ZFS: How can I stop a zpool replace that's currently in progress?

Question

A few days ago, I noticed that the ZFS pool on my home server had started reslivering a disk by itself but was no longer making any progress. The disk had some SMART errors (but did not consider itself failed), so I decided to replace it with a spare. I did that, but my spare disk is now generating a large number of DMA_WRITE errors, and the reslivering from the replace is restarting once it gets to 10% or so.

I now want to temporarily replace both the original disk and the spare disk with a USB disk. I've stopped the resliver with "zpool scrub -s tank". However, both the disks are still listed as "replacing" and won't allow another replace, and I can't seem to get them out of that state.

How can I stop/cancel a zpool replace before it's completed?

I am using FreeBSD 8.1-RELEASE with a 5-disk RAIDZ array.

Answer 1

According the docs:

An in-progress spare replacement can be cancelled by detaching the hot spare.

It sounds like you did a manual replace but detching the new disk might work the same.