NAS540 Volume status shows resyncing

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Hi

I m using NAS540(4 disks, raid5) for years and did not make any change. When I was copying file(SMB) suddenly I could not access my share drive. As I checked, it shown resyncing in Storage Manager > Volume > Volume status.

I don't know why it started to resync, I did not do anything.

I'm not sure the storage is degraded or not. It shows "Storage Status: Warning" at home screen but in Storage Manager > Overview, it shows "Healthy" and Volume on RAID shows no degraded.

I also check S.M.A.R.T and 4 HDD status are green but when I click on Disk3, it shows BAD and Status: Danger with 5 Reallocated_Sector_Ct (detail below)

I m not sure because of DISK 3 or not but the status showing green. Should I change disk3? Can I change it with 1TB disk? (I'm using all 2 TB disk and I only use around 60% of volume, so I m considering to reduce my HDD size.)

ItemValue

Power_On_Hours

8685 hour(s)

Spin_Retry_Count

0

Reallocated_Sector_Ct

5

Model Family

Western Digital Caviar Green (AF)

Device Model

WDC WD20EARS-19MVWB0

Serial Number

WD-WCAZA4120898

LU WWN Device Id

5 0014ee 25ad78d8d

Firmware Version

51.0AB51

User Capacity

2.00 TB

Sector Sizes

512 bytes logical, 4096 bytes physical

ATA Version

ATA8-ACS (minor revision not indicated)

SATA Version

SATA 2.6, 3.0 Gb/s

Local Time

Wed Feb 28 20:06:38 2024 GMT

SMART support

Available - device has SMART capability.

SMART support

Enabled

S.M.A.R.T - Disk3

OverviewS.M.A.R.T InfoIDAttributeValueWorstThresholdTypeUpdatedWhen
FailedRaw Data

1

Raw_Read_Error_Rate

200

200

051

Pre-fail

Always

-

0

3

Spin_Up_Time

243

168

021

Pre-fail

Always

-

2841

4

Start_Stop_Count

099

099

000

Old_age

Always

-

1930

5

Reallocated_Sector_Ct

200

200

140

Pre-fail

Always

-

5

7

Seek_Error_Rate

200

200

000

Old_age

Always

-

0

9

Power_On_Hours

089

089

000

Old_age

Always

-

8685

10

Spin_Retry_Count

100

100

000

Old_age

Always

-

0

11

Calibration_Retry_Count

100

100

000

Old_age

Always

-

0

12

Power_Cycle_Count

100

100

000

Old_age

Always

-

593

192

Power-Off_Retract_Count

200

200

000

Old_age

Always

-

504

193

Load_Cycle_Count

192

192

000

Old_age

Always

-

26448

194

Temperature_Celsius

105

095

000

Old_age

Always

-

45

196

Reallocated_Event_Count

197

197

000

Old_age

Always

-

3

197

Current_Pending_Sector

200

200

000

Old_age

Always

-

1

198

Offline_Uncorrectable

200

200

000

Old_age

Offline

-

0

199

UDMA_CRC_Error_Count

200

200

000

Old_age

Always

-

37

200

Multi_Zone_Error_Rate

200

200

000

Old_age

Offline

-

7


All Replies

  • Mijzelf
    Mijzelf Posts: 2,638  Guru Member
    First Anniversary 10 Comments Friend Collector First Answer
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    In itself a Reallocated_Sector_Ct of 5 isn't alarming. It is only a problem when it's growing fast. But it can cause a degraded array, and so can the Current_Pending_Sector of 1. The latter is mildly surprising. I'd expect that to be zero after a rebuild. (A Current_Pending_Sector is a sector which is physically fine, but has a wrong checksum, so the content is basically unknown. A read will cause an I/O error (which can cause a drop from the array), but after a write it's OK.)

    Should I change disk3?

    When you have a decent backup I wouldn't worry about this disk, given the information you provided. (And you should have a backup. The box will fail, some day. And no, raid is not a backup.)

    Can I change it with 1TB disk?

    Not with raid5. With some manual work it is possible to shrink the array in a way that a 1TB member can be used, but then the remaining space is 50%.

  • nat_ntsb
    nat_ntsb Posts: 2
    First Comment
    edited March 4
    Options

    Hi

    Thanks for answering.

    I'm thinking about the backup as you mentioned. I decided to use raid5 because thought it is backup but the maintenance fee is quite high. As I'm using only 60% of raid5 volume, I think 3TBx2 with raid 1 will be more suitable for my case.

    But I still have 3 usable 2TB disks. Can I use 3TB disk to join this raid5 first? will it be working? Does it require any specific configuration? Later if 2TB disk fails, I will add more 3TB and change to raid 1.

  • Mijzelf
    Mijzelf Posts: 2,638  Guru Member
    First Anniversary 10 Comments Friend Collector First Answer
    Options

    Yes, you can without problems use a disk which is bigger than the disk to be replaced.

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