My Cloud EX2 Disk1 Replacement Issue

My Cloud OS 5 Personal & Network Attached Storage My Cloud EX Series
1

Hi, i’ve just replaced a predicted SMART Disk 1 Fault (WD RED 4TB CMR 64MB Cache) with a new WD RED PLUS 4TB CMR 128MB Cache; followed the procedure for RAID1 and after the rebuild was good i tought i was fine.

Now just 2 days after the new Disk1 RED PLUS is labeled BAD while the RAID is still GOOD.

Any clue?

WDREDPLUS4TB_1
WDREDPLUS4TB_11686×918 79.2 KB

WDREDPLUS4TB_2
WDREDPLUS4TB_21668×1055 88.1 KB

2

Enable SSH via the dashoard and connect using Putty or other similar software, then run the following command and post the results.

smartctl -A /dev/sda

3

root@WDMyCloudMirror ~ # smartctl -A /dev/sda
smartctl 6.6 2017-11-05 r4594 [armv7l-linux-4.14.22-armada-18.09.3] (local build)
Copyright (C) 2002-17, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 100 253 021 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 3
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 81
10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 2
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 0
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 2
194 Temperature_Celsius 0x0022 104 099 000 Old_age Always - 46
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 0

root@WDMyCloudMirror ~ #

4

The SMART data says there’s nothing wrong with the drive. Software RAID tends to be unreliable, so it’s hard to say why OS5 thinks it’s bad. Have you tried rebooting?

5

Not yet; going to run a Full Test to see results, then if everything shows fine i’ll try reboot to see if error disappears.

6

Rebooting should be the FIRST thing you try.

7

Greetings,

We have reached out to you via direct message, so we request you kindly check and reply to your DMs so that we can assist you further.

8

OK, did it today and as of now Red light has disappeared and both Disks and Raid shows Healthy.
Anything else that i need to do to make sure my data are safe and disk are confirmed healthy?

9

I would recommend buying a 4TB (or larger) external HDD and backing up all the data on the NAS to that drive. After doing this. . .take the HDD to another location (preferably not in the same postal code)

There are many common mode failure modes (i.e. Lightning; ransomware) that can wipe out both drives in a Raid 1 array simultaneously.