ZPools

ZPools Configuration

This page documents all ZPools configured on the TrueNAS server, including their mirrors and individual drives.

ZPool Overview

ZPool Name	Size	Allocated	Free	Capacity	Dedup	Status	Last Scrub	Purpose
Mir1	9.98TB	8.86TB	1.12TB	88%	1.25x	ONLINE	March 27, 2025	Primary data storage
freenas-boot	55.5GB	20.3GB	35.2GB	36%	1.00x	ONLINE	April 9, 2025	System boot pool

Detailed ZPool Configuration

Mir1 (Primary Storage)

Configuration: 6 mirror vdevs with 2 drives each, plus a cache device Size: 9.98TB total (8.86TB used, 1.12TB free, 88% capacity) Deduplication Ratio: 1.25x Fragmentation: 58% Status: ONLINE Last Scrub: Completed on Thu Mar 27 13:46:51 2025 (repaired 0B in 13:45:53 with 0 errors)

mirror-0

Drive	State	Read Errors	Write Errors	Checksum Errors
gptid/4f7b78d1-d17d-11ef-8a75-b496913a6fde	ONLINE	0	0	0
gptid/4cffd486-d1af-11ef-8a75-b496913a6fde	ONLINE	0	0	0

mirror-1

Drive	State	Read Errors	Write Errors	Checksum Errors
gptid/017ac5ca-9656-11eb-bb15-d45d643eabc1	ONLINE	0	0	0
gptid/5a9d8d43-9778-11eb-bb15-d45d643eabc1	ONLINE	0	0	0

mirror-3

Drive	State	Read Errors	Write Errors	Checksum Errors
gptid/0f3f574a-9748-11eb-bb15-d45d643eabc1	ONLINE	0	0	0
gptid/dea802f8-9655-11eb-bb15-d45d643eabc1	ONLINE	0	0	0

mirror-4

Drive	State	Read Errors	Write Errors	Checksum Errors
gptid/4b17ad79-13e6-11ef-af29-b496913a6fde	ONLINE	0	0	0
gptid/f613b9f9-1407-11ef-af29-b496913a6fde	ONLINE	0	0	0

mirror-5

Drive	State	Read Errors	Write Errors	Checksum Errors
gptid/b9bb4736-6a05-11ee-8632-b496913a6fde	ONLINE	0	0	0
gptid/7e75d4d4-69eb-11ee-8632-b496913a6fde	ONLINE	0	0	0

mirror-6

Drive	State	Read Errors	Write Errors	Checksum Errors
gptid/53cb5f22-14a9-11f0-ae6a-b496913a6fde	ONLINE	0	0	0
gptid/53c00b9b-14a9-11f0-ae6a-b496913a6fde	ONLINE	0	0	0

Cache Device

Drive	State	Read Errors	Write Errors	Checksum Errors
gptid/21b92d71-98b9-11eb-8ea4-d45d643eabc1	ONLINE	0	0	0

freenas-boot (System Boot Pool)

Configuration: Single disk Size: 55.5GB total (20.3GB used, 35.2GB free, 36% capacity) Deduplication Ratio: 1.00x Fragmentation: 2% Status: ONLINE Last Scrub: Completed on Wed Apr 9 03:46:06 2025 (repaired 0B in 00:01:06 with 0 errors) Note: Some supported features are not enabled on the pool. The pool can still be used, but some features are unavailable. Enable all features using 'zpool upgrade'.

Drive	State	Read Errors	Write Errors	Checksum Errors
ada0p2	ONLINE	0	0	0

ZPool Health Status

To check the current status of all ZPools, run:

zpool status

ZPool Size and Allocation

To view size and allocation information for all ZPools, run:

zpool list

ZFS Datasets

The TrueNAS server has the following dataset structure:

Mir1 Datasets

Dataset	Used	Available	Referenced	Mount Point	Purpose
Mir1	8.92TB	1019GB	396KB	/mnt/Mir1	Root dataset
Mir1/Artists	3.06TB	1019GB	3.01TB	/mnt/Mir1/Artists	Artist files
Mir1/Documents	128KB	1019GB	128KB	/mnt/Mir1/Documents	Document storage
Mir1/Files	888GB	1019GB	888GB	/mnt/Mir1/Files	General file storage
Mir1/Music	18.7MB	1019GB	18.7MB	/mnt/Mir1/Music	Music files
Mir1/Photography	245GB	1019GB	245GB	/mnt/Mir1/Photography	Photography files
Mir1/Pictures	172KB	1019GB	172KB	/mnt/Mir1/Pictures	Picture storage
Mir1/Projects	35.5GB	1019GB	35.5GB	/mnt/Mir1/Projects	Project files
Mir1/media	4.71TB	1019GB	4.70TB	/mnt/Mir1/media	Media storage
Mir1/sonolux	88KB	1019GB	88KB	/mnt/Mir1/sonolux	Sonolux data
Mir1/proxy-cache	348KB	1019GB	348KB	/mnt/Mir1/proxy-cache	Proxy cache

Jail Datasets

Dataset	Used	Available	Referenced	Mount Point	Purpose
Mir1/iocage	3.41GB	1019GB	65.5MB	/mnt/Mir1/iocage	iocage jail management
Mir1/jails	2.99GB	1019GB	54.9MB	/mnt/Mir1/jails	Jail storage

System Datasets

Dataset	Used	Available	Referenced	Mount Point	Purpose
Mir1/.system	622MB	1019GB	120KB	legacy	System data
Mir1/.system/configs-*	44.1MB	1019GB	43.1MB	legacy	System configurations
Mir1/.system/cores	352KB	1024MB	96KB	legacy	Core dumps
Mir1/.system/rrd-*	565MB	1019GB	39.0MB	legacy	RRD statistics
Mir1/.system/samba4	2.18MB	1019GB	252KB	legacy	Samba configuration
Mir1/.system/services	96KB	1019GB	96KB	legacy	Services data
Mir1/.system/syslog-*	9.46MB	1019GB	5.46MB	legacy	System logs
Mir1/.system/webui	96KB	1019GB	96KB	legacy	Web UI data

freenas-boot Datasets

The boot pool contains multiple boot environments for TrueNAS system updates:

Dataset	Used	Available	Referenced	Mount Point	Notes
freenas-boot	20.3GB	33.5GB	64KB	none	Boot pool
freenas-boot/ROOT	20.2GB	33.5GB	29KB	none	Boot environments
freenas-boot/ROOT/13.0-U6.7	20.2GB	33.5GB	1.30GB	/	Current boot environment
freenas-boot/grub	7.17MB	33.5GB	7.17MB	legacy	Boot loader

The boot pool contains multiple boot environments from previous TrueNAS versions, allowing for rollback if needed. The current active boot environment is 13.0-U6.7.

To view the complete dataset structure, run:

zfs list

ZPool Performance Statistics

To view performance statistics for all ZPools, run:

zpool iostat -v

Note: This documentation is based on the zpool status, list, and zfs list outputs from April 12, 2025.