Successfully completed diagnostics

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claynz wrote:

 which disk is it?

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Download the full log zip from the web ui.  Then look in mdstat.log - it will tell you what device is in what array.

For instance, in one of my systems you can see that md127 uses sda:

Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] 
md126 : active raid1 sdb3[0]
      5855671808 blocks super 1.2 [1/1] [U]
      
md127 : active raid1 sda3[0]
      5855672832 blocks super 1.2 [1/1] [U]

Then look in disk-info.log, and it will tell you the bay, disk type, and serial number.  For instance, in my own system...

Device:             sda
Controller:         0
Channel:            0
Model:              WDC WD60EFRX-68L0BN1
Serial:             WD-xxxxxxxxxx

The "channel" is the bay - note it starts from 0, not 1.

While there, you should also look at the SMART stats for the drive, and see if there are any issues.  Drives can/do fail even with good SMART stats, but it's still worth a look.

There could be other clues in system.log and kernel.log on disk issues.

If you take the disk out for testing, power the NAS down first, and keep it powered down until you return the disk.