Posts in category "troubleshooting"

Windows Update fails with error 0x80070490 (ERROR_NOT_FOUND) when the Component Based Servicing system can't locate packages it expects to exist. Here's how to diagnose what's actually broken using the CBS.log and systematically repair it.

If you are running Windows 11 and attempting to repair your system using the DISM /RestoreHealth command, you might have noticed the progress bar getting stuck at 62.3%. Here is what is actually happening and how to monitor it.

I renamed /usr to /usr-root as root. On a live system. Here's the recovery — and what the mistake teaches about operational discipline.

Adding a nightly reboot schedule to RAM-constrained Dell Wyse 3040 Proxmox nodes using SystemD timers instead of crontab.

How to completely remove a broken Ceph cluster from Proxmox — every service, package, config file, and orphaned mount point — so you can start fresh.

An extended power outage plus a remote kernel upgrade left half the cluster unbootable, video outputs dead, and Ceph unstable — a crash cart recovery story with four overlapping root causes.

Fixing a severely imbalanced Ceph cluster where OSDs added in batches left the first three drives at 75-85% while newer ones sat nearly empty — by tuning backfill and recovery parallelism.