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#storage

50 posts27 participants1 post today

💾 ZFS ARC Cache Explained 💾

ZFS uses RAM as a powerful cache called the ARC (Adaptive Replacement Cache) to speed up disk reads and metadata operations.

It looks like ZFS “eats” RAM — but it’s actually putting your memory to work, caching data for blazing-fast access.

⚠️ Important: ARC is not a memory leak!
It dynamically adjusts — if apps need RAM, ARC frees it instantly.

🛠️ You can set a limit with zfs_arc_max so ZFS won’t take all your memory.

✅ Properly tuned, ARC boosts performance without starving your system.

So don’t fear the RAM usage—embrace the cache! 🚀