Notes on Zoned Storage / Host-Managed SMR

Note: article date will be updated as data is updated

SATA Chipset Support

Based on first-hand testing…

Works? System Chipset Storage Device OS
❌ No Asustor AS6704T ASM1164 Seagate Exos X26z / ST25000NM000E Fedora 40 IoT
✅ Yes Asustor AS6602T Celeron/Pentium Silver SATA Controller (rev 06) Seagate Exos X26z / ST25000NM000E Fedora 40 IoT

Zoned storage on Fedora IoT

f2fs has a max volume size of 16TB and we have 25TB drives, so we’ll use btrfs instead.

First, install btrfs:

# rpm-ostree install btrfs-progs && systemctl reboot

Second, make volume:

# mkfs.btrfs -m single -d single /dev/sda
btrfs-progs v6.8.1
See https://btrfs.readthedocs.io for more information.

Zoned: /dev/sda: host-managed device detected, setting zoned feature
Resetting device zones /dev/sda (93136 zones) ...
NOTE: several default settings have changed in version 5.15, please make sure
      this does not affect your deployments:
      - DUP for metadata (-m dup)
      - enabled no-holes (-O no-holes)
      - enabled free-space-tree (-R free-space-tree)

Label:              (null)
UUID:               9da51abc-3f37-47cf-8eb4-511645852b84
Node size:          16384
Sector size:        4096	(CPU page size: 4096)
Filesystem size:    22.74TiB
Block group profiles:
  Data:             single          256.00MiB
  Metadata:         single          256.00MiB
  System:           single          256.00MiB
SSD detected:       no
Zoned device:       yes
  Zone size:        256.00MiB
Features:           extref, skinny-metadata, no-holes, free-space-tree, zoned
Checksum:           crc32c
Number of devices:  1
Devices:
   ID        SIZE  ZONES  PATH
    1    22.74TiB  93136  /dev/sda
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