Manual checkup on software raid1

Greetings everyone,

I am planning on upgrading the storage capacity of my omv-server. But before I do that I would like to run a check on my software raid1 mirror (ext4) that contains all my data files. Yes I know that the current setup is generally frowned upon. That’s why my upgrade will be a btrfs raid1 or a snapraid setup. Btw, the mirror hasn’t failed me thus far.

Anyways is it safe to perform a fsck on a active array or perhaps another way? Do I need to specify additional parameters in the command:

sudo fsck /dev/md0

The array is currently clean:

Version : 1.2

Creation Time : Tue Mar 23 21:14:02 2021

Raid Level : raid1

Array Size : 2930134464 (2794.39 GiB 3000.46 GB)

Used Dev Size : 2930134464 (2794.39 GiB 3000.46 GB)

Raid Devices : 2

Total Devices : 2

Persistence : Superblock is persistent

Intent Bitmap : Internal

Update Time : Sun Aug 29 17:33:23 2021

State : clean

Active Devices : 2

Working Devices : 2

Failed Devices : 0

Spare Devices : 0

Consistency Policy : bitmap

Name : openmediavault:DataRaid1 (local to host openmediavault)

UUID : 0fc23ec2:e1cbd729:96af3181:7854fba8

Events : 6695

Number Major Minor RaidDevice State

0 8 0 0 active sync /dev/sda

1 8 16 1 active sync /dev/sdb

Thank you for the help.

I am aware of that option nowadays. To use sync for backing up the main data drive periodically to another drive.

No filesystem problems experienced. I meant it as a precautionary measure before moving the data over the new array. By coincidence one of my wd red 3TB disks start to make clicking an clunking sounds this morning! Kind of freaky that this happened just after I posted something here. I did a comparison of the smart values:

WD-WCC4N1LL838J

SMART Attributes Data Structure revision number: 16

Vendor Specific SMART Attributes with Thresholds:

ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE

1 Raw_Read_Error_Rate POSR-K 200 200 051 - 0

3 Spin_Up_Time POS--K 179 177 021 - 6008

4 Start_Stop_Count -O--CK 100 100 000 - 102

5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0

7 Seek_Error_Rate -OSR-K 200 200 000 - 0

9 Power_On_Hours -O--CK 074 074 000 - 19246

10 Spin_Retry_Count -O--CK 100 100 000 - 0

11 Calibration_Retry_Count -O--CK 100 253 000 - 0

12 Power_Cycle_Count -O--CK 100 100 000 - 87

192 Power-Off_Retract_Count -O--CK 200 200 000 - 56

193 Load_Cycle_Count -O--CK 167 167 000 - 100876

194 Temperature_Celsius -O---K 118 108 000 - 32

196 Reallocated_Event_Count -O--CK 200 200 000 - 0

197 Current_Pending_Sector -O--CK 200 200 000 - 0

198 Offline_Uncorrectable ----CK 200 200 000 - 0

199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 0

200 Multi_Zone_Error_Rate ---R-- 200 200 000 - 0

WD-WCC4N3ANT71D

SMART Attributes Data Structure revision number: 16

Vendor Specific SMART Attributes with Thresholds:

ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE

1 Raw_Read_Error_Rate POSR-K 200 200 051 - 6

3 Spin_Up_Time POS--K 181 176 021 - 5950

4 Start_Stop_Count -O--CK 091 091 000 - 9586

5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0

7 Seek_Error_Rate -OSR-K 200 200 000 - 0

9 Power_On_Hours -O--CK 074 074 000 - 19297

10 Spin_Retry_Count -O--CK 100 100 000 - 0

11 Calibration_Retry_Count -O--CK 100 253 000 - 0

12 Power_Cycle_Count -O--CK 100 100 000 - 94

192 Power-Off_Retract_Count -O--CK 200 200 000 - 61

193 Load_Cycle_Count -O--CK 172 172 000 - 85551

194 Temperature_Celsius -O---K 117 106 000 - 33

196 Reallocated_Event_Count -O--CK 200 200 000 - 0

197 Current_Pending_Sector -O--CK 200 200 000 - 0

198 Offline_Uncorrectable ----CK 200 200 000 - 0

199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 0

200 Multi_Zone_Error_Rate ---R-- 200 200 000 - 1

Start_Stop_count on the first disk is 102, on the second it is 9586. Given all the symptoms this drive is going to fail soon right?

I've decided to go btrfs raid1 with the new 4 TB Ironwolfs. Thank you for you reply.