Below are a few TCP tunables that I ran into when looking into TCP performance tuning for CEPH. Note that there are two separate sections for 10GE connectivity, so you will want to test with both to find what works best for your environment. To implement, we just add what is below to /etc/sysctl.d/99-sysctl.conf and … Continue reading CEPH: TCP Performance Tuning
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Salt Minion: ExecStart=/usr/bin/salt-minion (code=exited, status=1/FAILURE)
Ran into this error today when trying to rebuild my CEPH cluster. After removing all CEPH packages I was working through the Red Hat CEPH 1.3 install guide and was running the command below.
CEPH: How to Restart an Install, or How to Reset a Cluster
Hey, are you installing CEPH in your test lab and you screwed it up, or something has gone wrong with your test cluster and you want to start over? Well, the instructions on how to do this are below.
Ceph: Simple Ceph Pool Commands for Beginners
CEPH is a very well documented technology. Just check out the documentation for ceph at ceph.com. Pretty much everything that you want to know about CEPH is documented there. However, this also means that you possibly need to dig around just to remember a few simple commands. Because of this, I have decided to put … Continue reading Ceph: Simple Ceph Pool Commands for Beginners
Ceph: Show OSD to Journal Mapping
In Ceph, when you create an OSD (Object Storage Device) you also need to create its Journal, which is where data is initially written before it is flushed to an OSD. Note that too maximize I/O it is suggested to use SSD drives as the journal partitions for your OSDs (see this link for reference). So this … Continue reading Ceph: Show OSD to Journal Mapping
Ceph: Show Placement Group Totals by OSD
Note that I did not write this scriptlet this nor do I claim to have written this scriptlet. However, I did want to make sure that I did not lose the link to such a very handy command. The original can be found here, plus the original article has links to several more useful Urls, … Continue reading Ceph: Show Placement Group Totals by OSD
Ceph: Cluster Updates Are Stale. The Cluster isn’t updating Calamari. Please contact Administrator
There are probably many different issues that can cause this error in the Calamari WebUI. However this fixed worked for me. Note that this was post install and OSD deployment... I did not have a working cluster at this point. First ssh into your Admin node, in this case my admin and monitor node are … Continue reading Ceph: Cluster Updates Are Stale. The Cluster isn’t updating Calamari. Please contact Administrator