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:
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
# mkfs.xfs /dev/rbd0 # mkdir -p /mnt/ceph-block-device1 # mount /dev/rbd0 /mnt/ceph-block-device1 # df -h /mnt/ceph-block-device1
block-device1
for 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.
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