Proxmox VE 4.x 中文初階學習手冊
參考出處：https://www.freebsd.org/doc/zh_TW/books/handbook/zfs-zpool.html
以下是原文：
19.3.6. 處理故障裝置
當儲存池中的磁碟故障，該故障硬碟所屬的 vdev 便會進入降級 (Degraded) 狀態，所有的資料仍可使用，但效能可能會降低，因為遺失的資料必須從可用的備援資料計算才能取得。要將 vdev 恢復完整運作的狀態必須更換故障的實體裝置。然後 ZFS 便會開始修復 (Resilver，古代鏡子的修復稱 Resilver) 作業，會從可用的備援資料計算出故障磁碟中的資料並寫入到替換的裝置上。完成後 vdev 便會重新返回上線 (Online) 的狀態。
若 vdev 沒有任何備援資料或有多個裝置故障，沒有足夠的備援資料可以補償，儲存池便會進入故障 (Faulted) 的狀態。
更換故障的磁碟時，故障磁碟的名稱會更換為裝置的 GUID，若替換裝置要使用相同的裝置名稱，則在 zpool replace 不須加上新裝置名稱參數。
使用 zpool replace 更換故障的磁碟：
# zpool status pool: mypool state: DEGRADED status: One or more devices could not be opened. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Attach the missing device and online it using 'zpool online'. see: http://illumos.org/msg/ZFS-8000-2Q scan: none requested config: NAME STATE READ WRITE CKSUM mypool DEGRADED 0 0 0 mirror-0 DEGRADED 0 0 0 ada0p3 ONLINE 0 0 0 316502962686821739 UNAVAIL 0 0 0 was /dev/ada1p3 errors: No known data errors # zpool replace mypool 316502962686821739 ada2p3 # zpool status pool: mypool state: DEGRADED status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scan: resilver in progress since Mon Jun 2 14:52:21 2014 641M scanned out of 781M at 49.3M/s, 0h0m to go 640M resilvered, 82.04% done config: NAME STATE READ WRITE CKSUM mypool DEGRADED 0 0 0 mirror-0 DEGRADED 0 0 0 ada0p3 ONLINE 0 0 0 replacing-1 UNAVAIL 0 0 0 15732067398082357289 UNAVAIL 0 0 0 was /dev/ada1p3/old ada2p3 ONLINE 0 0 0 (resilvering) errors: No known data errors # zpool status pool: mypool state: ONLINE scan: resilvered 781M in 0h0m with 0 errors on Mon Jun 2 14:52:38 2014 config: NAME STATE READ WRITE CKSUM mypool ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 ada0p3 ONLINE 0 0 0 ada2p3 ONLINE 0 0 0 errors: No known data errors