Posts tagged with "iops"

Performance tuning Ceph in a homelab environment presents unique challenges, especially when running on USB storage and constrained hardware. After dealing with performance issues during cluster rebalancing and OSD expansion, I’ve learned valuable lessons about mClock configuration, IOPS optimization, and the realities of USB 3.0 storage performance.

I swapped my physical disks around in my low-end testing hardware cluster. I have a mixture of soldered to the motherboard eMMC and an external USB3 Thumbdrive serving for a root file systems and external /usr volumes now. I would like a quick performance check on reading and writing to those file systems. I also don’t want to setup a huge performance benchmark suite or additional tooling. I just want some quick results at this point.

My basic question is what did I loose in this decision to break out my /usr out to an external USB3 drive. How much performance did I loose?