How to handle large omap objects

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 built on top of RADOS Ceph stores data in relation to Ceph/Rados objects. Ceph/Rados objects can consist of three major parts: data: bytestream key/value pairs: […]

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 […]

Deploying Ceph over IPv6

I like to deploy Ceph clusters over IPv6. I actually think that’s the way forward. IPv4 is legacy just like iSCSI and NFS are. Last week I was at a customer deploying a new Ceph cluster and they wanted to deploy with IPv6! Most deployment I did with IPv6 were done manually and not with […]