* Re: [ceph-users] Ceph mon quorum [not found] ` <515F0E08.8010301@bmrb.wisc.edu> @ 2013-04-05 17:50 ` Gregory Farnum 2013-04-05 17:53 ` Dimitri Maziuk 0 siblings, 1 reply; 2+ messages in thread From: Gregory Farnum @ 2013-04-05 17:50 UTC (permalink / raw) To: Dimitri Maziuk; +Cc: ceph-devel@vger.kernel.org On Fri, Apr 5, 2013 at 10:46 AM, Dimitri Maziuk <dmaziuk@bmrb.wisc.edu> wrote: > On 04/05/2013 12:32 PM, Gregory Farnum wrote: > ... >> Or just a VM running somewhere that's got a VPN connection to your >> room-based monitors, yes. Ceph is a strongly consistent system and >> you're not going to get split brains, period. This is the price you >> pay for that. > > Yeah, well. You are in building A talking to the servers in room A. The > building catches fire, you run over to building B and connect to the > servers in room B. Unfortunately your uplink was in A's basement, it is > now powered off and flooded, and so mon.b has no connection to > mon.in.the.cloud and your data is unreachable. > > Which means both building B and mon.in.the.cloud were a total waste of > your time and money. Obviously you would need them each to have their own independent connection, yes. I'm sorry if this aspect of the system is problematic for you, but it's pretty fundamental to any distributed or cloudy system that chooses consistency over availability. -Greg Software Engineer #42 @ http://inktank.com | http://ceph.com ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [ceph-users] Ceph mon quorum 2013-04-05 17:50 ` [ceph-users] Ceph mon quorum Gregory Farnum @ 2013-04-05 17:53 ` Dimitri Maziuk 0 siblings, 0 replies; 2+ messages in thread From: Dimitri Maziuk @ 2013-04-05 17:53 UTC (permalink / raw) To: Gregory Farnum; +Cc: ceph-devel@vger.kernel.org [-- Attachment #1: Type: text/plain, Size: 483 bytes --] On 04/05/2013 12:50 PM, Gregory Farnum wrote: ... I'm sorry if this aspect of the system is problematic > for you, but it's pretty fundamental to any distributed or cloudy > system that chooses consistency over availability. It isn't actually -- as long as 'chooses consistency over availability' is printed in big bold letters on the front page of the sales brochure. ;) -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 255 bytes --] ^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-04-05 17:50 ` [ceph-users] Ceph mon quorum Gregory Farnum
2013-04-05 17:53 ` Dimitri Maziuk
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