By Michael McGarrah ·
10 min read
I've been writing about technology since 2004. This blog has lived on WordPress, Blogger, and now Jekyll on GitHub Pages. Here's how I set it up, what I added along the way, and what I'd do differently if I started over.
By Michael McGarrah ·
35 min read
Nine of my fifteen Ceph OSDs use WAL-only acceleration while six use DB. I set out to measure the performance gap and discovered the real story isn't WAL vs DB — it's the USB 3.0 hardware ceiling that dominates everything. The matched-hardware comparison shows DB is 5-15% faster on reads, not the 32% that naive cross-node testing suggested.
By Michael McGarrah ·
5 min read
Typing passwords every time you SSH into a Proxmox node gets old fast — especially with a six-node cluster. Here's how to set up SSH key authentication and an SSH config so you can just type 'ssh harlan' and be in.
By Michael McGarrah ·
16 min read
Running Ceph on USB drives sounds crazy until you put the WAL and DB on an SSD. Here's how separating metadata onto a Crucial MX500 transformed my 15-OSD homelab cluster from sluggish to surprisingly capable — at a fraction of all-SSD costs.
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