Resolve Synology NAS RAID 1 degraded state with crashed drive

draft · equipment serverhard-driveraidsynologynas

Generated by docuprocessor (prompt article/v3) · 2026-04-22 12:08

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thread_id: spaces/AAAA05BdS6s/threads/g4lzuLecLpg · 21 msgs · first 2024-11-01 · participants: Tech ATech BTech C

Tech A 2024-11-01 17:46

Hi team, for Smile lab - a drive on the NAS has been degraded, but I can't repair it without inserting another drive. Is there any other option?

image/png image.png

**Synology DSM – Storage Manager: Degraded Storage Pool Alert** Storage Pool 1 (3.6 TB, RAID 1) is in a **Degraded** state, with "Insufficient number of drives: 1" displayed. A modal dialog titled **"Install more drives"** states at least **1 additional drive** is required meeting the following criteria: **Drive type: SATA HDD not 4K native**, **Drive capacity: ≥ 3.6 TB**. Both listed drives under device name **SmileLabNAS** show **Health Status: Healthy**; Volume 1 is also flagged as **Degraded** with file system **ext4**.

Tech B 2024-11-01 17:47

is it a dual drive setup?

Tech A 2024-11-01 17:48

how can I check that?

Tech B 2024-11-01 17:50

in the hardware manager there should be a list of drives

Tech B 2024-11-01 17:50

Go to Storage Manager > HDD/SSD

Tech A 2024-11-01 17:52

I guess this is a dual setup

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**Synology Storage Manager – HDD/SSD Panel** Drive 1 (WDC WD40EFPX-68C6CN0, Serial: WD-WX72D243H5YL, Firmware: 81.00A81) shows an **Allocation Status of "Crashed"** with a red error indicator, despite Health Status reading **"Healthy"**; temperature is 26°C / 79°F, capacity 3.6 TB, located in Storage Pool 1 on host "SmileLabNAS." Drive 2 (WDC WD40EFRX-68N32N0, 3.6 TB) displays a green indicator with **"Normal"** status and no errors.

Tech B 2024-11-01 17:52

but rerargless, the whole idea of NAS is to use raid or similar technologies for redundancy. And it requires several drives

Tech B 2024-11-01 17:52

ok, so this is a dual HDD setup, mirroriing

Tech B 2024-11-01 17:53

you cannot rebuild the array because one of the drives is dead

Tech B 2024-11-01 17:53

the only option is to get a replacement drive (can be same or larger in space but can not be smaller than existing)

Tech B 2024-11-01 17:54

what u can do now is to disable the beeping that indicates the HDD failure

Tech A 2024-11-01 17:55

Will do Sergey, thank you

Tech B 2024-11-01 17:55

but the question is - do we really want to disable it? The more annoying it beeps for the office, the faster they get a replacement one 🙂

Tech A 2024-11-01 17:56

So, should I disable it? Haha

Tech B 2024-11-01 17:57

(no text)

Tech B 2024-11-01 17:57

i would first explain the doc that its an emergency and only if he starts complaining about the beep, I would disable it

Tech C 2024-11-01 18:00

They Need to replace the dead disk

Tech A 2024-11-01 18:10

is this a good option? https://a.co/d/4LX4yDi

Tech C 2024-11-01 18:13

https://a.co/d/9cDXhvk

Tech A 2024-11-01 18:14

thanks

Tech C 2024-11-01 18:15

this one has smaller bandwidth SATA 1.5 Gb/s

---
title: "Resolve Synology NAS RAID 1 degraded state with crashed drive"
category: equipment
tags: ["server", "hard-drive", "raid", "synology", "nas"]
source_thread_id: "spaces/AAAA05BdS6s/threads/g4lzuLecLpg"
source_space: "spaces/AAAA05BdS6s"
generated_at: "2026-04-22T12:08:26"
participants: ["Tech A", "Tech B", "Tech C"]
---

# Resolve Synology NAS RAID 1 degraded state with crashed drive

## Problem

A Synology NAS (SmileLabNAS) with a dual-drive RAID 1 configuration entered a degraded state due to one failed drive. Storage Pool 1 (3.6 TB, RAID 1) shows "Insufficient number of drives: 1" and requires at least 1 additional drive meeting specific criteria: SATA HDD not 4K native with capacity ≥ 3.6 TB.

Drive 1 (WDC WD40EFPX-68C6CN0) displays allocation status "Crashed" with a red error indicator, while Drive 2 (WDC WD40EFRX-68N32N0) shows normal status. Both drives report healthy status, but the crashed drive cannot participate in the RAID array, leaving the system running on a single drive without redundancy.

## Resolution

1. **Verify drive status**: Navigate to Storage Manager > HDD/SSD to confirm which drive has failed and review the RAID configuration
2. **Obtain replacement drive**: Purchase a replacement drive that meets the system requirements:
   - Drive type: SATA HDD (not 4K native)
   - Capacity: Equal to or larger than existing drives (≥ 3.6 TB in this case)
   - Cannot be smaller than the existing functional drive
3. **Install replacement drive**: Physically install the new drive in the NAS enclosure
4. **Rebuild RAID array**: Use the Synology DSM interface to rebuild the degraded RAID 1 array with the new drive
5. **Optional - Disable beeping**: If the failure beeping becomes disruptive, it can be disabled through the DSM interface, though leaving it enabled may encourage faster replacement

The RAID array cannot be rebuilt without a physical replacement drive, as RAID 1 requires two functional drives for mirroring.

## References

- Source discussion: `spaces/AAAA05BdS6s/threads/g4lzuLecLpg`
- Attachments:
  - ![image.png](../attachments/g4lzuLecLpg.beWTVcM6XWU/image.png) — **Synology Storage Manager – HDD/SSD Panel**
  - ![image.png](../attachments/g4lzuLecLpg.g4lzuLecLpg/image.png) — **Synology DSM – Storage Manager: Degraded Storage Pool Alert**

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