The WAL (Write-Ahead Log) technology has been used in many systems. The mechanism of a WAL is that when a client writes data, the system does two things: Write a log to disk and return to the c...

I have a Ceph cluster of 66 OSD with a data_pool and a metadata_pool. I would like to place the metadata_pool on 3 specific OSD which are having SSDs, since all other 63 OSD having older disks. H...

I followed the following steps from https://docs.ceph.com/en/latest/cephadm/install/ to setup a ceph cluster on Centos 8.1 curl --silent --remote-name --location https://github.com/ceph/ceph/...

I'm using kubernetes v1.16.10 with a Ceph 13.2.2 Mimic cluster for dynamic volume provisioning through ceph-csi. But then I have found ceph-rbd Ceph RBD (kubernetes.io/rbd) https://kubernetes.io...

I use rook to build a ceph cluster.But my pvc get stuck in pending. When I used kubectl describe pvc, I found events from persistentvolume-controller: waiting for a volume to be created, either by ...

I configured a simple Ceph cluster with cephadm, like this: cephadm bootstrap --mon-ip 192.168.0.4 ssh-copy-id -f -i /etc/ceph/ceph.pub root@host2 ssh-copy-id -f -i /etc/ceph/ceph.pub root@h...

I got Kubernetes Cluster with 1 master and 3 workers nodes. calico v3.7.3 kubernetes v1.16.0 installed via kubespray https://github.com/kubernetes-sigs/kubespray Before that, I normally deployed al...

I'm running proxmox and I try to remove a pool which I created wrong. However it keeps giving this error: mon_command failed - pool deletion is disabled; you must first set the mon_allow_pool_dele...

I am getting both of these errors at the same time. I can't decrease the pg count and I can't add more storage. This is a new cluster, and I got these warning when I uploaded about 40GB to it. I ...

Ceph teuthology installation fails with following error on Ubuntu 14.04, kernel 4.4.0-51-generic: ImportError: <module 'setuptools.dist' from '/usr/lib/python2.7/dist-packages/setuptools/dist....

I configured Ceph with the recommended values (using a formula from the docs). I have 3 OSDs, and my config (which I've put on the monitor node and all 3 OSDs) includes this: osd pool default size...

I'm getting ready to setup my first Ceph cluster (Luminous on Fedora) for production use, and thus far I've gone through the process of running a single OSD per node on a large ZFS pool so I have c...

Has anyone tried to use GlusterFS or Ceph as the backend for Hadoop? I am not talking about just use plugin to sew things up. Is the performance better than HDFS itself? whether it's ok for product...

I am setting up a small Kubernetes cluster using a VM (master) and 3 bare metal servers (all running Ubuntu 14.04). I followed the Kubernetes install tutorial for Ubuntu. Each bare metal server als...

I am currently searching for a good distributed file system. It should: be open-source be horizontally scalable (replication and sharding) have no single point of failure have a relatively...

It looks like that RADOS is best suited to be used as the storage backend for Ceph Block Storage and File System. But if i want to use the Object Storage itself: Is there an optimum object size w...