Good day,Using a ReadyNAS Duo v2 I have almost reached my 3TB capacity in X-RAID2 mode. I was looking to expand, and upon checking the SMART status of the two discs, I have found, what I believe to be problems with the DISC2.SMART Information for Disk 1Model: WDC WD30EFRX-68AX9N0 2794 GBSerial Number: WD-WMC1T0570XXXFirmware Version: 80.00A80SMART AttributeRaw Read Error Rate: 0Spin Up Time: 6050Start Stop Count: 3661Reallocated Sector Count: 0Seek Error Rate: 0Power On Hours: 8504Spin Retry Count: 0Calibration Retry Count: 0Power Cycle Count: 30Power-Off Retract Count: 25Load Cycle Count: 3635Temperature Celsius: 33Reallocated Event Count: 0Current Pending Sector: 0Offline Uncorrectable: 0UDMA CRC Error Count: 0Multi Zone Error Rate: 0ATA Error Count: 0SMART Information for Disk 2Model: WDC WD30EFRX-68AX9N0 2794 GBSerial Number: WD-WMC1T0573XXXFirmware Version: 80.00A80SMART AttributeRaw Read Error Rate: 102Spin Up Time: 6508Start Stop Count: 3645Reallocated Sector Count: 0Seek Error Rate: 0Power On Hours: 8505Spin Retry Count: 0Calibration Retry Count: 0Power Cycle Count: 29Power-Off Retract Count: 24Load Cycle Count: 3620Temperature Celsius: 34Reallocated Event Count: 0Current Pending Sector: 3Offline Uncorrectable: 0UDMA CRC Error Count: 0Multi Zone Error Rate: 0ATA Error Count: 0For my peace of mind, i have just started a full backup of the NAS.I am then relying on people here to advise me what to do next. I need more capacity, and was planning to convert the RAID to give me 6TB capacity. However, to do that, I will maybe need to buy a new WD 3TB RED.What are peoples thoughts here?I also notice that when playing GoPro3HD footage from the NAS to my iMac, I experience a lot of jitter. I think it is my mac that causes that.Thank you

The raw read error rate "stores data related to the rate of hardware read errors that occurred when reading data from a disk surface. The raw value has different structure for different vendors and is often not meaningful as a decimal number" http://en.wikipedia.org/wiki/S.M.A.R.T. ... attributesSo its not clear how high the number is. All but one of my red drives has 0 though - the exception has a 2.

I investigated on the meaning of that value some time ago. Seagate drives have very high number and it's perfectly normal. Someone involved in a business where a high number of drives were being used told me it was a nightmare to have information from the manufacturers, even though it was their interest to provide some details!Both my REDs have 0. Not sure how/if you can find out if 102 is a reason for concern or not though.

I started a backup of the c: of the nas via dashboard 19 hours ago and it had only copied 600gb of the 2.7tb so far.I am using a usb3 drive, so I would have expected it to have finished by now, but it hasn't.Does this confirm a dying disc?Can someone point me to a speed table that shows what speeds I should expect from the nas in different uses?

The Duo v2 is a low power system, it will never get near maxing out USB3. What filesystem is on the USB HDD? NTFS will be the slowest performer.

WD Red 3TB high RawReadErrorRate | NETGEAR Communities

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jhbingham

Aspirant

May 06, 2014

StephenB wrote:
I suppose you could run lifeguard on the drive (in a PC) and see if it failed.

StephenB wrote:
I suppose you could run lifeguard on the drive (in a PC) and see if it failed.

Hi, so I downloaded WD Lifeguard Diagnostics and got some interesting results:

Disc 1: Quick Scan COMPLETED 100% PASS
Disc 2: Quick Scan FAILED

Here are the results:
DISC 1

Test Option: QUICK TEST
Model Number: WDC WD30EFRX-68AX9N0
Unit Serial Number: WD-WMC1T0570693
Firmware Number: 80.00A80
Capacity: 3000.59 GB
SMART Status: PASS
Test Result: PASS
Test Time: 18:06:44, May 06, 2014

DISC 2

Test Option: QUICK TEST
Model Number: WDC WD30EFRX-68AX9N0
Unit Serial Number: WD-WMC1T0573335
Firmware Number: 80.00A80
Capacity: 3000.59 GB
SMART Status: FAIL
Test Result: FAIL
Test Error Code: 06-Quick Test on drive 2 did not complete! Status code = 07 (Failed read test element), Failure Checkpoint = 97 (Unknown Test) SMART self-test did not complete on drive 2!
Test Time: 17:58:23, May 06, 2014

Guess that means that the DISC 2 is dying? Is it work running the EXTENDED TEST and fixing the bad sectors OR should I just go ahead and order & replace this drive?

jhbingham
Aspirant
May 06, 2014
Also, just plugged in the Disc1 ONLY to the NAS and accessing the files is slow. I am also missing data despite running in X-RAID2 mode....
StephenB
Guru - Experienced User
May 06, 2014
If Lifeguard is saying the the disk failed, then I suggest getting another. If you can still exchange it at the seller, you will get a new one. If you RMA it to Western Digital, they will give you are recertified return (unless you can somehow argue them into a new one).

Not sure what is happening on disk 1. You might check the logs.
jhbingham
Aspirant
May 07, 2014
My brand new replacement WD Red 3TB arrived today.
I am wanting to install the two 3TB in my duo to give me 6TB space. RAID0

Any tips to have optimum performance before beginning? Format with certain cluster size?
Power save disabled?

Regards,
StephenB
Guru - Experienced User
May 07, 2014
No formatting - the duo v2 will redo that anyway.

Use jbod (two volumes), otherwise a failure of either drive will result in losing everything.

You'll be limited by the duo v2 performance, not much by the drives. So I don't see any need to tweak power save, etc.
jhbingham
Aspirant
May 07, 2014
Ye, i am going to backup the RAID0 to two 3TB external discs, so if the NAS RAID dies, then im still safe.
Is it possible to update the duov2 RAM to make performance better? I had the original Netgear Duo 1000 and thought i was doing a good thing moving to the V2, but it seems not so much.

Thanks for your help so far!
StephenB
Guru - Experienced User
May 07, 2014
I don't own a v2, but my understanding is that the memory is soldered onto the system board.

The duo v2 is faster than the v1, but it didn't last long enough for all the features to get into its firmware.

On RAID0, I still prefer jbod. You do need to balance storage between the two volumes, but getting it back up after a failure is quicker. You won't see any performance gain with single-volume RAID0, since the CPU is the bottleneck, followed by the network. Anyway, jbod is what I use on my RN102.
jhbingham
Aspirant
May 07, 2014
excuse my ignorance, but what is the jbod when we talk about the v2? will it still give me 6TB from my two 3TB?
StephenB
Guru - Experienced User
May 07, 2014
jbod = "just a bunch of disks" See pages 20 and following in your user manual. http://www.readynas.com/download/docume ... Nov711.pdf

jbod does gives you 6 TB total - 3 TB in a "C" volume on disk 1, and 3 TB in a "D" volume on disk 2.

RAID0 by contrast gives you 6 TB in a "C" volume. The aggregation into 1 volume is convenient, but reliability suffers.
jhbingham
Aspirant
May 07, 2014
Thanks for that! I can see that JBOD is definately more beneficial in the long run. I thought having the RAID0 would speed read/write speeds up, but I guess not going by what you say about the CPU.
If i insert my good disc from the xraid2 and the new blank disc, is the readynas able to switch over to JBOD and make two volumes like you mention? so i dont have to copy ALLL 2.7TB of data from my backup onto one of the newly created volumes?
Otherwise, I guess i will want to erase everything on the old disc and start afresh.

Thanks StephenB

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WD Red 3TB high RawReadErrorRate

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