Failed 'Could not write metadata. Unknown file I/O error. (1) ?

[Dave Eagle]

I have Lightroom running on an iMac with the catalogue on the iMac, but the RAW files and XMP files written to a NAS drive.

I am getting a number of metadata write failures on each set of images I process.

Current example out of 22 images, 8 have failed with the above error.

Whilst some have updated, those that fail either have a metadata status of 'Unknown', or  'Has been changed'.

When I retry the metadata save, they all go to 'Unknown'.

The only workaround that works more often than not, is to delete the xmp file on the disk, and then re-save the metadata.

This is increasingly a problem, as I have to run a smart collection of images with suspect metadata status values, and attempt to fix them.

Please note that this is Lightroom 6, but there doesnt seem to be a forum for this version any longer...

All help very much appreciated.

[dj_paige]

This feels to me like it is a network malfunction, or a hard disk malfunction.

[Dave Eagle]

Hmmm not sure. There is a secondary behaviour in so far as once the metadata write has failed in a given Lightroom session, thats pretty much it unless I delete the XMP file and save a new xmp file. However, close that Lightroom session and start a fresh Lightroom session, then select those images again and save/write metadata again, most if not all will write the changes to the xmp files. If any fail, then closing the session and starting Lightroom again and re-saving the metadata changes for the affected images usually succeeds.

Whilst being a pain, keeping a smart collection of 'Metadata Issues' allows me to keep tabs on the failures and re-process the collection whenever I open up Lightroom so that I can stay on top of the problem.

I only discovered this after I posted the above topic, so at least its a useful workaround.....

[dj_paige]

This still feels to me like a network or hard drive problem, perhaps intermittent. You would be wise to consider that as a possible explanation and investigate.

[Birger_S]

I don't think it's a Network or NAS Problem.
Because the Pictures, same project, before or past the faulty Picture didn't have these issue.
And after quitting LR CC (8.1 Build 1200465) I could resave the metadata.

I use am MacBookPro 2017 OSX 10.14.2 and Synology NAS

[SHAHRUKH22655692pbfh]

Try to Copy the catalog on local drive or desktop if your catalog is on external drive.