[SOLVED] Replace drive in 3 drive setup

[alphasi1]

Hi everyone

I've got 3 drives in ZFS.

500GB
500GB
250GB
Spare bay

I've bought two 500GB drives. I want to remove the 250GB drive and add the two 500GB drives, ideally without losing data. The data is not critical at all, it'll just save some hassle to replace the drives without loss.

I've tried shutdown > replace 250GB with 500GB > startup but the pool is no longer found.
I've tried working out how to add a 500GB to the spare bay and replace the 250 with it, but I can't work out how to do that either!

What's the correct process, please? If it's just to remove the 250, add the 2 x 500 and start again that's fine - but I thought I could do it more elegantly!

Thanks in advance.

[ms49434]

Please provide more details about your ZFS pool by posting the output of Disks > ZFS > Pools > Information.

[alphasi1]

Sure! Here it is - thank you.

Code: Select all

  pool: share
 state: ONLINE
  scan: none requested
config:

	NAME        STATE     READ WRITE CKSUM
	share       ONLINE       0     0     0
	  ada0      ONLINE       0     0     0
	  ada1      ONLINE       0     0     0
	  ada2      ONLINE       0     0     0
	spares
	  ada3      AVAIL

errors: No known data errors

ada2 is the 250GB drive I'd like to replace.
ada3 is one of the two new 500GB drives, I put it in as a spare thinking that might allow me to swap it with the 250GB.

11.1.0.4 - Atomics (revision 5065)

Nas4Free is running from a USB stick.

[sleid]

Your "share" pool is a stripe of 3 disks so without any redundancy so it is impossible to change a disk by a zfs command they are all refused.

Risk-free solution: back up your data (but they must be!), Rebuild the pool and restore your data.

Possible but not tested solution:
Make a bit-by-bit copy of your 250g drive to the 500g then try online -e on the drive.

[ms49434]

There's a clever way to replace a single drive within a stripe of disks.

First thing you should do is to release the spare drive, it is of no use for you because your pool isn't redundant.
Second thing is to enable autoexpand on your pool.

The trick:
For ZFS the pool is made of 3 virtual devices with 1 drive per virtual device.
Now that we know that there are 3 virtual devices we can attach a mirror device to the virtual device containing the 250MB drive.
Once resilvering is completed you just simply detach the 250MB drive from the virtual device.

All of the above can be achieved using the tools menu under Disks > ZFS > Pools > Tools, "Attach a data device" and "Detach a data device from a mirror".

The fourth drive will go into a new virtual device which is added to the pool using tools command "Add a virtual device to a pool".

Once done you should sync the WebGUI.

Good luck!

[alphasi1]

Thank you both!

I'm not sure how to enable auto-expand - can I do that from the UI or is it a command?

I released the spare and attached a data device. Resilvering is taking place; once complete I will remove the 250GB from the virtual device and add the 4th drive as you instruct.

Can I enable auto-expand at some point next, or did I need to do it before anything else?

Thank you again.

Code: Select all

  pool: share
 state: ONLINE
status: One or more devices is currently being resilvered.  The pool will
	continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Sat Jan 27 09:22:13 2018
        50.9G scanned out of 881G at 316M/s, 0h44m to go
        15.1G resilvered, 5.78% done
config:

	NAME        STATE     READ WRITE CKSUM
	share       ONLINE       0     0     0
	  ada0      ONLINE       0     0     0
	  ada1      ONLINE       0     0     0
	  mirror-2  ONLINE       0     0     0
	    ada2    ONLINE       0     0     0
	    ada3    ONLINE       0     0     0  (resilvering)

errors: No known data errors

[ms49434]

After you finished all tasks it is time to review your storage capacity of your pool and the autoexpand setting:

you can review the autoexpand setting of your pool with the following cli command:

Code: Select all

zpool get autoexpand share

you can enable autoexpand by submitting

Code: Select all

zpool set autoexpand=on share

you can disable autoexpand by submitting

Code: Select all

zpool set autoexpand=off share

[alphasi1]

Fantastic, thank you. The 250GB drive is replaced OK.

I can't see how to get the 4th drive into a new virtual device. It's listed as unknown/unformatted in HDD Management. When I look at format it's not available to select.

This is the current info:

Code: Select all

 pool: share
 state: ONLINE
  scan: resilvered 230G in 0h44m with 0 errors on Sat Jan 27 10:07:10 2018
config:

	NAME        STATE     READ WRITE CKSUM
	share       ONLINE       0     0     0
	  ada0      ONLINE       0     0     0
	  ada1      ONLINE       0     0     0
	  ada3      ONLINE       0     0     0

errors: No known data errors

It doesn't show up in Configuration > Current or Detected, even after running Synchronise.

Am I missing a step?

Thanks again.

[alphasi1]

Update - found the + under Pools > Virtual Device.

I can't seem to add it as a disk. The options are Stripe, Hot Spare, Cache or Log.

[ms49434]

once you added the disk drive to your system and once you formatted the new drive you can create a new virtual device with option "stripe".

[alphasi1]

Worked perfectly. Thanks again! How do I label the thread as solved?

Code: Select all

  pool: share
 state: ONLINE
  scan: resilvered 230G in 0h44m with 0 errors on Sat Jan 27 10:07:10 2018
config:

	NAME        STATE     READ WRITE CKSUM
	share       ONLINE       0     0     0
	  ada0      ONLINE       0     0     0
	  ada1      ONLINE       0     0     0
	  ada3      ONLINE       0     0     0
	  ada2      ONLINE       0     0     0

errors: No known data errors