df
The df (Disk Filesystem) command is used to display information about the total, used, and available disk space on all mounted filesystems in a Linux environment. It helps system administrators and users monitor storage usage and identify disks that may be reaching capacity.
df -khOption | Description |
-k | Displays filesystem information in 1024-byte (KB) blocks. |
-h | Prints sizes in a human-readable format (e.g., KB, MB, GB, TB). |
This combination (-kh) provides an easy-to-read summary of disk usage across all mounted partitions.
Example Output
Key Mount Points from Example Output
Mount Point | Filesystem Type / Source | Purpose / Description |
/ | Local disk (/dev/mapper/xcatvg-root) | Root filesystem; operating system and core binaries. |
/boot, /boot/efi | Local partitions (/dev/sda1, /dev/sda2) | Boot and EFI partitions for the OS kernel and bootloader. |
/mnt/beegfs-home | BeeGFS | Central user home directories for cluster users. |
/mnt/beegfs-scratch | BeeGFS | High-performance scratch space for temporary job data. Not backed up. |
/opt/ohpc/pub | NFS mount (ibapp:/drbd/pub) | Shared public applications and software repositories. |
/install | NFS mount (xcat-mgmt:/install) | XCAT installation and provisioning directory. |
/kuttam_fg | NFS (ibnfsgw:/srv/kuttam_fg) | Dedicated storage for the Kuttam team |
/datasets | NFS (ibnfsgw:/srv/datasets) | Shared datasets available to all users. |
/userfiles | NFS (ibnfsgw:/srv/userfiles) | User-provided datasets or project data. |
/frozen | NFS (ibnfsgw:/srv/frozen) | Archived or frozen data for long-term retention. |
/singularity | NFS (ibtmpfs:/srv/tmp) | Temporary space for Singularity container images. |
/run/user/* | Temporary virtual memory (tmpfs) | Per-user runtime directories for sessions. Automatically cleared. |