Notably, the tiebreaker should be in a third location. > On Feb 14, 2024, at 05:16, Peter Sabaini <peter@xxxxxxxxxx> wrote: > > On 14.02.24 06:59, Vladimir Sigunov wrote: >> Hi Ronny, >> This is a good starting point for your design. >> https://docs.ceph.com/en/latest/rados/operations/stretch-mode/ >> >> My personal experience says that 2 DC Ceph deployment could suffer from a 'split brain' situation. If you have any chance to create a 3 DC configuration, I would suggest to consider it. It could be more expensive, but it definitely will be more reliable and fault tolerant. > > The docs you linked mention[0] a tiebreaker monitor (which could be a VM / in the cloud) -- have you used something like this? > > [0] https://docs.ceph.com/en/latest/rados/operations/stretch-mode/#limitations-of-stretch-mode > > cheers, > peter. > >> Sincerely, >> Vladimir >> >> Get Outlook for Android<https://aka.ms/AAb9ysg> >> ________________________________ >> From: ronny.lippold@xxxxxxxxx <ronny.lippold@xxxxxxxxx> >> Sent: Tuesday, February 13, 2024 6:50:50 AM >> To: ceph-users@xxxxxxx <ceph-users@xxxxxxx> >> Subject: concept of ceph and 2 datacenters >> >> hi there, >> i have a design/concept question, to see, whats outside and which kind >> of redundancy you use. >> >> actually, we use 2 ceph cluster with rbd-mirror to have an cold-standby >> clone. >> but, rbd mirror is not application consistend. so we cannot be sure, >> that all vms (kvm/proxy) are running. >> we also waste a lot of hardware. >> >> so now, we think about one big cluster over the two datacenters (two >> buildings). >> >> my queston is, do you care about ceph redundancy or is one ceph with >> backups enough for you? >> i know, with ceph, we are aware of hdd or server failure. but, are >> software failures a real scenario? >> >> would be great, to get some ideas from you. >> also about the bandwidth between the 2 datacenters. >> we are using 2x 6 proxmox server with 2x6x9 osd (sas ssd). >> >> thanks for help, my minds are rotating. >> >> kind regards, >> ronny >> >> >> -- >> Ronny Lippold >> System Administrator >> >> -- >> Spark 5 GmbH >> Rheinstr. 97 >> 64295 Darmstadt >> Germany >> -- >> Fon: +49-6151-8508-050 >> Fax: +49-6151-8508-111 >> Mail: ronny.lippold@xxxxxxxxx >> Web: https://www.spark5.de >> -- >> Geschäftsführer: Henning Munte, Michael Mylius >> Amtsgericht Darmstadt, HRB 7809 >> -- >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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