Process Summary Requirements: Storage pools and datasets created in Storage > Pools. Tasks > Replication Tasks > ADD Choose Sources Set the source location to the local system Use the file browser or type paths to the sources Define a Destination path Set the destination location to the local system …

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Perhaps the most important part about TrueNAS is the ability to efficiently store and share large amounts of data. The way this is accomplished is through setting up ZFS Pools. Creating a new Pool To set up a pool in TrueNAS, go to Storage > Pools and click ADD. Set Create a new pool and click CREATE POOL. First, …

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It is recommended to configure SSH and automatic dataset snapshots in TrueNAS before creating a remote replication task. This ensures that both systems can connect to each other and new snapshots are regularly available for replication. To streamline creating simple replication configurations, the replication wizard …

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A ZFS pool is required for creating a ZFS dataset. See Creating a new ZFS Pool. To create a dataset in the desired pool, go to Storage > Pools and click . Next, click Add Dataset. To quickly create a dataset with the default options, enter a name for the dataset and click SAVE. To see additional options for the …

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Requirements: Storage pools with datasets and data to snapshot. SSH configured with a connection to the remote system saved in System > SSH Connections. Dataset snapshot task saved in Tasks > Periodic Snapshot Tasks. Process Summary Go to Tasks > Replication Tasks, open the wizard, and select advanced …

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A ZFS pool must be created first to create a Zvol. See Creating a new ZFS Pool. To create a Zvol in the desired pool, go to Storage > Pools then click   and Add Zvol. To quickly create a Zvol with the default options, enter a name for the Zvol, a size, and click SAVE. To modify more advanced settings of the …

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ZFS is an advanced, modern filesystem that was specifically designed to provide features not available in traditional UNIX filesystems. It was originally developed at Sun with the intent to open source the filesystem so that it could be ported to other operating systems. After the Oracle acquisition of Sun, some of the …

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The system dataset stores debugging core files, encryption keys for encrypted pools, and Samba4 metadata such as the user/group cache and share level permissions. Change System Dataset To view the current location of the system dataset, go to System > System Dataset. The system dataset can be changed by selecting an …

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A scrub is the process of ZFS scanning through the data on a pool. Scrubs help to identify data integrity problems, detect silent data corruptions caused by transient hardware issues, and provide early alerts of impending disk failures. By default, TrueNAS creates a scrub task when new pool is created. The default …

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You can encrypt the root dataset of a new storage pool to further increase data security. Please note that you will be responsible to remember or otherwise back up passphrases or other access methods to your encrypted data. Data-at-rest encryption is available with: Self Encrypting Drives (SEDs) using OPAL or FIPS …

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Fusion Pools are also known as ZFS Allocation Classes and ZFS Special vdevs. Special Allocation Class The allocations in the special class are dedicated to specific block types. By default, this includes all metadata, the indirect blocks of user data, and any deduplication tables. The class can also be provisioned to …

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Adding Spare Devices ZFS provides the ability to have “hot” spares. These are drives that are connected to a pool, but not in use. If the pool experiences the failure of a data drive, the system uses the hot spare as a temporary replacement. If the failed drive is replaced with a new drive, the hot spare drive is no …

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TrueNAS supports a ZFS feature known as boot environments. With multiple boot environments, the process of updating the operating system becomes a low-risk operation. The updater automatically creates a snapshot of the current boot environment and adds it to the boot menu before applying the update. Boot Environments …

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TrueNAS supports mirroring a boot pool by adding a second device to the original pool. This is especially helpful as one device can fail and the system will still boot. If a device were to fail in a mirror, it can be easily detached and replaced with a new device. View the current boot pool status by going to System …

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August 24, 2020 ZFS is the primary file system for FreeNAS and TrueNAS. It manages stored data and provides both disk protection (mirror, RAID-Z) and data protection (snapshots, replication) services. It is used in FreeNAS/TrueNAS because it is the most reliable open source file system available. While ZFS is extremely …

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Hard drives or solid-state drives (SSDs) have a finite lifetime and can fail unexpectedly. When a disk fails in a Stripe (RAID0) pool, the entire pool has to be recreated and all data restored from backups. Creating non-stripe storage pools that have disk redundancy is always recommended. To prevent further loss of …

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Beginning with the release of FreeNAS 11.1, the algorithm used for scrubs and resilvers received many performance improvements, most noticeably on fragmented pools. Issue: Legacy Behavior Some users might wish to revert to the old algorithm for scrub and resilver. Fix: Revert to Old Behavior The legacy scrub algorithm …

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A periodic snapshot task allows scheduling the creation of read-only versions of pools and datasets at a given point in time. Snapshots can be created quickly and, if little data changes, new snapshots take up very little space. For example, a snapshot where no files have changed takes 0 MB of storage, but as changes …

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Pools are upgraded using the TrueNAS web interface. Before upgrading an existing pool, be aware of these caveats: Upgrading a pool is one-way, meaning that if you change your mind you cannot go back to an earlier ZFS version or downgrade to an earlier version of the software that does not support those ZFS features. …

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Storage > VMware-Snapshots is used to coordinate ZFS snapshots when using TrueNAS as a VMware datastore. When a ZFS snapshot is created, TrueNAS automatically snapshots any running VMware virtual machines before taking a scheduled or manual ZFS snapshot of the dataset or zvol backing that VMware datastore. Virtual …

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Some dataset options are only available in ADVANCED MODE. To see these settings, either click the ADVANCED MODE button or configure the system to always display advanced settings by enabling the Show advanced fields by default option in System > Advanced. Dataset Options Setting Value Advanced Mode Description …

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A problem was found in 2018 regarding ACL loss during replication and was filed with Redmine Ticket 57888. This issue was fixed in 11.1-U8/11.2-U2 with this commit: https://github.com/freenas/os/commit/f1e4c4db88dddaa575066e3f3e7efa849df36efe. Early in 2020, Jira ticket NAS-102541 was reported. After numerous efforts …

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Snapshots are one of the most powerful features of ZFS. A snapshot provides a read-only point-in-time copy of a file system or volume that does not consume extra space in the ZFS pool. The snapshot only uses space when the block references are changed. Snapshots save disk space by recording only the differences between …

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