Start writing the ceph-benchmarking post

content/ceph-benchmarking/index.md

@@ -9,4 +9,38 @@ categories = ["Homelab"]
 tags = ["Homelab", "Ceph"]
 +++
 
-TODO
+## Setup everything for the Benchmarking
+On a machine in the ceph-cluster already:
+1. Generate a minimal ceph config using `ceph config generate-minimal-conf`
+2. Create a user for Benchmarking
+    1. Create a new user `ceph auth add client.linux_pc`
+    2. Edit the caps for my use-case
+        - `mgr`: `profile rbd pool=test-rbd`
+        - `mon`: `profile rbd`
+        - `osd`: `profile rbd pool=test-rbd`
+    3. Get the keyring configuration using `ceph auth get client.linux_pc`
+
+On the client machine doing the Benchmarking:
+1. Install basic ceph tools `apt-get install -y ceph-common`
+2. Load the rbd kernel module `modprobe rbd`
+3. Setup local ceph config
+    - Copy the generated configuration to `/etc/ceph/ceph.conf`
+    - `chmod 644 /etc/ceph/ceph.conf`
+4. Setup local ceph keyring
+    - Copy the keyring configuratio nto `/etc/ceph/ceph.client.linux_pc.keyring`
+    - `chmod 644 /etc/ceph/ceph.client.linux_pc.keyring`
+5. Confirm your configuration is working by running `ceph -s -n client.linux_pc`
+
+Setup the benchmark itself:
+1. `rbd create -n client.linux_pc --size 10G --pool test-rbd bench-volume`
+2. `rbd -n client.linux_pc device map --pool test-rbd bench-volume` (which should create a new block device, likely `/dev/rbd0`)
+3. `mkfs.ext4 /dev/rbd0`
+4. `mkdir /mnt/bench`
+5. `mount /dev/rbd0 /mnt/bench`
+
+## Benchmarks
+
+## TODO
+- Try directly on the block device
+- Try this using xfs instead of ext4
+- Try this with and without drive caches