Peeling Back the Layers of Storage
Talkat Open Source Summit Europe 2022 · on Thursday, 2022-09-15· at 11:55· Liffey B Part 2 (Level 1), Convention Centre Dublin, Spencer Dock, N Wall Quay, North Wall Dublin 1, D01 T1·
summary
Linux storage unpacks into concrete layers: physical devices that lie about 512 vs 4K sectors and SMR behavior, a transport layer (SATA/SCSI/NVMe), a block layer with IO queues and partition alignment (partitions commonly start at 2048), and stacked components like MD raid, LUKS encryption, dm-cache and drbd that expose a single block device. A real server example uses 13 disks, four block layers, zram swap, tmpfs mounts and multiple bind mounts; on-disk self‑encryption is untrusted and backups (Borg) are mandatory.
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chapters (8)
- 0:00Intro
- 1:20Storage noun
- 4:30A word on ZFS on Linux
- 15:49Physical
- 21:53Disk Partitioning
- 27:37Device Mapper / LVM / Encryption
- 38:22Disk Caching and SWAP!
- 42:06Bind mounts, Symlinks, and Reflinks
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