Thank you very much! It helped.
On Tue, Aug 19, 2014 at 12:43 AM, John Dickinson <m...@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.l...@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:m...@not.mn] > > Sent: Monday, August 18, 2014 11:54 AM > > To: Jyoti Ranjan > > Cc: openstack@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 <jran...@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 > >> _______________________________________________ > >> Mailing list: > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > >> Post to : openstack@lists.openstack.org > >> Unsubscribe : > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > > > >
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