Xpenology DSM 7.4: Loader, Drive & Stability Guide

Synology

DSM 7.4 has been available since June 2026, followed by DSM 7.4.1-90080 in July. For genuine Synology hardware, moving between these releases is largely a normal supported update process. Xpenology is different.

The question is no longer simply whether DSM 7.4 can boot on custom hardware. Current loaders make that possible on many configurations. The bigger issue is whether your particular combination of CPU, network controller, SATA or HBA hardware, loader configuration, emulated Synology model, SSDs, and DSM modifications will continue behaving correctly after the update.

That makes DSM 7.4 maintenance more important than simply achieving a successful first boot. If your Xpenology system is already stable, take the time to document it before changing anything.

DSM 7.4 and 7.4.1 Are Running on Xpenology

The short answer is yes: DSM 7.4 can run successfully on compatible Xpenology systems using current DSM 7.x loaders. Arc remains one of the most prominent current choices. It is a customized Redpill-based loader providing hardware support, addons, extensions, and a guided installation process for DSM 7.x.

Arc also makes an important architectural distinction:

Arc and DSM are separate components.

Arc is the boot helper that enables DSM to operate on the custom hardware. That distinction matters during updates because upgrading DSM does not necessarily mean you need to completely reinstall or rebuild the loader. But it also does not mean every new DSM build is automatically safe with an old loader configuration.

Don’t Update DSM and the Loader at the Same Time

One of the best maintenance habits for Xpenology is changing one major variable at a time.

If you simultaneously:

Update Arc
Change the emulated Synology model
Upgrade DSM
Update drive-database scripts
Change SATA mappings
Add an HBA

and the NAS stops booting, troubleshooting becomes unnecessarily difficult. A better strategy is to get the loader environment current and stable first. Confirm the existing DSM installation still boots.

Then back up important information. Only after that should you consider the DSM 7.4 upgrade. The objective is to maintain a known-good baseline throughout the process.

CPU Compatibility Matters More With DSM 7.4

DSM releases increasingly depend on CPU capabilities associated with the Synology platform being emulated. That makes old Xpenology hardware particularly important to review before moving to 7.4. A processor that successfully ran an older DSM release does not automatically guarantee compatibility with every newer build or platform profile. Current Arc guidance for newer DSM branches includes CPU instruction requirements that can exclude some older processors.

Before updating, verify:

CPU generation

Required instruction support

Arc platform/model selection

Kernel generation

Boot mode

This is especially important when trying to extend the life of old Intel systems that have already survived several DSM generations.

If the CPU does not support what the selected DSM platform expects, no amount of drive-database editing will solve the underlying problem.

Choose the Loader Branch for Stability, Not Novelty

Arc currently provides several options, including the standard Arc Loader, Arc Loader Essential for reduced Linux 5.x deployments, Beta releases, and other specialized variants.

For a NAS containing important data, the newest experimental loader is not automatically the best loader.

Prefer the stable build that explicitly supports:

your DSM version

your selected Synology model

your CPU

your network interface

your SATA/HBA controller

Beta builds can be useful when you specifically need a new driver or DSM compatibility fix.

They are less attractive when your existing stable configuration already supports everything you need.

DSM 7.4.1 Is Not Just Another Tiny Xpenology Update

Synology released DSM 7.4-90075 on June 16, 2026 and DSM 7.4.1-90080 on July 23. Both releases restart the NAS. More importantly, Synology states that after installing these versions, you cannot perform a normal downgrade to an earlier DSM version. For Xpenology users, that warning deserves even more attention. An unsupported system cannot rely on Synology support to recover an unusual loader or hardware combination. Before moving from 7.3 to 7.4, assume the change needs to work rather than relying on an easy rollback.

Back Up More Than Your Files

Your data is obviously the first priority.

But an Xpenology upgrade also benefits from documenting the configuration that made the system work.

Before updating, record:

Arc version
DSM version and build
Emulated Synology model
CPU
NIC chipset
SATA controller
HBA model and mode
Drive order
SATA mappings
Installed addons
Custom modules
NVMe configuration
Drive-database modifications
Scheduled scripts
Package list

Take screenshots of Arc’s system information where useful.

If something changes after the upgrade, this becomes your troubleshooting baseline.

The Drive Database Is a Major DSM 7.4 Maintenance Issue

A successful DSM boot does not mean Storage Manager will treat every installed drive the way it did before the upgrade. DSM uses compatibility databases to determine whether HDDs, SATA SSDs, SAS drives, and NVMe devices are recognized as supported configurations.

This can produce warnings such as:

Unverified

Unsupported firmware

or other compatibility-related messages. On Xpenology, those warnings can be especially common because the hardware configuration does not correspond to the genuine Synology model DSM believes it is running on.

Synology_HDD_db Remains Relevant on DSM 7.4

One widely used community solution is the Synology_HDD_db project.

Its current documentation explicitly lists compatibility with:

DSM 6

DSM 7.1

DSM 7.2

DSM 7.3

DSM 7.4

The script detects installed HDDs, SSDs, SAS drives, and NVMe devices and adds missing hardware to DSM’s compatible-drive databases. It can also handle several related compatibility settings. But DSM 7.4 changed the structure of some of those database files, which is exactly why using an old script release is a bad idea.

DSM 7.4 Required a Specific HDD Database Script Fix

When DSM 7.4 arrived, Synology_HDD_db required an update because DSM now included additional rules database files in the drive-database directory. Version 3.6.131, released alongside DSM 7.4 in June, specifically added a fix for this change.

That illustrates a broader Xpenology rule:

Don’t assume a modification that worked on DSM 7.3 will behave identically on DSM 7.4.

Check the modification’s current release information first.

Later script releases have continued to address DSM 7.4-series behavior, so use a currently maintained release rather than an old copy stored on your NAS for years.

Drive Database Fixes May Need to Be Reapplied After DSM Updates

The Synology_HDD_db documentation states that the script needs to be rerun following DSM updates. For systems that update automatically, its developer recommends using DSM Task Scheduler to run the script at boot.That can make ongoing maintenance much easier.

But automation creates its own responsibility. If DSM changes something important and an old script automatically modifies system files during the first boot, you may introduce another troubleshooting variable before you have even inspected the updated NAS.

For Xpenology systems containing important data, consider validating script compatibility with the new DSM build before allowing automatic modifications.

SSD and NVMe Verification Can Be a Separate Problem

M.2 storage deserves additional attention. DSM does not treat every NVMe configuration the same way it treats ordinary SATA storage.

Community tools exist to:

Add NVMe devices to compatibility databases
Enable non-Synology M.2 storage pools
Address unsupported firmware warnings
Enable M.2 functionality on otherwise unsupported configurations

But these are separate modifications with separate maintenance requirements.

Do not assume that fixing an “Unverified” SATA HDD automatically fixes an NVMe storage pool.

Likewise, a DSM upgrade can affect an M.2 volume differently from the main HDD volume.

Never Store Your Recovery Script Only on the M.2 Volume It Fixes

This is an easy but important mistake.

The Synology_HDD_db developer specifically warns against storing the script solely on an M.2 volume.

Why?

After a DSM or Storage Manager update, the M.2 volume may not become available until the compatibility modification has been applied again.

If the script required to restore access is stored on that unavailable volume, you have created a circular recovery problem.

Store maintenance scripts somewhere that remains accessible independently of the modified NVMe storage.

Don’t Confuse Compatibility Status With Drive Health

If DSM 7.4 suddenly marks a drive as unverified, that does not automatically mean the disk is failing.

Check actual health information separately.

Look at:

S.M.A.R.T. information where available
Bad sectors
Reconnection events
I/O errors
Storage pool status
Volume status
Drive temperatures

A compatibility warning tells you DSM does not consider the hardware validated for the emulated Synology model.

A failing-drive warning tells you the storage device may actually be unhealthy.

Those require very different responses.

SATA and HBA Behavior Should Be Checked After Every Major Update

Custom Xpenology systems frequently rely on storage controllers that never existed in the Synology model being emulated.

Arc provides extensive hardware support, but the exact result still depends on drivers, controller mode, kernel support, and platform configuration.

After upgrading to DSM 7.4 or 7.4.1, verify:

Every disk appears

Drive order is correct

No disk unexpectedly changed slot

Storage pools are healthy

S.M.A.R.T. information behaves as expected

Hot-plug behavior is correct if required

No controller-related errors appear

Be especially cautious with HBAs and hardware RAID controllers.

Xpenology generally behaves most predictably when DSM can see disks individually rather than through a hardware RAID abstraction.

Virtualized Xpenology Needs Another Layer of Testing

If DSM is running as a VM under Proxmox, ESXi, or another hypervisor, you are maintaining several layers:

Physical hardware

↓

Hypervisor

↓

Virtual hardware / passthrough

↓

Arc

↓

DSM

↓

Storage and packages

A DSM update can expose a problem that actually originates from virtual disk configuration, passthrough, NIC emulation, or loader disk ordering.

Do not immediately assume DSM itself is responsible.

For virtual deployments, document which virtual disk contains Arc and which devices contain DSM data.

Keep the loader disk separate and predictable.

Package Compatibility Still Matters

Even when DSM itself boots perfectly, packages can create trouble after a major upgrade.

Check applications such as:

Hyper Backup
Synology Drive Server
Snapshot Replication
Container Manager
Virtual Machine Manager
Surveillance Station
Community packages

Third-party packages deserve particular scrutiny.

A package developed against older DSM libraries may fail even though Arc and DSM are functioning normally.

After updating, test the service rather than simply confirming that Package Center shows it as installed.

Don’t Apply Every Xpenology Fix You Find

The Xpenology community contains scripts for almost everything:

drive databases, M.2 storage, unsupported network adapters, deduplication, expansion units, SHR, memory warnings, and more.

That does not mean every system needs all of them.

Each modification increases the number of things that may need to be checked after the next DSM update.

If your system does not have a problem, don’t apply a fix simply because another Xpenology user did.

The most maintainable Xpenology configuration is usually the one with the fewest modifications required to achieve the desired functionality.

DSM 7.4.1 Stability Depends on the Whole Stack

For compatible hardware using a current loader, DSM 7.4/7.4.1 can be a practical Xpenology environment.

But “DSM 7.4.1 is stable on Xpenology” is too broad a statement.

One user’s stable system might use:

Intel CPU + onboard SATA + Intel NIC + standard HDDs

Another might use:

AMD CPU + LSI HBA + multiple NVMe drives + 10GbE + custom modules + Proxmox passthrough

Those are fundamentally different environments.

Stability needs to be evaluated per configuration.

Use a Controlled Upgrade Routine

For an existing stable Xpenology system, a safer maintenance sequence is:

1. Verify hardware and CPU compatibility.

2. Confirm the current Arc release supports the target DSM build.

3. Record loader, model, controller, NIC, drive and addon configuration.

4. Make an independent backup of important data.

5. Update or validate the loader without unnecessarily changing the platform configuration.

6. Confirm the old DSM installation still boots correctly.

7. Verify current versions of any drive or M.2 compatibility scripts.

8. Upgrade DSM.

9. Verify every HDD, SSD and NVMe device before doing anything else.

10. Reapply only the compatibility modifications actually required.

11. Reboot if required and recheck Storage Manager.

12. Test packages, shares, backups, network services and scheduled tasks.

Then leave the system running long enough to reveal errors before making additional changes.

When Staying on DSM 7.3 Is the Better Choice

There is no requirement that every working Xpenology installation move to DSM 7.4 immediately.

If your CPU is marginal for newer requirements, your loader configuration is old, an essential package has not been validated, or the NAS contains irreplaceable data with no tested recovery plan, waiting may be the better decision.

New DSM features are useful.

Stable storage is more useful.

A NAS that has run reliably for years should not become an experiment simply because Control Panel shows a newer release.

About Epis Technology

Epis Technology helps organizations evaluate Synology storage, DSM upgrades, virtualization, and migration strategies with long-term reliability in mind. While Xpenology and community loaders can be useful for labs, testing, and experienced home users, Epis Technology helps businesses move critical workloads toward supported Synology infrastructure when uptime and vendor support matter. Services include Synology NAS selection, DSM migration, HDD and SSD planning, Btrfs storage design, 10GbE networking, Hyper Backup, Active Backup for Business, ActiveProtect, Proxmox and VMware migration, Microsoft 365 and Google Workspace protection, ransomware resilience, and disaster recovery.