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Thank you very much! It helped.


On Tue, Aug 19, 2014 at 12:43 AM, John Dickinson <me at not.mn> wrote:

> Yes, that's true. If Swift can't find the primary location for data on a
> write, it will put the data on a handoff node. Later, when the primary is
> available (or in this case, the IP is updated in the ring), the data will
> be moved back. To be explicit, this is new data put during the window
> between the change in IP and the ring update.
>
> This window is another reason dynamic IPs are much harder to use in a
> Swift cluster.
>
> --John
>
>
>
>
>
> On Aug 18, 2014, at 12:10 PM, Luse, Paul E <paul.e.luse at intel.com> wrote:
>
> > Don't you also have the issue of having those nodes unavailable during
> the time when their IP changes and someone gets around to updating and
> re-propagating those rings right?  Depending on the size of that window and
> how much traffic is going on at the time you may very well end up with a
> lot of extra data movement as incoming data makes it to handoffs (assuming
> their  addresses didn't change) and then back again after the rings reflect
> the new addresses of the primary(ies).
> >
> > -Paul
> >
> > -----Original Message-----
> > From: John Dickinson [mailto:me at not.mn]
> > Sent: Monday, August 18, 2014 11:54 AM
> > To: Jyoti Ranjan
> > Cc: openstack at lists.openstack.org
> > Subject: Re: [Openstack] [Swift] IP address of Swift nodes : need help
> >
> > If the IP for a storage node changes, you'll need to update the rings
> where that server's drives are. You can update the IP with the
> `swift-ring-builder set_info ...` command and then use "write_ring" to
> serialize it. Doing this will not cause any data movement in the cluster.
> Removing the server and re-adding it to the ring will cause data movement.
> >
> > So, no, it's not strictly necessary to use static IPs. You'll be saving
> yourself some management overhead if you do, though.
> >
> > --John
> >
> >
> >
> >
> > On Aug 18, 2014, at 11:42 AM, Jyoti Ranjan <jranjan at gmail.com> wrote:
> >
> >> Hi,
> >>
> >> We are deploying Swift clusters where we do have IP addresses assigned
> to Swift nodes via DHCP. Curious to know, what will happen if IP address of
> a give node change that node is made part of Swift cluster. For e.g. let us
> assume that Swift object node got IP 192.168.10.2 and later it changes to
> 192.168.10.9 because of DHCP. Will running Swift cluster get affected?
> >>
> >> In other words, is it necessary to use static IP for Swift nodes?
> >>
> >>
> >> Regards,
> >> Jyoti Ranjan
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>
>
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