A compact NAS becomes useful in three stages: install compatible drives and initialize the system, create a storage pool with a layout that matches your drive count and failure tolerance, then build usable file space with a volume or dataset and a shared folder. For a typical two-bay NAS, two equal-capacity NAS-rated SATA drives in a mirror (RAID 1) are the simplest starting point: the array continues operating if one drive fails, while usable capacity is approximately the size of one drive before filesystem, snapshot and reserved-space overhead.
This guide covers preparation, first boot, pool creation in TrueNAS, Synology DSM and QNAP QTS or QuTS hero, share permissions, capacity planning, drive replacement and backup practices.
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What you need before opening the setup wizard
Pool creation is a destructive operation. Selecting a disk can erase every existing partition and file on it, so copy anything important elsewhere and verify that the drives are empty before you confirm the wizard.
Hardware and network checklist
- NAS enclosure or host: Confirm the number of bays, supported drive interfaces and whether the system requires a dedicated boot device.
- Compatible drives: For a two-bay system, start with two equal-capacity NAS-rated SATA hard drives. Check the enclosure’s current compatibility list; Synology, for example, recommends using drives on its list, and its guidance says a pool should use drives of the same type.
- Network connection: Connect the NAS to your router or switch with Ethernet. Record the DHCP-assigned management address from the router’s client list or the NAS console.
- Administrator credentials: Have a unique administrator password ready. Do not reuse your email or router password.
- Client requirements: Decide which computers, phones, media players or backup jobs will connect, and whether they need SMB, NFS, iSCSI or another protocol.
TrueNAS’s hardware guidance expects two identically sized devices for a single mirrored pool. If your platform supports SSD pools or an M.2 slot, read its hardware rules first: an M.2 connector may be intended for caching or boot storage rather than a data pool, and it may not be hot-pluggable.
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Prepare the drives
- Power off the enclosure and install each drive in a numbered bay, following the manufacturer’s orientation and screw or tray instructions.
- Label the drive serial numbers or bay positions. This makes a later replacement less error-prone.
- If a drive contains old data, securely copy that data elsewhere and remove it before pool creation. Do not rely on a format performed by another computer as proof that the contents are backed up.
- Keep the NAS connected to a reliable power source. A UPS is useful during initialization and rebuilds because an outage can interrupt writes.
Choose a pool layout before you create it
RAID or RAIDZ determines the minimum number of drives, how many drive failures the pool can tolerate and how much raw capacity is available for files. There is no universally best layout; the right choice depends on bays, drive sizes, workload and the value of continued service during a failure.
| Layout | Minimum drives | Drive-failure tolerance | Usable-capacity rule of thumb | Typical compact-NAS use |
|---|---|---|---|---|
| Single disk | 1 | None | Approximately one drive, less filesystem overhead | Testing or non-critical data only |
| Mirror / RAID 1 | 2 | One drive | Approximately one drive’s capacity | Default for a two-bay NAS when redundancy matters |
| RAID 5 / RAIDZ1 | 3 | One drive | Approximately the sum of all but one drive | Three- or four-bay systems seeking more capacity |
| RAID 6 / RAIDZ2 | 4 | Two drives | Approximately the sum of all but two drives | Larger pools where extra fault tolerance justifies lost capacity |
| JBOD or a span | Usually 1 or more | None as a set | Varies by implementation | Capacity aggregation when availability is not required |
These are planning rules, not guaranteed figures. Filesystem metadata, reserved space, snapshots and platform-specific overhead reduce the space shown to users. The pool wizard is authoritative for the exact minimum-drive count and maximum drive-failure tolerance supported by your version.
Why a two-drive mirror is the beginner baseline
A mirror writes the same data to both drives. If one drive fails, the surviving member still contains the data and the NAS can remain online while you replace and rebuild the failed member. The trade-off is capacity: two 12 TB drives do not provide 24 TB of file space; the pool starts with roughly one drive’s capacity, subject to overhead.
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With three or more bays, RAID 5 or RAIDZ1 can provide more capacity while tolerating one failed drive. RAID 6 or RAIDZ2 reserves parity for two failures and therefore gives up more capacity. Exact expansion, replacement and mixed-size behavior differs between platforms, so read the wizard’s warnings before committing.
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Initialize the NAS and secure network access
- Power on the NAS and wait for the vendor’s discovery or initialization screen. If you installed TrueNAS, the local console displays the DHCP-assigned IP address.
- Enter that address in a browser on the same local network to open the management interface. Synology and QNAP provide their own discovery and initialization flows if the address is not obvious.
- Set a strong administrator password and save it in a password manager. Disable or rename any default administrator account if the platform permits.
- Apply current operating-system and firmware updates before creating shares. Reboot when the system requests it.
- Create a DHCP reservation in the router, or configure an equivalent stable local address. A stable address prevents mapped drives, backup jobs and monitoring tools from breaking after a lease change.
- Set the correct time zone and enable automatic time synchronization. Accurate timestamps matter for snapshots, logs and backup verification.
Create the first storage pool
TrueNAS
- Sign in to the TrueNAS web interface and open the pool-creation workflow in the storage section.
- Enter a pool name that identifies its purpose, such as
main-pool. Avoid spaces if you expect to use command-line tools or scripts. - Select the intended disks by their serial numbers or bay positions. Confirm that no selected disk contains data you still need.
- Choose Mirror for two equal-sized drives. TrueNAS documentation states that a mirrored pool needs at least two identically sized disks; half of the selected disk capacity provides storage and the other half provides protection.
- Review the layout, estimated capacity and warning that the operation is destructive. Confirm only after checking the disk list.
- After the pool is online, create datasets for ordinary files or a zvol for block storage such as iSCSI. Then create and enable the required shares.
A dataset is normally the right choice for documents, photos, media and backups because you can assign permissions, quotas, snapshots and replication policies independently. A zvol is a virtual block device and should be created only when an application specifically requires block storage.
Synology DSM
- Open Storage Manager > Storage.
- Choose Create > Create Storage Pool.
- Select the RAID type. DSM displays the minimum number of drives and the maximum number of drive failures that the selected type can tolerate.
- Select compatible drives and check their bay numbers and capacities. DSM’s creation process deletes existing data on selected drives, so stop if any disk is not expendable.
- Complete the wizard and wait for the pool to initialize. A parity check or background consistency task can take many hours.
- Return to Storage Manager and create at least one volume. A pool alone is not a file location; the volume is the space in which shared folders are created.
Use separate shared folders for documents, photos, backups and media when they need different users, quotas, snapshots or retention schedules.
QNAP QTS
- Open Storage & Snapshots, go to Storage/Snapshots and choose New Storage Pool.
- Select the disks and choose the RAID level. QNAP recommends at least two disks when protection against a disk failure is required, allowing a RAID 1 choice on a two-bay system.
- Read the disk-erasure warning, verify the serial numbers and confirm the pool.
- In QTS, create a volume after the pool. When configuring a thick or thin volume, leave room in the parent pool for snapshots if you intend to use them.
- Create shared folders inside the volume and assign users, groups and access permissions.
QNAP QuTS hero
- Use Storage & Snapshots > Storage/Snapshots > New Storage Pool, select the drives and choose a supported RAID level.
- Confirm the destructive operation and wait for pool initialization.
- Create a shared folder in the pool after creation. QuTS hero uses its ZFS-based storage architecture, so follow its prompts for datasets, snapshots and sharing rather than assuming the QTS volume workflow applies.
Turn the pool into usable file space
Pool terminology differs, but the sequence is consistent: pool first, then a logical storage layer, then a share. DSM and QTS normally require a volume; TrueNAS uses datasets or zvols; QuTS hero creates shared folders in its pool structure.
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Organize by purpose
Create separate datasets or shared folders for at least these categories when they need different controls:
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- Documents: Personal or work files with restricted user access.
- Photos and media: Larger files that may be read by several household accounts.
- NAS backups: A destination for computer or phone backup jobs, with a retention policy that prevents the share from filling the pool.
- Applications: Data for containers or packages that should not be mixed with ordinary user files.
Separate storage areas let you apply a different quota, snapshot schedule, replication policy or permission set without restructuring the whole pool later.
Create users, groups and permissions
- Create a named account for each person or service. Avoid using the administrator account for daily file access.
- Create groups such as
family,backupormediawhere several accounts need the same permissions. - Grant the minimum access needed to each dataset or shared folder. Give read-only access to archives and write access only where files must be changed.
- Enable SMB for typical Windows and macOS clients. Enable NFS, FTP or iSCSI only when a specific client or application requires it.
- From a client computer, connect using the NAS hostname or reserved IP address and test both an allowed operation and a denied operation.
Do not expose the management interface or SMB directly to the public internet. Use a properly configured VPN or another controlled remote-access method for off-site access.
Capacity, drive compatibility and expansion decisions
Plan from usable, not advertised, capacity
Drive manufacturers quote decimal terabytes, while operating systems often display a smaller binary value. RAID metadata, filesystem overhead, snapshots and reserved free space reduce the number further. Before buying drives, estimate the working set, growth over several years and the space needed for local backup versions.
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Use compatible, consistent drives
Do not mix drive types casually. Synology warns that incompatible drives can affect stability or cause data loss, and its guidance calls for drives of the same type within a storage pool. Mixing capacities usually wastes the excess on larger drives in a mirror or parity group, while mixing recording technologies can create uneven performance.
TrueNAS documentation discusses conventional magnetic recording (CMR) and shingled magnetic recording (SMR). For sustained NAS workloads and long rebuilds, verify which technology a drive uses and whether your platform recommends it. A label such as “NAS” alone does not establish that a particular model is suitable for your workload.
Understand expansion limits
Adding a drive, replacing a member with a larger drive and changing a RAID level are different operations. Some platforms support online expansion only for particular layouts or require replacing every member before extra capacity appears. Others cannot convert a two-drive mirror into a parity layout without creating a new pool and moving data.
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Backups, snapshots and drive-failure recovery
RAID is not a backup
A mirror or parity layout helps the NAS continue after a drive failure, but it does not restore files deleted by mistake, encrypted by ransomware, damaged by a bad application, stolen with the NAS or lost in a fire. Keep at least one independent copy on another NAS, an external device or a cloud service. TrueNAS identifies cloud storage and replication to another TrueNAS system as backup approaches.
Schedule backups and perform a test restore of representative files. A job that reports “completed” is not proof that the destination can restore a usable file.
Use snapshots as a recovery aid
Snapshots can provide fast recovery from accidental edits or deletion when the filesystem and platform support them. They consume pool space and remain on the same hardware, so set retention limits and include the underlying data in an independent backup.
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- Read the alert and identify the failed bay or serial number. Do not remove a healthy disk based only on its position.
- Confirm that the pool is degraded rather than offline, and make sure a current independent backup exists.
- Install a compatible replacement that is at least as large as the failed member according to the platform’s usable-size calculation.
- Use the storage interface’s Replace, Resilver or Rebuild action. Do not initialize the replacement as a separate pool first if the wizard expects an unassigned disk.
- Monitor health and performance until the rebuild finishes. Avoid unnecessary heavy workloads during this period; another failure can exceed the layout’s tolerance.
- After the pool returns to a healthy state, review alerts, run a filesystem or scrub check if offered, and update the backup copy.
Routine maintenance
- Enable email, push or dashboard alerts for degraded pools, high temperatures, failed SMART tests and low free space.
- Review SMART or equivalent health data on a schedule. A clean SMART report does not replace a backup.
- Install stable operating-system updates and reboot during a planned maintenance window.
- Test a restore at least occasionally, including permissions and application data rather than only a single photo.
- Document the pool layout, drive serial numbers, administrator recovery method and backup destinations.
Troubleshooting common first-setup problems
The NAS does not appear on the network
- Check link lights and try a different Ethernet cable or switch port.
- Look in the router’s DHCP client list and compare the MAC address with the NAS label or console.
- Temporarily connect a computer and NAS to the same switch, then retry the vendor discovery tool.
- If the address changes after a reboot, create the DHCP reservation before mapping shares.
A drive is missing from the pool wizard
- Power down and reseat the tray, then check whether the drive appears in the hardware or disk-information page.
- Verify that the interface and capacity are supported and that the disk is not already assigned to another pool, cache or boot device.
- Check the vendor compatibility list and the drive’s health. Do not force an unknown disk into a production pool.
The wizard warns that data will be deleted
Stop and identify every selected disk. The warning is expected when creating a new pool, not an error to bypass. Copy the data elsewhere, verify the copy, then return to the wizard.
The pool exists but no one can open files
- Confirm that a volume or dataset was created after the pool.
- Confirm that a shared folder exists and is assigned to the intended volume or dataset.
- Check the user’s group membership and share permissions, then test with a non-administrator account.
- Verify that the client is using the correct hostname or reserved IP and that SMB is enabled when required.
A rebuild is taking a long time
Large disks, parity layouts and active workloads can make a rebuild last many hours or longer. Keep the NAS powered, monitor temperatures and alerts, and avoid removing additional disks. If the pool becomes unavailable or reports a second failure, stop experimenting and follow the platform’s recovery procedure using the independent backup.
How to compare compact NAS choices
When selecting an enclosure or host, compare the features that affect the pool and its long-term operation rather than focusing only on bay count.
Quick Recap
| Comparison axis | Why it matters |
|---|---|
| Number of bays | Sets the maximum drive count and which mirror or parity layouts are practical. |
| Supported RAID or RAIDZ layouts | Determines minimum drives, fault tolerance, capacity and whether a future expansion path exists. |
| Drive-compatibility policy | Reveals which models, capacities and recording technologies are supported and how alerts are handled. |
| Replacement and expansion behavior | Shows whether you can add drives, replace members with larger units or migrate layouts without rebuilding from backup. |
| Network speed | Affects large-file transfers and the number of simultaneous clients; the fastest port does not eliminate disk or protocol limits. |
| Memory and application requirements | Containers, indexing, encryption and snapshots may require more memory than simple file sharing. |
| Snapshot and backup features | Determine how easily you can recover deleted files and send copies to another device or cloud destination. |
| Noise and power draw | Important when the NAS will run continuously near living or working spaces. |
| Recovery and alerting tools | Clear health reports, replacement workflows and notifications reduce the chance of an avoidable outage. |
A practical first-day sequence
- Install two compatible, equal-capacity NAS-rated drives in a two-bay enclosure, or install the number required by your chosen parity layout.
- Connect Ethernet, record the DHCP address and complete the vendor’s initialization wizard.
- Set a unique administrator password, update the system and reserve its network address.
- Create a mirror/RAID 1 pool for two-drive redundancy, or select another layout after checking its minimum-drive and fault-tolerance fields.
- Create a volume in DSM or QTS, or datasets/zvols in TrueNAS; create a shared folder for each purpose that needs separate permissions or snapshots.
- Create named users and groups, enable SMB for ordinary desktop clients and test access from each client type.
- Configure an independent backup, enable health alerts and perform a small restore test before treating the NAS as your primary file store.
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