> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Dave Pooser
> Unfortunately I did not realize that zvols require disk space sufficient
> to duplicate the zvol, and my zpool wasn't big enough. After a false start
> (zpool add is dangerous when low on sleep) I added a 250GB mirror and a
> pair of 3GB mirrors to miniraid and was able to successfully snapshot the
> zvol: miniraid/RichRAID@exportable 

This doesn't make any sense to me.  The snapshot should not take up any 
(significant) space on the sending side.  It's only on the receiving side, 
trying to receive a snapshot, that you require space.  Because it won't clobber 
the existing zvol on the receiving side until the complete new zvol was 
received to clobber it with.

But simply creating the snapshot on the sending side should be no problem.

> The problem: so far the send/recv appears to have copied 6.25TB of 5.34TB.
> That... doesn't look right. 

I don't know why that happens, but sometimes it happens.  So far, I've always 
waited it out, and so far it's always succeeded for me.

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