On 29.03.2018 13:50, Peter Linder wrote: > Den 2018-03-29 kl. 12:29, skrev David Rabel: >> On 29.03.2018 12:25, Janne Johansson wrote: >>> 2018-03-29 11:50 GMT+02:00 David Rabel <rabel@xxxxxxxxxxxxx>: >>>> You are right. But with my above example: If I have min_size 2 and size >>>> 4, and because of a network issue the 4 OSDs are split into 2 and 2, is >>>> it possible that I have write operations on both sides and therefore >>>> have inconsistent data? >>>> >>> You always write to the primary, which in turn sends copies to the 3 >>> others, >>> so in the 2+2 split case, only one side can talk to the primary OSD for >>> that pg, >>> so writes will just happen on one side at most. > I'm not sure that this is true, will not the side that doesn't have the > primary simply elect a new one when min_size=2 and there are 2 of > [failure domain] available? This is assuming that there are enough mon's > also. > > Even if this is the case, only half of the PGs would be available and > operations will stop. Why is this? If min_size is 2 and 2 PGs are available, operations should not stop. Or am I wrong here? David -- David Rabel Linux Consultant & Trainer Tel.: +49-1511-5908566 Mail: rabel@xxxxxxxxxxxxx B1 Systems GmbH Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537
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