5 more ways to break your Ceph cluster
While we’ve been working with customers using Ceph in a variety of ways, we have encountered some several ways to break your Ceph cluster. In that light, here is an update on five more ways to break your Ceph cluster as a continuation of the original presentation done by Wido den Hollander which is called; […]
42on at Ceph month!
With June already here, it is time for the annual Ceph month. Previously held as a conference and called Cephalocon, this year the event will be held online due to obvious reasons. So, why Ceph month? Ceph month aims at bringing together engineers and architects with an interest in Ceph, software-defined storage, and data center […]
Press release
Fairbanks, leading provider in open source cloud solutions, announces the acquisition of 42on, leading provider of services for the scalable, open source Ceph storage platform. With this acquisition, Fairbanks expands its service portfolio in the open infrastructure realm. Ruud Harmsen, founder and CEO of Fairbanks: “We have been managing and supporting highly available private OpenStack […]
Setting noout flag per Ceph OSD
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 what you want as you might be performing maintenance on a part of the cluster, but you sill want other OSDs which go down to […]
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. In certain situations you can’t contact the Mgr daemons directly and you have to place a Proxy server between your computer and the Mgr daemons. This can be done easily with HAProxy and the following […]
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 on this can be found on the link provided. For a Ceph and CloudStack environment I needed to set up a Proof-of-Concept using VXLAN and some refurbished hardware. The main purpose of this PoC is […]
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 that certain Placement Groups stay stuck in the activating state. 44 activating+undersized+degraded+remapped PG Overdose This is a side-effect of the new PG overdose protection in Ceph Luminous. Too many PGs on your OSDs can cause […]
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 a very simple on-line command to do this: ceph osd metadata|jq ‘.[].ceph_version’|sort|uniq -c Running this on a cluster which is currently being upgraded to Jewel to Luminous it shows: 10 “ceph version 10.2.6 (656b5b63ed7c43bd014bcafd81b001959d5f089f)” 1670 […]
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 these disks offer a very low price per Gigabyte they seem interesting to use in a Ceph cluster. Performance Due to the nature of SMR these disks are very, very, very bad when it comes […]
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 OSDs is now available. BlueStore The current backend for the OSDs is the FileStore which mainly uses the XFS filesystem to store it’s data. To overcome several limitations of XFS and POSIX in general the […]
