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Removing disk from Array, adding a new one and more

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  • Community Expert
1 minute ago, trurl said:

I think you have to remove a device, let the balance complete without that device, then add the new device.

Or you can add the new device, let the balance complete, then remove the device. Something like that.

 

I don't think you can just remove and replace all at once since it needs the contents of all devices in the pool to allow it to rebalance for added or removed devices.

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  • 6.9.2?   Your screenshot shows the array started with no disks missing. I think you must mean that disk8 is not assigned. A missing disk would be indicated by a red X and its contents would

  • What do you mean "fix Disk 8"? Since it isn't missing, do you just mean that you want some disk assigned as disk8 so there isn't a gap?

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  • Author

I will remove the sdf disk that causes all these messages. Let the array to finish parity check, and I can stay with one SSD on my cache pool I suppose... for now.

Then we'll see if it errors again I suppose?

Thank you both for all the help!

  • Community Expert

The pool failed to remove the missing device due to data corruption, if you haven't yet you should run memtest, then see here to monitor the pool for future errors.

  • Author

I am rebuilding my data now. I will do memtest when this is over. 

Can unraid be online when memtest is happening? Cause I have so many things inside that I cant have it off for whole day!

 

Thank you!

  • Community Expert
1 minute ago, piratx said:

Can unraid be online when memtest is happening? Cause I have so many things inside that I cant have it off for whole day!

No. 

Memtest runs at the bare metal level and takes over the whole machine while running.

  • Author

And it takes up to x days for 32gb or its just hours? :(

It's better to remove the dimms install them to a pc and then after the memtest says its ok put them back on..

 

  • Community Expert

1 pass should be a few hours, less if errors are detected soon.

  • Community Expert
1 hour ago, piratx said:

It's better to remove the dimms install them to a pc and then after the memtest says its ok put them back on.

No.

 

You want to carry out the test on the machine where the RAM is going to be installed as you are testing not just the dimms but also the ability of the CPU and motherboard memory controller to handle the RAM at the clock speed set for the RAM.

 

  • Author

Thank you for letting me know. Well first I need to let data rebuild finish. 

Then I'll deal with the RAM. I've used common ones 

 

Quote

Memory: 32 GiB DDR4 (max. installable capacity 64 GiB)

 G-Skill F4-2666C19-8GIS, 8 GiB DDR4 @ 2666 MT/s 

G-Skill F4-2666C19-8GIS, 8 GiB DDR4 @ 2666 MT/s 

G-Skill F4-2666C19-8GIS, 8 GiB DDR4 @ 2666 MT/s 

G-Skill F4-2666C19-8GIS, 8 GiB DDR4 @ 2666 MT/s

it's not something need to change values on BIOS etc. I hope.. :)

  • Community Expert
2 hours ago, piratx said:

first I need to let data rebuild finish. 

Then I'll deal with the RAM

You don't even want to run a computer unless the RAM is trustworthy. Everything goes through RAM, your data, the OS code, everything. If the RAM isn't trustworthy then it would likely affect that data rebuild you are wanting to finish first.

  • Author

Then I should go with my backup plan, if you masters say its good. I wont have any issue with 16GB for starters.. So maybe I can memtest those 16GB RAM dimms first and then the other set. All these just to make sure the server will not be off for long :)

 

No? TIA

  • Community Expert
3 minutes ago, piratx said:

go with my backup plan

What plan is that?

  • Author

Memtest 16GB (2 dimms) each time. 

This way it wont take long to test and if the 1st set is ok, I can stay with that RAM for a while and test the other 2 dimms next month or something. 

  • Community Expert

Depends on how you do the test. In addition to testing the specific memory sticks, testing the memory slots is important. Could be if the memory sticks test OK, but all memory slots haven't been tested, then you would still have a problem when you filled all slots.

  • Community Expert

Really makes more sense to do the test with the hardware exactly as you intend to use it instead of trying to take shortcuts.

 

Likely if there is a problem it will be detected quickly and you won't have to run the whole pass.

  • Author

The only reason I am not stopping the parity/data rebuild now is cause I made a new config, cause of the change of the cache SSD.

But it will be done in 3-4 hours.

Quote

Estimated finish:3 hours, 56 minutes

Memtest is an option on boot blue Unraid window?

  • Community Expert
1 minute ago, piratx said:

Memtest is an option on boot blue Unraid window?

Yes, but that builtin memtest only works if you are booting Legacy and not running ECC RAM. It won't work if you are booting UEFI.

 

You can download the latest memtest and boot it from another flash drive.

  • Author

Like medicat and boot from USB right?

  • Community Expert
Just now, piratx said:

medicat

typo?

 

I don't understand that post.

  • Community Expert

Never used that and unclear from that page if it includes memtest though you would hope something as basic as memtest would be part of that toolkit.

 

Is that the first thing that came up when you googled memtest?

2 minutes ago, JonathanM said:

That is what I get first from google and what I consider the official memtest

  • Author

I am using that usb stick a lot. 

I know it have MemTest86 Pro 8.3 on it

15 minutes ago, piratx said:

I am using that usb stick a lot. 

I know it have MemTest86 Pro 8.3 on it

That's an old version, and Pro is not available for free.

I recommend downloading the current version directly from the legitimate site, not an old version from some questionable source.

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