On 04/02/2016 04:48 PM, Gabriele Bulfon wrote:
> I don't have labelclear on illumos, not my version at least...

Sorry, I wasn't aware that labelclear didn't made it into Illumos yet.

> But I read that "
> zpool create -f tank $disk & zpool destroy tank" may do the trick?
> https://www.illumos.org/issues/1789

Yes, neat idea. This overwrites the labels on the vdev, so a subsequent
zpool replace -f should work.

Another way would be to seek near the end of <device>

# dd if=/dev/zero of=<device> -bs=1M count=1
# dd if=/dev/zero of=<device> -bs=1G seek=999 (you get the idea)

> I'll check the zpool.cache too : is it safe to be removed anytime?

No, this is meant as a last resort. It will break at least zdb.

In case you deleted it,

# zpool set cachefile=/etc/zfs/zpool.cache <pool>

recreates the cache file.

HTH

Attila

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> Da: Attila Fülöp
> A: [email protected]
> Data: 1 aprile 2016 22.48.57 CEST
> Oggetto: Re: [discuss] converting adpatec volume to jbod cannot replace
> On 04/01/2016 06:44 PM, Gabriele Bulfon wrote:
> The proptotype machine is safe, I can play with it as much as I like, until I 
> find a good solution for the target machine.
> I did the "dd if=/dev/zero of=/dev/....", did the fdisk remove/create 
> partition...no way :(
> Only if I change the disk phisically in between the volume2jbod, the it will 
> work.
> How can this be? Any other way to let it think it's another disk and forget 
> about the replacing one?
> ZFS labels are quite "sticky". IRC each vdev has 4 labels, two at the
> start and two at the end. The easiest way to clear them is:
> # zpool labelclear
> Be sure to clear the labels on the unused device only.
> And maybe a
> # rm /etc/zfs/zpool.cache
> would also help.
> Attila
> 


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