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plex: Media/ cache lives on the 3TB ext4 disk from day one, not the SSD

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Bind mount is now active, not a commented Phase-2 option — Mike's call
2026-07-31 (337 GB is too large for the SSD). Quick Sync confirmed as
the transcode device; NAS account is read-only on the library shares.
This commit is contained in:
thethreemagi
2026-07-31 19:34:52 +01:00
parent 6f0605a4fd
commit 579787c8db
1 changed files with 23 additions and 20 deletions
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plex/docker-compose.yml
+23 -20
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@@ -28,8 +28,11 @@ services:
# Claiming would create a NEW server identity and throw that away. # Claiming would create a NEW server identity and throw that away.
devices: devices:
# Quick Sync on the UHD 630. No session cap and better HDR tone mapping # Quick Sync on the UHD 630 — DECIDED 2026-07-31. No session cap and
# than the Pascal-era NVENC on the 1070. # better HDR tone mapping than the Pascal-era NVENC on the 1070, and the
# i915 driver lives in the kernel, so nothing breaks on updates. The
# GTX 1070 stays free for other work. Requires the BIOS iGPU
# Multi-Monitor toggle or /dev/dri does not exist.
- /dev/dri:/dev/dri - /dev/dri:/dev/dri
group_add: group_add:
@@ -39,36 +42,36 @@ services:
- "${RENDER_GID:-993}" - "${RENDER_GID:-993}"
volumes: volumes:
# ---- Plex data directory ------------------------------------------- # ---- Plex data directory (SSD): database + Metadata, NOT Media/ -------
# Whole directory on the SSD: database, Metadata/ (25 GB of posters) and # The SQLite database is the most latency-sensitive thing on the box and
# Media/ (337 GB of migrated preview cache). ~364 GB in ~440 GB usable. # belongs on flash. Metadata/ (25 GB of posters) rides along. The 337 GB
# Fully supported layout — no split, no bind-mount trickery. # Media/ preview cache does NOT — see the bind below.
- type: bind - type: bind
source: /srv/plex/config source: /srv/plex/config
target: /config target: /config
# ---- PHASE 2 (post-soak, optional) ---------------------------------- # ---- Preview/thumbnail cache on the 3 TB ext4 disk — NOT the SSD ------
# Relocate the 337 GB preview cache to the 3 TB ext4 disk so future # Mike's call 2026-07-31: 337 GB is too large for the 500 GB SSD, so
# thumbnail growth (~28 MB per content-hour) stops consuming the SSD. # Media/ lives on /srv/data (the former D:, now ext4) from day one.
# Long-form syntax deliberately: the target path contains spaces, which # Long-form syntax deliberately: the target path contains spaces, which
# the short "a:b" form handles badly. Docker orders mounts by target # the short "a:b" form handles badly. Docker orders mounts by target
# depth, so this correctly lands inside the /config mount above. # depth, so this correctly lands inside the /config mount above.
# #
# Plex does NOT support relocating this directory. Enable it only after # Plex does NOT support relocating this directory natively — this bind
# running scripts/60-media-relocate.sh, which performs the move and then # mount is the mechanism. After first start, force thumbnail generation
# forces thumbnail generation on a single title to prove that writes # on one title to prove writes succeed across the filesystem boundary
# succeed across the filesystem boundary. Rollback is moving it back. # (EXDEV) — that failure mode can only be tested, not reasoned about.
# - type: bind
# - type: bind source: /srv/data/plex-media
# source: /srv/data/plex-media target: /config/Library/Application Support/Plex Media Server/Media
# target: /config/Library/Application Support/Plex Media Server/Media
# ---- NAS media, mounted at the SAME paths the database stores ------- # ---- NAS media, mounted at the SAME paths the database stores ---------
# The remap rewrites \\korval\X -> /mnt/nas/X, so the container must see # The remap rewrites \\korval\X -> /mnt/nas/X, so the container must see
# exactly /mnt/nas/X. Six separate entries rather than one bind of # exactly /mnt/nas/X. Six separate entries rather than one bind of
# /mnt/nas, because a plain bind does not carry the submounts beneath it. # /mnt/nas, because a plain bind does not carry the submounts beneath it.
# Read-only: Plex has no reason to write to the library, and the NAS # Read-only here AND at the mount AND at the Synology — the mediabox NAS
# account is read-write. # account has no write permission on the library shares. media_pc (the
# box's write share) is deliberately not exposed to Plex.
- type: bind - type: bind
source: /mnt/nas/media source: /mnt/nas/media
target: /mnt/nas/media target: /mnt/nas/media