For exemple :

# rados lspools
data
metadata
rbd
                            <---- ?????
.eu.rgw.root
.eu-west-1.domain.rgw
.eu-west-1.rgw.root
.eu-west-1.rgw.control
.eu-west-1.rgw.gc
.eu-west-1.rgw.buckets.index
.eu-west-1.rgw.buckets
.eu-west-1.log


# ceph osd dump | grep "pool 4 "
pool 4 '' replicated size 2 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 8 …

var cluster = new rados.Rados( "ceph", "client.admin", "/etc/ceph/ceph.conf");
cluster.connect();

var ioctx = new rados.Ioctx(cluster, "data");
ioctx.aio_write("testfile2", new Buffer("1234567879ABCD"), 14, 0, function (err) {
    if (err) {
      throw err;
    }
    ...

To my knowledge, there is not yet any wrapper Node.js for librados. (I guess …

This option allows you to answer a fairly constant worry in the case of heterogeneous cluster. Indeed, all the discs do not have the same performance or not the same ratio performance / size. With this option it is possible to reduce the load on a disk without reducing the amount …

An example of using the python-ceph library for thumbnailing service.

Thumbor is an opensource tool for thumbnail generation developed by globo.

The tool allows to make a number of operations (crop, resize, filters ...) directly via the URL. It also uses face detection algos or points of interest to enhance Crop …

A simple exemple to make Replication for RBD.

Based on this post from scuttlemonkey : http://ceph.com/dev-notes/incremental-snapshots-with-rbd/, here is a sample script to synchronize rbd image on a remote cluster (eg for backups). In the example below, the sync is made to an "archive" pool on the same …