Applicable Products
All QNAP NAS models
Scenario
During a RAID 1 rebuild, an unrecoverable read error on the source drive that remains in the RAID group may stop the rebuild and leave the storage pool or volume in a Degraded state. Even if the replacement drive shows Good, this does not mean that it is safe to start the rebuild again.
In this case, the RAID 1 rebuild on the NAS stopped after the source drive reported UNRECOVERED READ ERROR / Medium error. The storage pool remained accessible through the old drive, which had a SMART warning. Although the replacement drive showed Good, the rebuild screen showed no available disks.
Solution
At this point, prioritize protecting any data that is still readable and ask QNAP Support to assess the next steps.
Back Up Readable Data Immediately
If you do not have a confirmed backup and the data on the NAS is still readable, immediately back up important data to a destination outside the NAS, such as an external storage device, another NAS, or a cloud backup service with appropriate retention and restore capabilities. If you already have a backup, confirm that the latest backup completed successfully and that its files can be accessed or restored.
- Prioritize data that cannot be replaced or obtained again.
- Store the backup outside the current RAID group so that a failure of the source storage pool does not also make the backup inaccessible.
- After the backup completes, check the job log and open or restore sample files to verify that the backup is usable.
Important
RAID 1 provides drive redundancy; it is not a substitute for data backups. If the array is degraded or a source drive has read errors, another drive failure may make the data inaccessible.
Note
Real-time synchronization is not necessarily equivalent to a backup with version retention. Confirm that the destination retains recoverable older versions and that the latest synchronization or backup completed successfully.
Contact QNAP Support
After backing up as much data as possible, contact QNAP Support to confirm the next steps. Provide the NAS model, QTS version, storage pool and RAID status, drive bay locations and replacement sequence, relevant error messages, and SMART or system logs so that Support can assess the situation.
Until you receive instructions from Support, avoid repeatedly starting the RAID rebuild, removing or reinserting drives, initializing or formatting drives, deleting the storage pool, or manually modifying the RAID. These actions may increase the risk of making the data unrecoverable. Keep the drives in their original bay positions and preserve the current configuration as much as possible.
Maintain Regular Backups
Schedule regular backups to a destination outside the NAS and enable an appropriate version-retention or rotation policy. Check backup jobs regularly and test file restoration. Do not wait until a drive fails or a RAID group becomes degraded to start backing up your data.
適用產品
所有 QNAP NAS 型號
情境
在 RAID 1 重建期間，來源磁碟發生無法恢復的讀取錯誤，可能會停止重建並使儲存空間儲存池或磁碟區處於降級狀態。即使替換磁碟顯示為良好，這並不意味著可以安全地重新開始重建。
在這種情況下，NAS 上的 RAID 1 重建在來源磁碟報告UNRECOVERED READ ERROR / Medium error後停止。儲存空間儲存池仍可透過舊磁碟存取，但該磁碟有 SMART 警告。雖然替換磁碟顯示為良好，但重建畫面顯示沒有可用磁碟。
解決方案
此時，應優先保護任何仍可讀取的資料，並請 QNAP 支援服務評估下一步措施。
立即備份可讀取的資料
如果您沒有確認的備份且 NAS 上的資料仍可讀取，請立即將重要資料備份到 NAS 以外的目的地，例如外部儲存空間裝置、另一台 NAS 或具有適當保留和還原功能的雲端備份服務。如果您已經有備份，請確認最新的備份已成功完成，並且可以存取或還原其檔案。
- 優先處理無法替代或再次獲得的資料。
- 將備份儲存在當前 RAID 群組之外，以免來源儲存空間儲存池故障時，備份也無法存取。
- 備份完成後，檢查工作日誌並開啟或還原範例檔案，以確認備份可用。
重要
RAID 1 提供磁碟冗餘，但不能替代資料備份。如果陣列降級或來源磁碟有讀取錯誤，另一個磁碟故障可能會使資料無法存取。
注意
即時同步不一定等同於具有版本保留的備份。確認目的地保留可恢復的舊版本，並且最新的同步或備份已成功完成。
聯絡 QNAP 支援
在儘可能多地備份資料後，聯絡QNAP 支援以確認下一步。提供 NAS 型號、QTS 版本、儲存空間儲存池和 RAID 狀態、磁碟槽位置和更換順序、相關錯誤訊息，以及 SMART 或系統日誌，以便支援人員評估情況。
在收到支援指示之前，避免反覆啟動 RAID 重建、移除或重新插入磁碟、初始化或格式化磁碟、刪除儲存空間儲存池或手動修改 RAID。這些操作可能增加資料無法恢復的風險。盡量保持磁碟在原始槽位，並保留當前配置。
維持定期備份
安排定期備份到 NAS 之外的目的地，並啟用適當的版本保留或輪替策略。定期檢查備份工作並測試檔案還原。不要等到磁碟故障或 RAID 群組降級後才開始備份資料。
