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The dependable beginner setup for a compact NAS is two equal-capacity, NAS-rated SATA drives in a mirror (RAID 1 or the platform’s equivalent), followed by a volume or dataset and then shared folders. A mirror keeps the NAS online when one drive fails, but it is not a backup: maintain a separate, tested copy elsewhere.
Pool creation can erase every selected drive. Before opening the wizard, copy off anything you need, verify the drives and bays, and decide how you will back up the files after the NAS is usable.
What you need before creating a pool
A storage pool is built from the physical drives installed in the NAS. The pool supplies the underlying capacity and redundancy; it is not the file share that computers browse. Prepare the hardware and network first so you do not have to rebuild a pool later.
Choose the enclosure and drives
- Confirm the number of drive bays and the interfaces they accept. A typical compact two-bay NAS uses two 3.5-inch SATA hard drives, but some systems also support 2.5-inch drives or SSD pools.
- Use NAS-rated drives and check the enclosure manufacturer’s current compatibility list. Synology states that drives in a storage pool must be the same type and warns that incompatible models can affect stability or cause data loss.
- For a two-drive mirror, buy two drives of the same usable capacity. TrueNAS documentation requires at least two identically sized devices for a single mirrored storage pool.
- Check recording technology as well as capacity. TrueNAS discusses conventional magnetic recording (CMR) and shingled magnetic recording (SMR); sustained NAS workloads can behave differently, so follow the platform’s drive guidance instead of assuming any desktop disk is suitable.
- If the system offers M.2 slots or a dedicated boot device, read its hardware rules. An M.2 slot is not automatically hot-pluggable or suitable for a data pool.
Protect data on the drives
Pool creation is destructive. QNAP warns that selecting disks for a new pool can delete existing data, and Synology’s DSM guidance says, “All existing data will be deleted during the creation process.” Move files to another disk or service, verify the copy, and only then select the drives in the wizard.
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Connect the NAS and record its address
- Install the drives with the NAS powered off, using the caddies or screws supplied with the enclosure.
- Connect the NAS to your router or network switch with Ethernet and connect power.
- Allow the device to obtain an address from DHCP. Record the address shown by the device console or discovered by the vendor’s initialization utility.
- Reserve that address in the router, or configure an equivalent stable local address after initial sign-in. A changing address makes mapped shares, backup jobs, and administration harder to maintain.
First boot and basic hardening
Install the operating system supplied with the enclosure, or follow the host’s installation procedure. TrueNAS displays the DHCP-assigned IP address on its console; enter that address in a browser to reach the sign-in page. Synology and QNAP provide their own discovery and initialization flows.
- Open the vendor setup page or the IP address shown on the console.
- Create a strong administrator password. Do not reuse a password from another service.
- Apply current system updates before creating shares or exposing the NAS to clients.
- Set the time zone and enable automatic time synchronization. Correct time is important for logs, certificates, snapshots, and scheduled backups.
- Configure the DHCP reservation or other stable address you chose, then reconnect using that address.
Do not publish the management interface directly to the internet. If remote access is required, use the vendor’s documented secure method or a properly configured VPN, and keep the operating system patched.
Choose a layout that matches your bays and risk
RAID determines the minimum number of drives, how many drive failures the pool can tolerate, and how much raw capacity becomes usable. There is no universally best layout. Use the layout fields in your platform’s wizard because exact support and expansion behavior differ.
| Layout | Minimum drives | Drive-failure tolerance | Usable-capacity idea | Best fit |
|---|---|---|---|---|
| Mirror / RAID 1 | 2 | One drive in a two-drive mirror | Approximately one drive’s capacity, before filesystem overhead, reserved space, and snapshots | Two-bay beginners who want simple protection |
| RAID 5 / RAIDZ1 | Three or more, subject to platform rules | One drive | Roughly the capacity of all but one drive, with implementation overhead | Three-or-more-bay systems seeking more capacity with one-drive protection |
| RAID 6 / RAIDZ2 | More drives than RAID 5/RAIDZ1, subject to platform rules | Two drives | Roughly the capacity of all but two drives, with implementation overhead | Larger pools where an additional failure during replacement is a concern |
For two equal drives, a mirror is the clear baseline. It continues operating after either one drive fails, while its trade-off is that two 8 TB drives provide about 8 TB of raw mirrored capacity, not 16 TB. The exact figure shown by the NAS will be lower after filesystem metadata, reserved space, and any snapshot reservation.
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With three or more bays, parity layouts can provide more usable space than a mirror, but rebuild time, expansion rules, and performance depend on the platform and drive sizes. A RAID level that appears efficient on paper may be a poor choice if the enclosure cannot expand it in the way you expect.
Create the first pool
Keep the destructive confirmation visible while working. Select only the drives you intend to erase, verify their model and serial information, and read the wizard’s minimum-drive and fault-tolerance summary before accepting.
TrueNAS: create a mirrored storage pool
- Sign in to the TrueNAS web interface at the address shown on the console.
- Open the pool-creation workflow from the storage section.
- Enter a pool name that identifies its purpose, such as
mainpool. - Select the two identically sized disks. TrueNAS documentation states: “At minimum, the system needs at least two disks of identical size to create a mirrored storage pool.”
- Choose the mirror layout, or another supported layout if you deliberately selected a different design.
- Review the disk list, redundancy summary, and warning that the operation is destructive.
- Confirm creation and wait for the pool to report a healthy or online state.
- Create datasets for the categories of data you will store, or create a zvol when a block device is specifically required. Configure shares only after the dataset or zvol exists.
Do not put every kind of data in one dataset merely because it is convenient. Separate datasets make permissions, snapshots, quotas, and backup schedules easier to manage.
Synology DSM: create a storage pool and volume
- Sign in to DSM and open Storage Manager > Storage.
- Choose Create > Create Storage Pool.
- Select the RAID type. DSM displays the minimum drive count and the maximum number of drive failures the selected type can tolerate.
- Select only compatible drives that you have already emptied or backed up.
- Review the capacity and destructive-operation warning, then finish the wizard.
- After the pool completes, create at least one volume. DSM’s pool is the foundation; files are stored in shared folders on the volume.
- Wait for any initialization or parity check to complete before treating the pool as fully ready for a large data migration.
QNAP QTS or QuTS hero: create a pool and the next storage layer
- Open Storage & Snapshots, then go to Storage/Snapshots.
- 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, so that RAID 1 or above is available.
- Read the disk-erasure warning, confirm the selected models, and create the pool.
- In QTS, create a volume after the pool. QNAP recommends leaving room in the parent pool for snapshots when configuring a QTS volume.
- In QuTS hero, create a shared folder after the pool and configure its dataset-related settings as offered by the system.
Turn the pool into usable file space
A pool by itself is not a share. The next layer depends on the operating system:
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- DSM: create a volume, then create shared folders on that volume.
- QTS: create a volume in the pool, then create shared folders.
- QuTS hero: create a shared folder after the pool, using the platform’s storage and dataset settings.
- TrueNAS: create datasets for ordinary file storage or zvols for block-storage use, then configure shares that point to them.
Organize by purpose
Create separate datasets or shared folders for documents, photos, backups, and media instead of one undifferentiated directory. This lets you apply different permissions, snapshots, quotas, and backup schedules without moving files later.
Create accounts and permissions
- Create named user accounts rather than sharing the administrator login.
- Group users by role where the platform supports groups.
- Grant each account only the folders it needs. Keep administrative rights separate from ordinary file access.
- Enable SMB for typical Windows and macOS clients unless you have a specific reason to use another protocol.
- From a client computer, connect to the NAS by its stable local address, create a test file, edit it, and delete it. Confirm that each user sees only the intended shares.
Capacity, expansion, and drive replacement decisions
Advertised drive capacity is not the same as free space shown by the NAS. Filesystem metadata, reserved pool space, snapshots, and formatting reduce the number. No single percentage applies to every compact NAS.
Use equal-size drives when building a new mirror or parity group. If one member is larger, many platforms limit the group to the smaller drive’s usable size. Before buying a replacement, check the compatibility list, interface, recording technology, and minimum capacity required by the existing group.
Expansion is platform-specific. Some systems can add drives or replace members with larger drives; others require a new pool or have restrictions on changing RAID levels. Read the wizard’s expansion and migration information before assuming that an empty bay automatically increases capacity.
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Backups: redundancy is not a backup
A mirror or parity pool helps the NAS keep running after a drive failure. It does not protect against accidental deletion, ransomware, theft, fire, corruption, or a failed rebuild. TrueNAS identifies cloud storage and replication to another TrueNAS system as backup approaches, and the same principle applies to other platforms.
- Keep at least one independent copy on another NAS, an external device, or a cloud service.
- Schedule backups rather than relying on a manual copy that will eventually be forgotten.
- Keep the backup destination inaccessible to ordinary NAS users when practical, reducing ransomware exposure.
- Use versioned backups or snapshots for files that change frequently, but do not treat snapshots on the same pool as the only copy.
- Perform a test restore. A backup is not verified until you can recover representative files and open them.
Maintenance after the pool goes online
Monitor drive and pool health
- Enable email, push, or other health alerts in the NAS operating system.
- Review SMART or equivalent drive warnings, temperature readings, and pool status regularly.
- Investigate degraded, faulted, or checksum-error states immediately; do not wait for a second warning.
- Keep firmware and the NAS operating system current, using the vendor’s release notes to plan reboots.
Replace a failed drive carefully
- Confirm which physical disk is failed by matching the bay number, model, and serial number shown in the interface.
- Obtain a compatible replacement that meets or exceeds the failed disk’s required capacity.
- Follow the platform’s documented replace or resilver procedure. Do not remove a healthy disk merely because its indicator is ambiguous.
- Allow the rebuild or resilver to finish and verify that the pool returns to a healthy state.
- Check backup jobs and recent alerts after recovery. A rebuilt mirror restores redundancy, not historical files that were deleted before the failure.
During a rebuild, the remaining drives are under sustained load and the pool has less protection. Keep nonessential workloads light and make sure the independent backup is current.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common setup problems
The NAS does not appear on the network
- Check link lights and replace the Ethernet cable or switch port.
- Look at the router’s DHCP client list or the NAS console for the assigned address.
- Ensure the computer used for setup is on the same local network and not an isolated guest Wi-Fi network.
- Once you regain access, create the DHCP reservation so the address does not change.
The wizard will not offer the desired RAID level
Check the number of selected drives and their sizes. RAID 1 needs at least two drives; RAID 5/RAIDZ1 needs three or more; RAID 6/RAIDZ2 needs more still, with exact requirements determined by the platform. Remove incompatible or mismatched drives and consult the wizard’s fault-tolerance field.
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Compare its exact model with the vendor compatibility list and verify interface, capacity, and recording technology. Do not bypass a compatibility warning simply to complete the pool; the documented warning includes possible stability and data-loss consequences.
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The pool exists but clients cannot save files
Confirm that you created the required volume, dataset, or shared folder after the pool. Then check that the share service is enabled, the client is using the correct address, and the user has write permission. A pool with no volume or dataset has nowhere for a file share to store data.
Free space is lower than the drive labels suggest
Account for the mirror or parity layout first, then filesystem overhead, reserved pool space, and snapshots. In QTS, review the space reserved for snapshots in the volume configuration. Delete or relocate data only after checking which snapshots and backup versions depend on it.
How to compare compact NAS options before buying
Price alone does not describe a useful NAS. Compare these characteristics for the exact model and software version you intend to run:
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Quick Recap
| Comparison axis | Questions to answer |
|---|---|
| Bays and drive types | How many disks fit, which interfaces are supported, and can SSDs or an approved boot device be used? |
| RAID or RAIDZ layouts | Which levels are available, what are the minimum drives, and how is fault tolerance displayed? |
| Compatibility policy | Does the manufacturer publish a current drive list, and what happens when a model is unsupported? |
| Expansion and replacement | Can drives be replaced with larger models, added to a pool, or migrated to another layout? |
| Network speed | Is the interface adequate for the clients and workload, and will the switch support it? |
| Memory and applications | Is the installed memory sufficient for file sharing, snapshots, containers, or other planned services? |
| Snapshots and backup | Are snapshots, replication, cloud targets, scheduling, and restore verification supported? |
| Noise and power | Will the fan and drive noise suit the room, and is power draw acceptable for continuous operation? |
| Alerts and recovery tools | Does the interface identify a failed disk clearly and provide actionable health notifications? |
A practical first-day checklist
- Back up or empty every drive selected for the pool.
- Confirm bay count, drive type, compatibility, and CMR/SMR guidance.
- Install equal-capacity drives and connect the NAS by Ethernet.
- Record the DHCP address, set the administrator password, and apply updates.
- Create a DHCP reservation or equivalent stable address.
- Select a RAID layout based on required capacity and failure tolerance, not habit.
- Read the destructive warning and verify the disk list before confirming.
- Create the required volume, dataset or zvol, and shared folders.
- Create named users, least-privilege permissions, and SMB shares where appropriate.
- Configure an independent backup and complete a test restore.
- Enable health alerts and schedule routine checks.
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