ReadyNAS NV+V2 Problems With Disk Failure + Disk Unrecoverable Errors

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wildwood wrote:

My concern in that disk 4 with increasing uncorrectable errors may fail before the first resync so I am considering taking a new full backup of the unit before doing anything.

I agree this needs to be a priority.

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wildwood wrote:

 

 

I assume that I need to do the following:
1. resolve the disk 2 issue first by replacing the disk and allowing a resync.
   then
2. resolve the disk 4 issue first by replacing the disk and allowing a resync.

 

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A slight variation is to power down the system after the backup and then clone disk 4.  Use the clone instead of the original, and perhaps also remove disk 2 before you boot up.   Then insert the replacement for disk 2.  The clone needs to be a sector-by-sector copy.

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wildwood wrote:

The unit is a ReadyNAS NV+V2 (RND4000) fitted with 4 x 3TB Seagate Barracuda ST3000DM001 Disks in a Flex-RAID (Raid 5) volume, 

 

Unfortunately this particular disk model has a rather high failure rate in raid arrays (not just ReadyNAS).  I suggest that you replace these disks with a different model - going with NAS-purposed drives instead of desktop.

WDC WD30EFRX are good choices, as are Seagate IronWolf ST3000VN007.  You could also use the Red Pro and Ironwolf Pro models if you want 7200 rpm. Personally I find the Red drives to have good performance, and like the cooler temps that the slower rotation speed enables.