[SOLVED]Yet ANOTHER...'Replacing Drives' Question

[CDLehner]

Sitting patiently…mostly.

[trurl]

Let me ping @JorgeB on yet another thread. He often recommends cloning. It is way past bedtime in his part of the world so might be a few hours if he wants to get involved.

 

Also, since they were the ones to suggest cloning and reiserfsck originally, let's see if @itimpi and @JonathanM want to help out.

[CDLehner]

^ Thanks so much!

[JonathanM]

Short summary, positively identify the source and destination /dev/sd? devices, then issue a terminal command

 

dd if=/dev/sd(source) of=/dev/sd(destination) bs=1M conv=noerror,sync

 

Be VERY sure of the destination disk you put in the of (output file) section of the command, you really don't want to overwrite the wrong drive.

[JonathanM]

Because Unraid doesn't always keep static /dev/sdX designations between boot cycles, it is vitally important to identify the source and destination /dev/sdX immediately before starting the dd command, don't reboot and trust the letters are the same.

[trurl]

7 hours ago, CDLehner said:

I think I might as well use disk5, as my "clone"

This makes things more complicated. To get disk5 out of the array you are going to have to New Config/Rebuild parity before you could use it as the clone destination.

[CDLehner]

So...I won't use disk5, as trurl cautions; I'll put a 3T drive, I had previously copied and removed back in.

 

And this is the CLONE...

 

12 hours ago, JonathanM said:

dd if=/dev/sd(source) of=/dev/sd(destination) bs=1M conv=noerror,sync

 

Do this with array on or off? Do I need to do anything, to the RECEIVING disk...before running this command?

[CDLehner]

Here is the RECEIVING drive...

 

 

Assign it...or just run of=/dev/sdf?

[trurl]

1 hour ago, CDLehner said:

Do this with array on or off?

off

1 hour ago, CDLehner said:

do anything, to the RECEIVING disk...before

no

46 minutes ago, CDLehner said:

Assign it

definitely NO

[trurl]

47 minutes ago, CDLehner said:

of=/dev/sdf

what will be if=/dev/sdX ?

 

13 hours ago, JonathanM said:

vitally important to identify the source and destination /dev/sdX immediately before starting the dd command

 

[CDLehner]

Is there somewhere, I can watch progress?

 

[JonathanM]

2 hours ago, CDLehner said:

Is there somewhere, I can watch progress?

Not really, had you pressed enter yet in that screenshot? I was thinking the blinking cursor would be at the beginning of the first blank line after you press enter.

 

If you haven't hit enter yet, you could add status=progress to the command, separated by a space of course.

dd if=/dev/sdi of=/dev/sdf bs=1M conv=noerror,sync status=progress

 

[CDLehner]

∆ That screenshot, was before ENTER; so yes...now I just have the blinking cursor, below the command line.

 

Damn I wish I could have added the status=progress. How do I know when it's done!?

 

When [email protected] is back? Did someone say, expect upwards of 3 days??

[CDLehner]

1 hour ago, CDLehner said:

That screenshot, was before ENTER; so yes...now I just have the blinking cursor, below the command line.

 

FTR...not blinking

 

 

 

[CDLehner]

Hmm: when I walked in to check on this...the 1st thing I've been looking at, is the drive activity light on the slot I know I'm pulling from. NO LIGHT.

 

I was happy, to see this...meaning it seemed to be done; but, of course...as you can see...some errors.

 

What do we think gents?

 

Edited February 12 by CDLehner

[JonathanM]

3 hours ago, CDLehner said:

I was happy, to see this...meaning it seemed to be done; but, of course...as you can see...some errors.

 

What do we think gents?

Looks good. The "error" is expected, we didn't tell dd when to quit, so it just ran until it got to the end of the device.

 

Now run

reiserfsck --scan-whole-partition --rebuild-tree /dev/sdf1

[CDLehner]

Be still my heart! 💜🙏

[CDLehner]

^ Failed to open device sdf1. Didn't want to question...but was that a typo? Just sdf, right?

[JonathanM]

Try rebooting, don't start the array, verify the sd? designation of the clone destination, and try the command again, be sure to add the 1, that's not a typo, it designates the first partition on the device.

[CDLehner]

OK...rebooted; CLONE is still sdf

 

 

Re-established TelNet (PuTTY)

 

Edited February 12 by CDLehner

[JonathanM]

Try reiserfsck --check /dev/sdf1

and see what it says. Since the drive was formatted XFS I'm not expecting it to find the deleted file system, but it won't hurt to try.

[CDLehner]

Same

 

[JonathanM]

Well, since we are playing with the cloned device, and haven't touched the original, we can get experimental. If things don't work, we can always do the clone command again to start over.

So, lets try formatting as reiserfs to overwrite the XFS stuff.

mkreiserfs /dev/sdf1

Then try the scan whole partition rebuild tree command.

[CDLehner]

[CDLehner]

Oh, wow; that was quicker than I thought it would be.