On Mon, May 12, 2014 at 03:45:43PM +0200, Uwe Grohnwaldt wrote: > Hi, > > yes, we use it in production. I can stop/kill the tgt on one server and XenServer goes to the second one. We enabled multipathing in xenserver. In our setup we haven't multiple ip-ranges so we scan/login the second target on xenserverstartup with iscsiadm in rc.local. > > Thats based on history - we used Dell Equallogic before ceph came in and there was no need to use multipathing (only LACP-channels). No we enabled multipathing and use tgt, but without diffent ip-ranges. > I assume you connected the machines to the same switch ? As normal LACP don't work with multiple switches. Is that correct ? It wasn't that I needed different ip-ranges in my setup, it just makes it simpler/predictable. > Mit freundlichen Gr??en / Best Regards, > -- > Consultant > Dipl.-Inf. Uwe Grohnwaldt > Gutleutstr. 351 > 60327 Frankfurt a. M. > > eMail: uwe at grohnwaldt.eu > Telefon: +49-69-34878906 > Mobil: +49-172-3209285 > Fax: +49-69-348789069 > > ----- Original Message ----- > > From: "Andrei Mikhailovsky" <andrei at arhont.com> > > To: "Uwe Grohnwaldt" <uwe at grohnwaldt.eu> > > Cc: ceph-users at lists.ceph.com > > Sent: Montag, 12. Mai 2014 14:48:58 > > Subject: Re: Ceph with VMWare / XenServer > > > > > > Uwe, thanks for your quick reply. > > > > Do you run the Xenserver setup on production env and have you tried > > to test some failover scenarios to see if the xenserver guest vms > > are working during the failover of storage servers? > > > > Also, how did you set up the xenserver iscsi? Have you used the > > multipath option to set up the LUNs? > > > > Cheers > > > > > > > > > > ----- Original Message ----- > > > > From: "Uwe Grohnwaldt" <uwe at grohnwaldt.eu> > > To: ceph-users at lists.ceph.com > > Sent: Monday, 12 May, 2014 12:57:48 PM > > Subject: Re: Ceph with VMWare / XenServer > > > > Hi, > > > > at the moment we are using tgt with RBD backend compiled from source > > on Ubuntu 12.04 and 14.04 LTS. We have two machines within two > > ip-ranges (e.g. 192.168.1.0/24 and 192.168.2.0/24). One machine in > > 192.168.1.0/24 and one machine in 192.168.2.0/24. The config for tgt > > is the same on both machines, they export the same rbd. This works > > well for XenServer. > > > > For VMWare you have to disable VAAI to use it with tgt > > (http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033665) > > If you don't disable it, ESXi becomes very slow and unresponsive. > > > > I think the problem is the iSCSI Write Same Support but I haven't > > tried which of the settings of VAAI is responsible for this > > behavior. > > > > Mit freundlichen Gr??en / Best Regards, > > -- > > Consultant > > Dipl.-Inf. Uwe Grohnwaldt > > Gutleutstr. 351 > > 60327 Frankfurt a. M. > > > > eMail: uwe at grohnwaldt.eu > > Telefon: +49-69-34878906 > > Mobil: +49-172-3209285 > > Fax: +49-69-348789069 > > > > ----- Original Message ----- > > > From: "Andrei Mikhailovsky" <andrei at arhont.com> > > > To: ceph-users at lists.ceph.com > > > Sent: Montag, 12. Mai 2014 12:00:48 > > > Subject: Ceph with VMWare / XenServer > > > > > > > > > > > > Hello guys, > > > > > > I am currently running a ceph cluster for running vms with qemu + > > > rbd. It works pretty well and provides a good degree of failover. I > > > am able to run maintenance tasks on the ceph nodes without > > > interrupting vms IO. > > > > > > I would like to do the same with VMWare / XenServer hypervisors, > > > but > > > I am not really sure how to achieve this. Initially I thought of > > > using iscsi multipathing, however, as it turns out, multipathing is > > > more for load balancing and nic/switch failure. It does not allow > > > me > > > to perform maintenance on the iscsi target without interrupting > > > service to vms. > > > > > > Has anyone done either a PoC or better a production environment > > > where > > > they've used ceph as a backend storage with vmware / xenserver? The > > > important element for me is to have the ability of performing > > > maintenance tasks and resilience to failovers without interrupting > > > IO to vms. Are there any recommendations or howtos on how this > > > could > > > be achieved? > > > > > > Many thanks > > > > > > Andrei > > > > > > > > > _______________________________________________ > > > ceph-users mailing list > > > ceph-users at lists.ceph.com > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users at lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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