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
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