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Aspirant

Dec 12, 2016

ReadyNAS 516 + 2x EDA500 - Scrub on EDA500 very slow

I am trying to be dilligent on filesytem maintenance and disk tests to prevent issues going forward. I have scheduled, every 4 months each of the following maintenance operation on the different vol...

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dbreiny1

Aspirant

Dec 14, 2016

So now, after 36 hours running a scrub on an EDA500 volume (vol2) the process is only at 4.24%. The volume is 5x WD60EFRX in RAID6 configuration (16TB). This is really un-usable with the current performance. If I lost a drive and it took over 30 days to rebuild the volume the risk is very high to lose the data. I need to understand why it is so slow and speed it up, or I need to find another array that will work properly. The drives in the RN516 are WD30EFRX in RAID 6 and the scrub on it ran to completion in about 18 hours, why is the EDA500 so slow?

sotrack
Luminary
Dec 14, 2016
The drives in the RN516 are WD30EFRX in RAID 6 and the scrub on it ran to completion in about 18 hours

What is free space on internal volume vol1? And vol2,vol4?

My Ultra6 has 6x4Gb HDD in RAID-5 992.36 Gb free of 18.17 Tb

Thu Dec 1 2016 11:20:52 Volume: Scrub started for volume data
Wed Dec 7 2016 18:24:09 Volume: Scrub completed for volume data
~7.5 days
Processor was ~100% busy this time for parity information recalculation
Raid-6 require double parity information calculation and can take ~15 days
- dbreiny1
  Aspirant
  Dec 14, 2016
  Good question.
  
  The volume I have been trying to scrub is on an EDA500 (external chassis) plugged into a RN516. The volume is 16.1TB in size and there are 6.49TB free. Keep in mind that I can scrub a volume that is NOT on the external chassis, 10.9TB in size, in about 18 hours total.
  - dbreiny1
    Aspirant
    Dec 14, 2016
    The other volumes in this array are the following:
    /vol1 - 10.9TB total - 2.06TB free
    /vol2 - 16.3TB total - 6.49TB free (EDA500)
    /vol4 - 16.3TB total - 3.80TB free (EDA500)