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Re: ReadyNAS Duo v1 resynch hang.

2ndNAS
Apprentice

ReadyNAS Duo v1 resynch hang.

After creating a new share on my RN202 I went on and created a rsync backup job on the Duo.

I saw that snapshots needed to be excluded, so cancelled the backup job.
The Duo advised that I should resynch the disks, so it was started.

It would take a long time so I was not concerned that the Duo was not responding to anything, except I could open the first level menus on the Admin page.
The next day was status quo, including my connection to the Admin page was still active.
However, closing the window and reopen the connection does not show the first level menus.

Status of the Duo is visible in RAIDar-4.3.8. First column led and both disk leds are green;
but the led just after the IP-address is blinking green/yellow and the mouse displays:
Volume C: Raid level X, Resync 0% complete, Time to finish 13 hr 30 min, Speed 40MB/s; 1115 GB (60%) of 1853 GB used
This status has not changed for at least 24 hours.

The disk leds on the Duo seems to be off.


For what it's worth, I have a .ZIP file with logs dated 20230326, taken after I managed to install the fix "Workaround for  ERR_SSL_VERSION_OR_CIPHER_MISMATCH problem" so SSH might still be installed. Thank you for the step by step instructions. 

 

The Duo is a backup unit, my primary server is OK, and I have an extra disk backup.


Is it advisable to power off and hope the server will be OK after reboot,
or can I do anything else to fix the resync?

Message 1 of 13

Accepted Solutions
StephenB
Guru

Re: ReadyNAS Duo v1 resynch hang.


@2ndNAS wrote:

According to WD diagnostic tool both disks are fine. 

I suppose the next option is Reinstall firmware and/or Reset to factory defaults?


I'd probably just do the factory default.

 

You could also try just reinserting one disk (in its original slot) and booting up. 

  1. If that works, see if the data is there.  If it is, hot-insert the second disk and wait for the resync.
  2. If not, power down and try the other disk (by itself).

If both fail, just move on to the factory default.

 

 

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Message 5 of 13

All Replies
StephenB
Guru

Re: ReadyNAS Duo v1 resynch hang.


@2ndNAS wrote:


Is it advisable to power off and hope the server will be OK after reboot,


If it doesn't resolve, at some point you will have to.

 

Have you tried logging in with ssh?

 

Message 2 of 13
2ndNAS
Apprentice

Re: ReadyNAS Duo v1 resynch hang.

Hello StephenB, thanks for responding.

 

Putty could not connect to my Duo, so I figured that next step should be testing the disks using WD diagnostics tool. I have used it before so no problem, but it does take some hours per disk. Follow-up tomorrow.

Message 3 of 13
2ndNAS
Apprentice

Re: ReadyNAS Duo v1 resynch hang.

According to WD diagnostic tool both disks are fine. 

I suppose the next option is Reinstall firmware and/or Reset to factory defaults?

Message 4 of 13
StephenB
Guru

Re: ReadyNAS Duo v1 resynch hang.


@2ndNAS wrote:

According to WD diagnostic tool both disks are fine. 

I suppose the next option is Reinstall firmware and/or Reset to factory defaults?


I'd probably just do the factory default.

 

You could also try just reinserting one disk (in its original slot) and booting up. 

  1. If that works, see if the data is there.  If it is, hot-insert the second disk and wait for the resync.
  2. If not, power down and try the other disk (by itself).

If both fail, just move on to the factory default.

 

 

Message 5 of 13
2ndNAS
Apprentice

Re: ReadyNAS Duo v1 resynch hang.

Followed your advice, and first disk works in the Duo.

Inserted second disk, and resync hang again.

I will use WD diagnostic to erase the second disk and see what happens when it's put back in the Duo.

Message 6 of 13
StephenB
Guru

Re: ReadyNAS Duo v1 resynch hang.


@2ndNAS wrote:

 

Inserted second disk, and resync hang again.

 


It sounds like it could be a failing 2nd disk.  I've had disks that pass the long non-destructive test, but fail the write zeros/full erase test.

 

Last time I checked, the WD dashboard didn't include the erase test (the older Lifeguard software did).

Message 7 of 13
2ndNAS
Apprentice

Re: ReadyNAS Duo v1 resynch hang.

I do use the older SW and have not found problems with old disks.

 

A new disk is on order, I'm just trying to learn about this error. Do you know if  my Performance Options might have any influence on the hang:

Disable full data journaling (not ticked)

Disable journaling (ticked)

Enable fast CIFS writes (ticked)

 

Again, thanks for your help.

Message 8 of 13
StephenB
Guru

Re: ReadyNAS Duo v1 resynch hang.


@2ndNAS wrote:

Do you know if  my Performance Options might have any influence on the hang:

Disable full data journaling (not ticked)

Disable journaling (ticked)

Enable fast CIFS writes (ticked)

 


It shouldn't.  The resync is just the RAID re-mirroring the two disks (copying each sector from one to the other in the case or RAID-1).

 


@2ndNAS wrote:

I do use the older SW and have not found problems with old disks.

 


And you also used the full write-zeros test in Lifeguard?

 

Also what disks are you using?  Many new drives 2 TB and under are SMR.  They can have very slow sustained write times, so operations like resync could take quite a while.

 

 

Message 9 of 13
2ndNAS
Apprentice

Re: ReadyNAS Duo v1 resynch hang.

I used the FULL erase function, but I don't know the kind of data it writes.

 

My disks are WD20EFRX and I have spend some time educating myself about the difference between WD20EFAX and WD20EFZX, and then what is CMR vs SMR. I suppose the compatibility-list is no longer updated, so I have chosen to stay with the CMR version.

 

Thanks again for your help.

Message 10 of 13
StephenB
Guru

Re: ReadyNAS Duo v1 resynch hang.


@2ndNAS wrote:

I used the FULL erase function, but I don't know the kind of data it writes.

 


It zeros the disk.

 


@2ndNAS wrote:

I suppose the compatibility-list is no longer updated,


Very true.  I always recommend NAS-purposed CMR drives for the Duo and NV+ models.  WD Red Plus (not Reds) and Seagate IronWolf are good choices.  Enterprise-class drives are also fine, but IMO overkill, given the limited performance of these particular models.

 

Note that the WD20EFRX is CMR (and is now branded as a WD Red Plus).

 


@2ndNAS wrote:

what is CMR vs SMR.


See https://en.wikipedia.org/wiki/Shingled_magnetic_recording

 

PMR is an older name for CMR (for a specific CMR technology).

 

The general issue with SMR is that writing to track X destroys the data on track X+1.  That creates a rippling

  1. read track X+1, write track X,
  2. read track X+2, write track X+1
  3. read track X+3, write track X+2
  4. ...

That continues until you reach the end of the SMR zone (where there is an unused track).  The manufacturers overcome the obvious write performance issue with a lot of cache and attention to the caching algorithm.  But sustained writes will overhelm that eventually, and you will always end up with glacially slow write performance at some point.

 

Best not to use these drives with RAID in any form.  Both WD and Seagate are now identifying SMR/CMR on their datasheets.

 


@2ndNAS wrote:

WD20EFAX and WD20EFZX,


Both are SMR, so I don't recommend either.

 

In general, assume any hard drive <= 6 TB is SMR unless you have manufacturer specs that say otherwise. 

Message 11 of 13
2ndNAS
Apprentice

Re: ReadyNAS Duo v1 resynch hang.

Message 12 of 13
StephenB
Guru

Re: ReadyNAS Duo v1 resynch hang.


@2ndNAS wrote:

Are you sure WD20EFZX is SMR?

 

https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/pro...


Sorry - I misread the number.  All WD Red Plus drives are CMR, so it is fine.

 

 

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