前陣子在 Hacker News 上看到「I only lost 10 minutes of data, thanks to ZFS (mastodon.social)」這篇，講他的硬碟故障，但是靠著 zrepl 每十分鐘將本地的 ZFS filesystem 同步一次到 NAS 上，所以他只掉了十分鐘的資料的故事…
Hacker News 上最熱的討論居然是在討論 WD 與 SanDisk 的 SSD disk issue，反倒不是這個想法或是 zrepl 這個工具…
看了一下這個方法還蠻有趣的，有需求的人好像是可以這樣搞沒錯…
Anyway，想當初 OpenZFS 剛出的時候，因為 license 是 CDDL 而被 FSF 認為無法與 GPLv2 相容，所以 Linux 這邊無法內建或是散佈 binary，想玩 ZFS 就得用 OpenSolaris 或是 porting 到 FreeBSD 的版本。
結果後來 Ubuntu 的法律顧問認為可以透過 kernel module (binary) 的方式散佈相容，在 Ubuntu 16.04 包進去後就開始盛行了…
而且當年記憶體 overhead (GB 等級) 要求對於 desktop 是個不能忽略的問題，現在回頭來看也不是大問題了，桌機與筆電常常都是 16GB+ 在跑…
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