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.
适用产品
所有 QNAP NAS 型号
场景
在 RAID 1 重建过程中，源驱动器上的不可恢复读取错误可能会导致重建停止，并使存储池或卷处于降级状态。即使替换驱动器显示良好，这并不意味着可以安全地重新开始重建。
在这种情况下，NAS 上的 RAID 1 重建在源驱动器报告UNRECOVERED READ ERROR / Medium error后停止。存储池仍可通过旧驱动器访问，该驱动器有 SMART 警告。虽然替换驱动器显示良好，但重建屏幕显示没有可用磁盘。
解决方案
此时，应优先保护任何仍可读取的数据，并请求 QNAP 支持评估下一步措施。
立即备份可读取的数据
如果您没有确认的备份，并且 NAS 上的数据仍可读取，请立即将重要数据备份到 NAS 之外的目的地，例如外部存储设备、另一台 NAS 或具有适当保留和恢复功能的云备份服务。如果您已有备份，请确认全新备份已成功完成，并且可以访问或恢复其文件。
- 优先处理无法替代或重新获取的数据。
- 将备份存储在当前 RAID 组之外，以免源存储池故障时备份也无法访问。
- 备份完成后，检查作业日志并打开或恢复示例文件，以验证备份是否可用。
重要
RAID 1 提供驱动器冗余；它不是数据备份的替代品。如果阵列降级或源驱动器出现读取错误，另一个驱动器故障可能会导致数据无法访问。
注意
实时同步不一定等同于具有版本保留的备份。确认目标保留可恢复的旧版本，并确保全新的同步或备份已成功完成。
联系 QNAP 支持
在尽可能多地备份数据后，联系QNAP 支持以确认下一步。提供 NAS 型号、QTS 版本、存储池和 RAID 状态、驱动器托架位置和更换顺序、相关错误信息以及 SMART 或系统日志，以便支持人员评估情况。
在收到支持人员的指示之前，避免反复启动 RAID 重建、移除或重新插入驱动器、初始化或格式化驱动器、删除存储池或手动修改 RAID。这些操作可能增加数据无法恢复的风险。尽量保持驱动器在其原始托架位置，并尽可能保留当前配置。
保持定期备份
安排定期备份到 NAS 之外的目的地，并启用适当的版本保留或轮换策略。定期检查备份作业并测试文件恢复。不要等到驱动器故障或 RAID 组降级后才开始备份数据。
