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Do not use SMR disks with Ceph 150 150 Wido den Hollander
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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…

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Testing Ceph BlueStore with the Kraken release 150 150 Wido den Hollander
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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…

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Running headless VirtualBox inside Nested KVM 150 150 Wido den Hollander
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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, Windows and Linux. For the internal Git at 42on we use Gitlab and I wanted to use Gitlab’s CI to…

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Chown Ceph OSD data directory using GNU Parallel 150 150 Wido den Hollander
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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 Jewel daemons were running under root which is a potential security issue. This means data has to change ownership before…

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Slow requests with Ceph: ‘waiting for rw locks’ 150 150 Wido den Hollander
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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 default, it will be logged as a slow request. This is to show you as a admin that something is…

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