Storage & Filesystem

Current baseline

The current validated deployment uses one 100 GB disk including Ubuntu OS and mirror data. Approximate current data sizes:

Data	Approximate size
Ubuntu OS Core / selective mirror	3.4 GiB
DP 6.6.0 Phase 2 bundle	28.2 GiB
Fresh Download and Prepare peak	~70 GiB

The application performs a conservative free-space preflight and keeps a safety reserve. Future artifact sets can grow, so 100 GB is a current baseline rather than a permanent sizing guarantee.

Optional separate data disk

A separate data disk is optional. If used, keep these paths on the same filesystem because preparation uses hard links and atomic renames:

/var/spool/apt-mirror
/var/spool/apt-mirror/.install-cache
/var/spool/apt-mirror/selective
/var/spool/apt-mirror/dp-phase2

The path name /var/spool/apt-mirror is retained for compatibility; the active workflow does not mean that the product builds a traditional full apt-mirror archive.

Resume-aware disk accounting

Interrupted ACPS downloads can retain .part files. The preflight accounts for reusable completed and partial data rather than counting the entire download twice. Do not delete .part files merely to retry an interrupted download.