Defragging my old Dell's UEFI NVRAM

Defragging my old Dell's UEFI NVRAM 2025-02-22 I’m setting up an old Dell box (2011-era tech). I was migrating to some new boot drives and setting up grub on them again. Got to the point of deleting the old boot entries and adding new ones, and got an error like Could not prepare boot variable: No space left on device . Weird, because there weren’t that many EFI variables, but df -h also reported that efivars was full: efivarfs 64K 60K 0K 100% /sys/firmware/efi/efivars funky. It wasn’t due to a glut of boot entries either; I’m pretty keen on keeping the old ones cleared out, so we only had a few on here. Well, I thought maybe there was a lot of dead space in the nvram that wasn’t in use but also couldn’t be allocated. So I booted an EFI shell, and did this: fs0: dmpstore -s efi-vars dmpstore -d dmpstore -l efi-vars Please be careful with these commands, it worked for me but for all I know it might brick your setup. Check help dmpstore first. What this does is: switch to fs0 fi ... Read full article.