Cache used space is a lot more than the sum of the files on the cache

[Husker_N7242C]

Hi guys,

 

As the title says, my cache drive is nearly full but there is no where near 750GB of files on it. Any ideas why and how to rectify?

 

Here are some screenshots from Krusader and the GUI

 

 

 

 

[trurl]

attach diagnostics to your NEXT post in this thread

[trurl]

Default raid1 for 3x250 gives 375

 

https://carfax.org.uk/btrfs-usage/?c=2&slo=1&shi=1&p=0&dg=1&d=250&d=250&d=250

[trurl]

https://wiki.unraid.net/Manual/Storage_Management#Pool_Modes

 

https://wiki.unraid.net/Manual/Storage_Management#Change_Pool_RAID_Levels

[trurl]

 

 

[Husker_N7242C]

@trurl

nas-diagnostics-20221216-2350.zip

[trurl]

Looks like you have raid1 pool cache, 3x250 = 375 as I already noted

 

And another raid1 pool cache_vms, 2x500 = 500.

 

raid1 is a mirror.

 

Sounds like you are expecting to use the total capacity of all drives in cache, which would require raid0 (if all are the same size) or single mode if different sizes in the pool. No redundancy with either of those modes.

 

 

[Husker_N7242C]

14 minutes ago, trurl said:

Default raid1 for 3x250 gives 375

I've used more than 375GB, it holds about 430GB when "full" at the moment.

The GUI shows "Size 750GB"

[trurl]

Something must have happened when you tried to convert it to raid0. I'll have to let @JorgeB take a look.

[Husker_N7242C]

1 minute ago, trurl said:

Something must have happened when you tried to convert it to raid0

Thanks. I thought it was RAID0 from the start. 

Just prior to posting I clicked "perform full balance", but then cancelled after reading forums and realising that it wasn't going to help. I wasn't attempting to change the RAID level.

[trurl]

raid1 is default.

 

After you get cache fixed up, your system share has files on the array.

[JorgeB]

Any vdisks or other image type files there can grow with time if not trimmed/unmapped, do you have those type of files there?

[Husker_N7242C]

28 minutes ago, JorgeB said:

Any vdisks or other image type files there can grow with time if not trimmed/unmapped, do you have those type of files there?

G'Day @JorgeB,

All VM vdisks are on the other cache pool. The docker image, System folder, appdata and a few folders waiting for mover are all that is on this cache pool. All folders had been selected when I grabbed the total file size in Krusader. 

[JorgeB]

Just the docker image should not account for that, unless it's a large image, could be appdata, only way to know is to move elsewhere and then move back, docker image is easy to just recreate.

[JorgeB]

Also note that not sure Krusader shows the correct stats for btrfs, go to shares and click on compute to see if it's the same.

[Husker_N7242C]

I finally worked it out. It was the lancache container's cache. It reported as practically empty but was hundreds of gigs. I moved to the array for now and will have a look at how to manage it's size better, assuming that it knows its own cached website data size correctly.
Thanks @JorgeB & @trurl for trying to give me a hand!

[Husker_N7242C]

Just now, Husker_N7242C said:

lancache container's cache

(as in its cache of websites and steam games, not its appdata)