Memory left for persistence

[Menard]

hi

I use persistence on Linux Mint 21 with a 512 MB persistence dat file, but I get some warning from the system about memory as 5 MB left warning, or less, and I don't understand what it means, is this related to the persistence dat file size too low ?
If yes, how can I use all 512 MB ? though I delete thumbnails cache, browser cache, journals etc all that ca be involved
If no, how can I check the place left in the persistence dat file ?

[Menard]

Nobody ?

[Steve2926]

try df command ?
Persistence files tend to fill up quickly. You need at least 1GB and preferably 4GB if you use it a lot.