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#storage (4)

Concepts (1)

Filesystems

The OS-layer abstraction that turns a flat block device into named, permissioned, hierarchical files — covering inodes, paths, permissions, journaling, and copy-on-write.
os storage posix permissions capabilities inode mount journaling copy-on-write web-researched

Cheat sheets (3)

DFSMShsm — Hierarchical Storage Manager

Migrate, recall, back up, and recover datasets across ML0/ML1/ML2 tiers with TSO H-commands and ARC operator commands; bulk-recall recipes, recall timing, and audit messages.
zos mainframe hsm dfsmshsm storage datasets sms web-researched

df, du & duf — Disk Usage

Check filesystem free space (df), measure directory sizes (du), and view a colourful disk overview (duf). Covers all key flags, human-readable output, modern alternatives (dust, gdu, ncdu), and common sysadmin recipes.
df du duf dust ncdu gdu disk filesystem storage cli web-researched

Filesystems — Inodes, Links, Journaling, ext4/XFS/Btrfs/ZFS/APFS/NTFS

Core filesystem concepts every operator should know: inodes, directory structure, hard vs symbolic links, journaling, copy-on-write, and a head-to-head of ext4, XFS, Btrfs, ZFS, APFS, and NTFS with mount options and pitfalls.
filesystem inode ext4 xfs btrfs zfs apfs ntfs mount journaling links storage