Additional Resources:
Why The ZFS Copy On Write File System Is Better Than A Journaling One
Explaining ZFS LOG and L2ARC Cache: Do You Need One and How Do They Work?
Level1Techs ZFS METADATA: SPECIAL DEVICE AND YOU!
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Time Stamps 
00:00 
ZFS Dataset and ZVOL explained
01:04 ZFS Pool Structure & Special VDEV Types
02:20 Zvol Features
05:18 Dataset Features
08:07 Creating a zvol in TrueNAS
09:18 zvol in TrueNAS virtualization
09:45 zvol use in TrueNAS iSCSI
10:59 Dataset use in TrueNAS iSCSI
#zfs #storage #truenas