SMART on WD Green is working ?

[phoenix73]

Hi all

 

Yesterday I got an email from my NAS about read errors after 5 tries.

I rebooted system and did a quick SMART test on both disks, no error reported.

 

Today, same problem and I took a look in /var/log/messages via ssh

 

Jun  7 23:14:58 MyNas kernel: [  689.255816] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0
Jun  7 23:14:58 MyNas kernel: [  689.255818] ata1.00: irq_stat 0x40000008
Jun  7 23:14:58 MyNas kernel: [  689.255822] ata1.00: failed command: READ FPDMA QUEUED
Jun  7 23:14:58 MyNas kernel: [  689.255828] ata1.00: cmd 60/08:00:c0:50:11/00:00:01:00:00/40 tag 0 ncq 4096 in
Jun  7 23:14:58 MyNas kernel: [  689.255829]          res 41/40:00:c0:50:11/00:00:01:00:00/40 Emask 0x409 (media error) 
Jun  7 23:14:58 MyNas kernel: [  689.255832] ata1.00: status: { DRDY ERR }
Jun  7 23:14:58 MyNas kernel: [  689.255834] ata1.00: error: { UNC }
Jun  7 23:15:02 MyNas kernel: [  695.867866] ata1.00: read unc at 17912064
Jun  7 23:15:02 MyNas kernel: [  695.867872] lba 17912064 start 9453280 end 3907015007
Jun  7 23:15:02 MyNas kernel: [  695.867874] sda5 auto_remap 0
Jun  7 23:15:02 MyNas kernel: [  695.867880] ata1.00: exception Emask 0x0 SAct 0x3 SErr 0x0 action 0x0
Jun  7 23:15:02 MyNas kernel: [  695.867883] ata1.00: irq_stat 0x40000008
Jun  7 23:15:02 MyNas kernel: [  695.867887] ata1.00: failed command: READ FPDMA QUEUED
Jun  7 23:15:02 MyNas kernel: [  695.867893] ata1.00: cmd 60/08:00:00:51:11/00:00:01:00:00/40 tag 0 ncq 4096 in
Jun  7 23:15:02 MyNas kernel: [  695.867894]          res 41/40:00:00:51:11/00:00:01:00:00/40 Emask 0x409 (media error) 
Jun  7 23:15:02 MyNas kernel: [  695.867897] ata1.00: status: { DRDY ERR }
Jun  7 23:15:02 MyNas kernel: [  695.867899] ata1.00: error: { UNC }
Jun  7 23:15:05 MyNas kernel: [  699.612299] ata1.00: read unc at 17912064
Jun  7 23:15:05 MyNas kernel: [  699.612304] lba 17912064 start 9453280 end 3907015007
Jun  7 23:15:05 MyNas kernel: [  699.612307] sda5 auto_remap 0
Jun  7 23:15:05 MyNas kernel: [  699.612313] ata1.00: exception Emask 0x0 SAct 0x3 SErr 0x0 action 0x0
Jun  7 23:15:05 MyNas kernel: [  699.612315] ata1.00: irq_stat 0x40000008
Jun  7 23:15:05 MyNas kernel: [  699.612319] ata1.00: failed command: READ FPDMA QUEUED
Jun  7 23:15:05 MyNas kernel: [  699.612325] ata1.00: cmd 60/08:08:00:51:11/00:00:01:00:00/40 tag 1 ncq 4096 in
Jun  7 23:15:05 MyNas kernel: [  699.612326]          res 41/40:00:00:51:11/00:00:01:00:00/40 Emask 0x409 (media error) 
Jun  7 23:15:05 MyNas kernel: [  699.612329] ata1.00: status: { DRDY ERR }
Jun  7 23:15:05 MyNas kernel: [  699.612331] ata1.00: error: { UNC }
Jun  7 23:15:09 MyNas kernel: [  703.345645] ata1.00: read unc at 17912064
Jun  7 23:15:09 MyNas kernel: [  703.345650] lba 17912064 start 9453280 end 3907015007
Jun  7 23:15:09 MyNas kernel: [  703.345653] sda5 auto_remap 0
Jun  7 23:15:09 MyNas kernel: [  703.345659] ata1.00: exception Emask 0x0 SAct 0x3 SErr 0x0 action 0x0
Jun  7 23:15:09 MyNas kernel: [  703.345661] ata1.00: irq_stat 0x40000008
Jun  7 23:15:09 MyNas kernel: [  703.345665] ata1.00: failed command: READ FPDMA QUEUED
Jun  7 23:15:09 MyNas kernel: [  703.345671] ata1.00: cmd 60/08:00:00:51:11/00:00:01:00:00/40 tag 0 ncq 4096 in
Jun  7 23:15:09 MyNas kernel: [  703.345673]          res 41/40:00:00:51:11/00:00:01:00:00/40 Emask 0x409 (media error) 
Jun  7 23:15:09 MyNas kernel: [  703.345675] ata1.00: status: { DRDY ERR }
Jun  7 23:15:09 MyNas kernel: [  703.345677] ata1.00: error: { UNC }

 

No more doubt disk1 has defect sectors.

I shutdowned NAS, remove disk 1 and NAS restarted from disk 2 in degradated mode.

 

Question :

 

- Why did SMART didn't reports any errors before this failure ?

- SMART on WD Green is safe ?

- Do you thing Data Lifeguard Diagnostic for Windows will be able to fix bad sectors and remap them or should I send disk to repair ?

 

Thanks for your help