Maintenance
RAID Concepts and Disk Checks
Read mdadm noise, interpret SMART triage, and know when to stop poking and escalate hardware.
In-person lab 4 weeks · 20 lab hours Intermediate
720,000 KRW informational until enrollment confirms
Program narrative
Classroom sleds include healthy, flaky, and intentionally mismatched drives. You practice read-only checks, document evidence for vendors, and rehearse the conversation with a fake procurement officer played by staff.
What the labs include
- mdadm examine walkthroughs
- SMART attribute cheat sheet tuned for SSD vs spinners
- Synthetic rebuild with rate limits
- Photo checklist before opening a chassis
- Vendor ticket template pack
- Risk callout when resync impacts latency
- Pair exercise on partial degradation
Outcomes you can show a lead
- Capture evidence a vendor will accept
- Choose between online rebuild vs maintenance window
- Spot when software RAID is the wrong tool
Straight FAQ
Hardware provided?
Yes, all drills use classroom sleds; do not bring production disks.
Cloud disk analogs?
We map concepts to cloud block storage in a closing session only.
What is excluded?
ZFS deep dives are not included; we reference docs instead.
Recent participant notes
“Vendor ticket template alone saved me last quarter. SMART lab smelled like hot plastic—in a good way.”
Hyun · MSP operator