Freebsd Mastery Advanced Zfs Pdf

Beginners treat vdevs as black boxes. Advanced users know the topology. The book dedicates chapters to the three types of vdevs:

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Pro Tip: If the price is a barrier, check your local library’s inter-library loan or academic database. Many university tech libraries have this title in OverDrive or EBSCO. freebsd mastery advanced zfs pdf

Snapshots are read-only copies of a dataset at a specific point in time. Clones, on the other hand, are writable copies of a snapshot.

# Create a snapshot
sudo zfs snapshot mypool/mydataset@snapshot1
# Create a clone from the snapshot
sudo zfs clone mypool/mydataset@snapshot1 mypool/myclone

Quotas limit the amount of space a dataset can use, while reservations guarantee a minimum amount of space. Beginners treat vdevs as black boxes

# Set a quota on a dataset
sudo zfs set quota=10G mypool/mydataset
# Set a reservation on a dataset
sudo zfs set reservation=5G mypool/mydataset

ZFS supports compression and deduplication, which can significantly reduce storage requirements.

# Enable compression on a dataset
sudo zfs set compression=on mypool/mydataset
# Enable deduplication on a dataset
sudo zfs set dedup=on mypool/mydataset

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Without the advanced book, you risk data loss (wrong ashift value), performance death (sync writes to a single disk), or security holes (unencrypted send over internet).