Synology NAS – mysterious IO error external USB HDD during Hyperbackup?

ReverendPByReverendP

Hello everyone,

I have an external USB HDD (1TB Toshiba USB 3.0, NTFS) on my Synology NAS (DS-218+ with DSM 7.1.1), which I use for a daily backup with HyperBackup.

For a few days now, this backup has always failed with the message that the target drive is not available:

 Failed to access the backup destination (Your disk has I/O error. Please refer to http://sy.to/hbioerr) Exception occurred while backing up data. (Your disk has I/O error. Please refer to http://sy.to/hbioerr) [User: root, Path: /volumeUSB2/usbshare/NAS_HyperBackup.hbk/Config/target_info.db, Reason: disk I/O error]

However, the contents of the USB drive can be accessed without any problems via the DSM File Manager, and checking the HDD on the Windows PC did not reveal any errors.

However, the Synology documentation assumes that an IO error means that the drive is no longer accessible, which is not the case here.

I'm pretty confused, does anyone have any idea what the reason could be or what else I could do?

(1 votes)
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iceberg3
iceberg3
2 years ago

First of all, you could safely remove the hard drive via the Synology Interface. Then you backup the data on your PC or on another disk, then you connect it to the NAS again.

Why backup to another disk? To avoid data loss.

And best try this: https://kb.synology.com/en-global/DSM/tutorial/What_should_I_do_if_the_message_IO_error_appears_when_using_Hyper_Backup_to_back_up_tasks_to_local_destinations

It says that you should perform a SMART test on the Synology Interface.

If the hard drive should be broken, you need to create a new one. You can find out by following the instructions.

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ReverendP
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ReverendP
2 years ago
Reply to  iceberg3

Okay, thanks for the tips. Try to perform a SMART test on Windows PC. SMART works in the DSM for external panels only when connected to eSATA.

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datarescue
datarescue
2 years ago

An I/O error occurs, for example, even in file system errors, so if there is a little inconsistency at the MFT, Linux (Synology) can no longer handle/will; Windows (Microsoft has developed NTFS now) but does not report any errors yet.

One attempt would therefore be to perform a chkdsk /f hard drive on Windows after the data has been backed up by the critical hard drive and then to re-use it on the Synology.

Or just use new hard drive and don’t think further

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