HiI have 2x8TB Seagate Archive HDDs in JBOD array in a Ultra4 on 6.4.0 production.I started doing a rsync backup (this device was the destination) and after about 10min the second drive showed up as failed.The device still reported 'healthy' on the first page, the volume size was still 14TB and the backup continued OK.I took the drive out and ran SeaTools - it passed the self test, short test and long test with no problems.Logs emailed.I know these drives, when subjected to a sustained write, can slow down periodically - is the NAS mis-interpreting this as a failure??ThanksA

If the backup succeeded, then the drive clearly wasn't dead. Probably someone from Netgear would need to troubleshoot the false status though. If you have a 14 TiB volume, then you aren't running JBOD. You must be spanning both drives with RAID-0. The risk there is that a failure of either drive will lose all the data on both. Two 8 TB volumes are much safer.

It says JBOD on the status page. Each drive is 7.2 formatted I think so 14.4 in total. Edit:From volume.log Pool backup: Device: /dev/md126 Node: 9:127 HostID: 5e26b038 (native) UUID: 635f4fc7-2874-40a5-965f-1d738131aaf7 Mount point: /backup Size: 15616260544KB (14892 GB) Available: 15615978408KB (14892 GB) RAID Level: JBOD State: unprotected Action: idle Flags 0x148 Type: btrfs RAIDs: md127 Size: 15618353664 Level: 0 Action: idle Members: 1 md126 Size: 15618353664 Level: 1 Action: idle Members: 1 It was also quick to set up and add second disk - few minutes - whereas I think (although I may be wrong) to set up RAID would take a few hours to initialise an array - especially with these disks.

Do you have two volumes or only one? My guess is only one from the log. If one, it is spanning RAID-0 no matter what volume.log says. And if either disk fails you lose the data on both.

Only 1 volume. So a test would be to pull one and see what happens?? ThanksA

powellandy1 wrote: So a test would be to pull one and see what happens?? I wouldn't recommend that unless you want to lose your data.

8TB Drive drops out of JBOD volume on 6.4.0 on Ultra4

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StephenB
Guru - Experienced User
Oct 10, 2015
If the backup succeeded, then the drive clearly wasn't dead. Probably someone from Netgear would need to troubleshoot the false status though.

If you have a 14 TiB volume, then you aren't running JBOD. You must be spanning both drives with RAID-0. The risk there is that a failure of either drive will lose all the data on both. Two 8 TB volumes are much safer.
- powellandy1
  Virtuoso
  Oct 10, 2015
  It says JBOD on the status page. Each drive is 7.2 formatted I think so 14.4 in total.
  
  Edit:
  From volume.log
  
  Pool backup: Device: /dev/md126 Node: 9:127 HostID: 5e26b038 (native) UUID: 635f4fc7-2874-40a5-965f-1d738131aaf7 Mount point: /backup Size: 15616260544KB (14892 GB) Available: 15615978408KB (14892 GB) RAID Level: JBOD State: unprotected Action: idle Flags 0x148 Type: btrfs RAIDs: md127 Size: 15618353664 Level: 0 Action: idle Members: 1 md126 Size: 15618353664 Level: 1 Action: idle Members: 1
  It was also quick to set up and add second disk - few minutes - whereas I think (although I may be wrong) to set up RAID would take a few hours to initialise an array - especially with these disks.
  - StephenB
    Guru - Experienced User
    Oct 10, 2015
    Do you have two volumes or only one?
    
    My guess is only one from the log.
    
    If one, it is spanning RAID-0 no matter what volume.log says. And if either disk fails you lose the data on both.

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8TB Drive drops out of JBOD volume on 6.4.0 on Ultra4

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