Volume failure after upgrading My Cloud Mirror 2 to OS5 5.05.111

Hello there,

I have just upgrade my My Cloud Mirror 2 to OS5 5.05.111. The process completed successfully without any errors messages. I was able to rest my user (creating new password) and access the dashboard. However, later an “Volume Failure. The data volume 1 on the drive is not accessible. Code:4” critical error message appears. The HDD LEDs turns red. Capacity turns to 0.00 MB free and I could not access the drive on local network to get the data at all.

I check the storage tab and it says “No Configured Volumes. Setup a RAID Mode to configure new RAID Volume(s) on this device.”,“Disk Health: Healthy”

I used the drive normally before the upgrade in “Spanning Configuration”.

Please help me to sort this problem out or tell me how to! get my data out. Many thanks!

Screen Shot 2020-11-23 at 02.07.59|690x406

@winnd4spd What size HDD and Volume did you have configured with your Mirror Gen2?
Mirror Gen2 shipped from the factory with a max of (2) 8 TB HDD in RAID1 so a max of 16 TB volume total.

Did you have a volume larger than 16 TB?

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Hello @SBrown,

Thanks for your reply.

I have 2X10TB and was running spanning of total 20TB on it previously.

Are there anyway I can fix it or get my data out in this situation?

@winnd4spd Unfortunately, My Cloud OS 5 doesn’t support a volume larger than 16 TB on the My Cloud Mirror Gen2 so it cannot mount the volume. One solution would be to upgrade the enclosure to an EX2 Ultra which does support larger volumes in OS 5, or if you have a backup, reconfigure the disk with RAID1 and 10 TB Volume.

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@SBrown I see. Thanks for the info.

The idea is that I need to get my data out of it before I can reconfigure the disks. I wonder if any of these options would work:

OP1: Get a new EX2 Ultra then swap the disks into it and use the disks straight forward, perhaps?

OP2: Swap the disks with other My Cloud Mirror Gen 2 running OS3 to temporary get my data out of it (because we can not downgrade from OS5 to OS3, right?).

If option 1 and 2 are possible, do it need to configure anything on the enclosure before doing so?

OP3: Manualy get my data out using dock with computer (Last resort option as I might need a guideline how to do so).

Looking forward for your advices.

. .another option would be to for WD to change the HDD limit to something above 16TB.

Considering that the unit ran fine with 20TB with OS/3. . .I suspect the hardware is capable?

A few thoughts:

  • From the WD Reply; I take it that you can just drop the volumes from the Mirror to an EX2 (roaming?) and life is good?

  • QUESTION: What is the software capacity limit of the EX2 Ultra?

  • QUESTION: What happens if you pull out one disk? Is the other disk readable; or does it recognize that 1/2 the volume is missing? If that is the case. . . .seriously reconsidering running these as spanned volumes in the future; since a failed HDD will result in ALL data lost. The odds of one drive failing in a two drive system is DOUBLE the odds of a single drive failing. . .

  • I would look into the other options you are considering as well

  • . . . .hint- - -if you look in the transmission threads; I think someone found a way to roll back to OS/3. . . .but that was likely for a different NAS (a PR4100? Can’t remember - - -and there may be some important differences in the way the “recovery partition” is set up.)

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Thanks for joining @NAS_user.

I have the same thought that the My Cloud Mirror Gen2 are working well with 20TB previously so it should be able to work with the new OS5 which I feel is faster (from how quick I get into the Dashboard so far).

@SBrown said that the EX2 Ultra works with 20TB. However, I wonder if a hot swap can work straightway?

Finding a way to rollback to OS3 could be a solution for me. Thanks for the idea.