No free space on logical volume group

[marmiteturkey]

I'm getting this message when I try to run first aid on the 2tb fusion drive in my 2016 27in iMac:

'THere is not enough free space in the Core Storage Logical Volume Group for this operation'.

THere's 900GB+ free on the drive itself - I can't repair the drive, even if I reboot into recovery. Anything online that looks like a fix involves wiping the drive and setting it up again. I have backups but I'd obviously rather not have to go through all that.

Any ideas?

 

[JohnDS]

Is this a fusion drive? Is it an encrypted drive?

 

[DeltaMac]

Do you have File Vault turned on?
If you do, turn File Vault off, then try your drive repair.

 

[marmiteturkey]

It is a fusion drive. File vault is turned off.

 

[DeltaMac]

Ah, OK.

Other than running Disk Utility/First Aid, are you actually having a problem with your iMac?
There might be other solutions if you can describe the real problem...

 

[JohnDS]

I suspect you are going to have to split the fusion drive, reformat and then create a new fusion drive.

 

[DeltaMac]

If there's no particular problem, then no reason to waste time "fixing" a system, when it is not broken.