remove a disk (usb drive) from a zpool

[short-stack]

I was playing around last night, and was going to add a USB drive as a cache disk on my zpool volume, and was more sleepy than I should have been. I ended up dropping the USB disk in the main Volume instead of the cache, and clicked save without double checking.

Is the only way to remove this disk from the pool to copy the data to a different volume, and blow the zpool away and create a new one?

Code:

	NAME											STATE	 READ WRITE CKSUM
	Volume1										 ONLINE	   0	 0	 0
	  raidz1-0									  ONLINE	   0	 0	 0
		gptid/e335cafb-cc2d-11e5-afad-2c56dcd595a6  ONLINE	   0	 0	 0
		gptid/e42e9e77-cc2d-11e5-afad-2c56dcd595a6  ONLINE	   0	 0	 0
		gptid/e522612f-cc2d-11e5-afad-2c56dcd595a6  ONLINE	   0	 0	 0
		gptid/e614e0c9-cc2d-11e5-afad-2c56dcd595a6  ONLINE	   0	 0	 0
	  gptid/57582216-1572-11e7-87c2-001517d6681e	ONLINE	   0	 0	 0

Code:

root@nas] ~# zpool remove Volume1 gptid/57582216-1572-11e7-87c2-001517d6681e
cannot remove gptid/57582216-1572-11e7-87c2-001517d6681e: only inactive hot spares, cache, top-level, or log devices can be removed
[root@nas] ~# zpool detach Volume1 gptid/57582216-1572-11e7-87c2-001517d6681e
cannot detach gptid/57582216-1572-11e7-87c2-001517d6681e: only applicable to mirror and replacing vdevs

 

[gpsguy]

Yes, that is correct.

BTW, a cache drive (especially USB) would probably make your system perform worse, than not using one at all.

Is the only way to remove this disk from the pool to copy the data to a different volume, and blow the zpool away and create a new one?