Unraid 6.3.3 - Errors during parity disk replacement

[johnnya1306]

Hi,

 

Started parity rebuild with freshly precleared, new WD 4Tb RED last night.  Woke up to what looked like an array disk showing I/O errors and parity build slowed to a crawl (xx.x Kb/sec).  Syslog zip attached, sent here by "Fix Common Problems".  I know my disks are old but they all passed preclear (I'm upgrading from WHS v1).  Still have last good parity disk which was being replaced but system won't recognize as such.  Restarted parity rebuild after stopping to investigate.  What do I need to do to get to next stable point?

 

Thanks in advance for any help,

John

tower-diagnostics-20170513-0613.zip

[JorgeB]

Disk13 needs replacing:
 

Device Model:     SAMSUNG HD204UI
Serial Number:    S2H7J9BB104868
197 Current_Pending_Sector  0x0032   077   077   000    Old_age   Always       -       2851

 

[johnnya1306]

OK, thanks!

I'm working on replacing them all.

Not sure how to go about it.

The system won't recognize the old parity disk and I can't complete a new parity rebuild.

I have new drives available and the old parity drive.

[JorgeB]

7 minutes ago, johnnya1306 said:

I have new drives available and the old parity drive.

 

Was anything written (or any change) to the array after removing the old parity?

[johnnya1306]

Just installed Krusader but haven't touched the  array.

 

[JorgeB]

Since you're not using cache the docker files are on the array, so there were changes and old parity is not valid anymore, you can still use it to rebuild disk13 but there will be some corrupt files.

[johnnya1306]

When I first stopped the rebuild, before doing anything, I put the original parity disk back.

It wasn't recognized as the original (valid) parity disk.

How do I use the original parity disk to restore the array?

Won't it just effectively "uninstall" Krusader?

[JorgeB]

4 minutes ago, johnnya1306 said:

Won't it just effectively "uninstall" Krusader?

 

No, krusader will remain installed and because of it and any other changes old parity is no longer valid, disk13 looks really bad so you can still try a rebuild using the old parity and then replace all files you can copy from the old disk.

 

To do it you need to do a new config (select retain all disks) with the old parity and current disk13, check the box "parity is already valid" before starting the array, start array, stop array, power down, replace disk13, power back up, assign new disk, start array to begin rebuild.

[johnnya1306]

There isn't a "parity is already valid" box.

Only "replacement disk installed"

[JorgeB]

You need to do a new config, tools -> new config -> retain all disks

 

Then assign old parity and don't forget to check the box before starting the array.

[johnnya1306]

OK, great, Thanks!

Gotta preclear new drive first.

Uncheck "write corrections to parity" before rebuild, right?

[JorgeB]

7 minutes ago, johnnya1306 said:

Uncheck "write corrections to parity" before rebuild, right?

 

That option won't be available before a rebuild, it's only for parity checks.

[johnnya1306]

Should I uninstall Krusader before rebuild?

[JorgeB]

It doesn't matter now, leave it be.