The tools, rados bench and rados load-gen, which we discussed in the last recipe, are used to benchmark the Ceph cluster pool. In this recipe, we will focus on benchmarking the Ceph block device with the rbd bench-write tool.
The ceph rbd command-line interface provides an option known as bench-write, which is a tool to perform write benchmarking operations on the Ceph Rados Block Device.
To benchmark the Ceph block device, we need to create a block device and map to the Ceph client node:
- Create a Ceph block device named
block-device1, of size 1G, and map it:# rbd create block-device1 --size 10240 # rbd info --image block-device1 # rbd map block-device1 # rbd showmapped
- Create a filesystem on the block device and mount it:
# mkfs.xfs /dev/rbd0 # mkdir -p /mnt/ceph-block-device1 # mount /dev/rbd0 /mnt/ceph-block-device1 # df -h /mnt/ceph-block-device1
- To benchmark
block-device1for 5GB of total write length, execute the following command:# rbd bench-write block-device1 --io-total 5368709200
As you can see, the rbd bench-write outputs nicely formatted results.
You can use different options with the rbd bench-write tool to adjust the block size, number of threads, and io-pattern.
- Chapter 2, Working with Ceph Block Device, where we covered the creation of the Ceph block device in detail.
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