore with the Kraken release

Ceph version Kraken (11.2.0) has been released and the Release Notes tell us that the new BlueStore backend for the…

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Running headless VirtualBox inside Nested KVM 1500 1001 Wido den Hollander

Running headless VirtualBox inside Nested KVM

For the Ceph training at 42on I use VirtualBox to build Virtual Machines. This is because they work under MacOS,…

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Chown Ceph OSD data directory using GNU Parallel 1500 1000 Wido den Hollander

Chown Ceph OSD data directory using GNU Parallel

Starting 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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