[mirror-admin] is push-sync available?

[Brian Long]

On Mon, 2008-03-17 at 16:23 -0500, Matt Domsch wrote:
> On Mon, Mar 17, 2008 at 01:43:02PM -0300, Carlos Carvalho wrote:
> > Is there a push-sync method for the masters to trigger the tier-1
> > mirrors? That'd be useful to avoid updates during changes in the
> > masters. It'd also make sure mirrors are notified as soon as there are
> > changes to be mirrored.
> 
> not at present.  While we know when release-engineering pushes bits
> onto one NetApp in Phoenix, we don't know for sure when those bits have landed on
> the other two NetApps in Tampa and Raleigh.  The NetApps use
> "snapmirror" to do the mirroring.  If anyone knows how to do this
> deterministically, then we can see about a push-sync.

Matt,

It's been a few years since I used snapmirror on NetApps, but I'm pretty
sure you can programmatically track the snapmirror process using "snap
list <volume>".  Assuming you had a host which had .rhosts or SSH access
to the filers in question, you could write a fairly simple shell script
to query the "master" Netapp for the snapmirror status.  Once all 3
copies are in sync, a push-sync could be initiated to tier 1.

/Brian/
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       Brian Long                             |       |
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