LinuxFilesystem
I deleted a 40 GB log and df didn't change. Where did the space go?
rm removes a name, not the data. Why df and du disagree after deleting an open file, how lsof +L1 finds it, and how to get the space back without a reboot.
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Filesystem
Disks, inodes, permissions and the space that will not come back: filesystem incidents explained.
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DockerLinuxFilesystemSRE
Docker host out of disk but docker system df looks fine
A full Docker host is usually container logs, which docker system df does not count. Find the space with df and du, prune safely, and set log rotation.
LinuxFilesystem
"No space left on device" but df shows free space: the 3 causes, in the order to check
ENOSPC with a half-empty disk. Check inodes (df -i), then deleted-but-open files (lsof +L1), then ext4 reserved blocks (tune2fs) - what each looks like and how to fix it.