cp cannot stat input/output error during backup to USB

[Lamda]

I am reaching out to the community as I have a persistent issue with my backup job that I cannot troubleshoot further.  There is little I could find through googling around as well...

I have attached a USB drive on the rear USB port of my ReadyNAS Pro Pioneer Edition, that is formatted on EXT4 (through the ReadyNAS Frontview USB Storage panel).

I have then proceeded to create a full backup job on my entire volume.  This kind of backup I was able to run in the past without problems/errors. This time around though I get a long list of "cp: cannot stat" error messages on individual files/folders and at the end of each error message, it says "input/output error".

The details of my machine:

Model:	ReadyNAS Pro Pioneer Edition [X-RAID2]
Serial:
Firmware:	RAIDiator 4.2.28
Memory:	1024 MB [4-5-5-15 DDR2]
IPv4 address: 1:	???.???.???.??
IPv4 address: 2:	Not Connected
Volume C:	Online, X-RAID2, 2 disks, 77% of 1846 GB used

Could someone please explain what exactly this error means and how I can eliminate it?

[JennC]

Hello Lamda,

Can you still access and write to the USB disk when it is mounted straight to a computer?

Regards,

[Lamda]

Hi there,

Sorry for the very late reply - I've been very very busy over the last months.

I tried creating a new folder in my USB disk volume, directly from Finder on my Mac.  It actually worked and the new folder was created.  Later on, I tried to delete it and that worked also.

If am wondering whether this has to do with the constant failure of the Volume Consistency Check task, that I have enabled to run regularly.  It is rather sluggist (old Max, 4GBs of RAM...).  Why do I get those every single time I invoke the Volume Consistency Check and is there a way I can eliminate them?

Thanks,

L.

[Lamda]

Hello,

is there perhaps anyone that can help with my query in this thread?  The problem still persists and I can't really work out why that happens...

[StephenB]

Have you checked the SMART status of the internal disk?  You can post the stats here if you aren't sure how to interpret them.

Do you have access to a windows PC?  If so, you can try powering down the NAS, removing the disk and testing it in a windows PC with WDC's lifeguard tool.  You can test the USB drive that way also (using seatools for seagate drives).