I have a 8TB plex setup (x2 4TB drives, no redundance but running in an array) and a 250GB SSD 2.5in cache drive, the drives are pure Nvme drives and the file system is xfs.

Today I hit an issue that he drives are reporting as full, and I saw that the drives have a critical notice setup (which I'm assuming is linked to the reservation amount). Each disk is set to 90%, but it is greyed out.

A couple of questions:

 

• Default critical disk utilization threshold - I've set this to 98% in the Disk Settings, but its made no difference to the issue. Where do I set the actual reservation rather than just the notification and do I need to power cycle my Unraid server?
• Do I need to keep a reserve? Its not used for anything baring transferring media files to and then replaying them in read-only mode.

 

Global is just the default warnings but you can set per drive thresholds by clicking on the drive name on the main page.

 

It's good to leave some free space because in case the filesystem corrupts at some point xfs_repair will need free space or the repair will fail. There isn't really a decent estimation of how much that is but I tend to leave 100GB free on my (16TB) drives.

Edited July 17, 20241 yr by Kilrah

Thanks, for the info, I'll leave a good 50GB on my 8TB drives, that makes sense.

I keep hitting an blocker with my disks. I've changed the size from 90% to 98% utilisation but I still get a no space left on device warning. I've shut down my disk array and started it back up. Do I need to clear any other settings

rsync: [receiver] mkstemp "/mnt/user/Media/futsal20240716.mov.dbVC6R" failed: No space left on device (28)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1336) [sender=3.2.7]

What you changed is just information, it doesn't actually do anything. You need to check the minimum free space in every share and pool settings, those are actual limits.

Thanks, I've updated against each disk the Critical disk utilization threshold (%)... http://10.0.0.1/Main/Settings/Device?name=disk1 & http://10.0.0.1/Main/Settings/Device?name=disk2

1 hour ago, enhanced-vernacular6115 said:

Thanks, I've updated against each disk the Critical disk utilization threshold (%)... http://10.0.0.1/Main/Settings/Device?name=disk1 & http://10.0.0.1/Main/Settings/Device?name=disk2

As was mentioned that just affects the point at  which Unraid informs you that the disk has reached that threshold - it does not otherwise affect things.

 

You also need to set the minimum Free Space value for each share that uses the array to something you are happy with as when the free space on a drive falls below that value Unraid will stop writing to that drive regardless of what you have set for the warning or critical utilisation values on each disk.

Thanks, I'm struggling to find the settings for this. If I got to settings and click on the individual disks, it only gives me that option as per my last message.

 

1 minute ago, enhanced-vernacular6115 said:

Thanks, I'm struggling to find the settings for this. If I got to settings and click on the individual disks, it only gives me that option as per my last message.

 

That will be because this setting is on the shares - not the disks.

Thanks, I found the setting.