On Mar 16, 2012, at 3:06 PM, Brandon High wrote:

> On Fri, Mar 16, 2012 at 2:35 PM, Philip Brown <p...@bolthole.com> wrote:
>> if there isnt a process visible doing this via ps, I'm wondering how
>> one might check if a zfs filesystem or snapshot is rendered "busy" in
>> this way, interfering with an unmount or destroy?
>> I'm also wondering if this sort of thing can mean interference between
>> some combination of multiple send/receives at the same time, on the
>> same filesystem?
> Look at 'zfs hold', 'zfs holds', and 'zfs release'. Sends and receives
> will place holds on snapshots to prevent them from being changed.

For most cases, without other breakage, there is a process on each end:
one running zfs send, the other running zfs receive.
 -- richard

DTrace Conference, April 3, 2012, 
ZFS Performance and Training

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