Fence agent under each node? On Sun, Apr 16, 2017 at 8:14 PM Dan Yasny <[email protected]> wrote:
> On Sun, Apr 16, 2017 at 11:13 PM, Konstantin Raskoshnyi < > [email protected]> wrote: > >> "Corner cases"? >> I tried to simulate crash of SPM server and ovirt kept trying to >> reistablished connection to the failed node. >> > > Did you configure fencing? > > >> >> >> On Sun, Apr 16, 2017 at 8:10 PM Dan Yasny <[email protected]> wrote: >> >>> On Sun, Apr 16, 2017 at 7:29 AM, Nir Soffer <[email protected]> wrote: >>> >>>> On Sun, Apr 16, 2017 at 2:05 PM Dan Yasny <[email protected]> wrote: >>>> >>>>> >>>>> >>>>> On Apr 16, 2017 7:01 AM, "Nir Soffer" <[email protected]> wrote: >>>>> >>>>> On Sun, Apr 16, 2017 at 4:17 AM Dan Yasny <[email protected]> wrote: >>>>> >>>>>> When you set up a storage domain, you need to specify a host to >>>>>> perform the initial storage operations, but once the SD is defined, it's >>>>>> details are in the engine database, and all the hosts get connected to it >>>>>> directly. If the first host you used to define the SD goes down, all >>>>>> other >>>>>> hosts will still remain connected and work. SPM is an HA service, and if >>>>>> the current SPM host goes down, SPM gets started on another host in the >>>>>> DC. >>>>>> In short, unless your actual NFS exporting host goes down, there is no >>>>>> outage. >>>>>> >>>>> >>>>> There is no storage outage, but if you shutdown the spm host, the spm >>>>> host >>>>> will not move to a new host until the spm host is online again, or you >>>>> confirm >>>>> manually that the spm host was rebooted. >>>>> >>>>> >>>>> In a properly configured setup the SBA should take care of that. >>>>> That's the whole point of HA services >>>>> >>>> >>>> In some cases like power loss or hardware failure, there is no way to >>>> start >>>> the spm host, and the system cannot recover automatically. >>>> >>> >>> There are always corner cases, no doubt. But in a normal situation. >>> where an SPM host goes down because of a hardware failure, it gets fenced, >>> other hosts contend for SPM and start it. No surprises there. >>> >>> >>>> >>>> Nir >>>> >>>> >>>>> >>>>> >>>>> Nir >>>>> >>>>> >>>>>> >>>>>> On Sat, Apr 15, 2017 at 1:53 PM, Konstantin Raskoshnyi < >>>>>> [email protected]> wrote: >>>>>> >>>>>>> Hi Fernando, >>>>>>> I see each host has direct connection nfs mount, but yes, if main >>>>>>> host to which I connected nfs storage going down the storage becomes >>>>>>> unavailable and all vms are down >>>>>>> >>>>>>> >>>>>>> On Sat, Apr 15, 2017 at 10:37 AM FERNANDO FREDIANI < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> Hello Konstantin. >>>>>>>> >>>>>>>> That doesn`t make much sense make a whole cluster depend on a >>>>>>>> single host. From what I know any host talk directly to NFS Storage >>>>>>>> Array >>>>>>>> or whatever other Shared Storage you have. >>>>>>>> Have you tested that host going down if that affects the other with >>>>>>>> the NFS mounted directlly in a NFS Storage array ? >>>>>>>> >>>>>>>> Fernando >>>>>>>> >>>>>>>> 2017-04-15 12:42 GMT-03:00 Konstantin Raskoshnyi < >>>>>>>> [email protected]>: >>>>>>>> >>>>>>>>> In ovirt you have to attach storage through specific host. >>>>>>>>> If host goes down storage is not available. >>>>>>>>> >>>>>>>>> On Sat, Apr 15, 2017 at 7:31 AM FERNANDO FREDIANI < >>>>>>>>> [email protected]> wrote: >>>>>>>>> >>>>>>>>>> Well, make it not go through host1 and dedicate a storage server >>>>>>>>>> for running NFS and make both hosts connect to it. >>>>>>>>>> In my view NFS is much easier to manage than any other type of >>>>>>>>>> storage, specially FC and iSCSI and performance is pretty much the >>>>>>>>>> same, so >>>>>>>>>> you won`t get better results other than management going to other >>>>>>>>>> type. >>>>>>>>>> >>>>>>>>>> Fernando >>>>>>>>>> >>>>>>>>>> 2017-04-15 5:25 GMT-03:00 Konstantin Raskoshnyi < >>>>>>>>>> [email protected]>: >>>>>>>>>> >>>>>>>>>>> Hi guys, >>>>>>>>>>> I have one nfs storage, >>>>>>>>>>> it's connected through host1. >>>>>>>>>>> host2 also has access to it, I can easily migrate vms between >>>>>>>>>>> them. >>>>>>>>>>> >>>>>>>>>>> The question is - if host1 is down - all infrastructure is down, >>>>>>>>>>> since all traffic goes through host1, >>>>>>>>>>> is there any way in oVirt to use redundant storage? >>>>>>>>>>> >>>>>>>>>>> Only glusterfs? >>>>>>>>>>> >>>>>>>>>>> Thanks >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> _______________________________________________ >>>>>>>>>>> Users mailing list >>>>>>>>>>> [email protected] >>>>>>>>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>>>>>>>> >>>>>>>>>>> >>>>>>>> >>>>>>> _______________________________________________ >>>>>>> Users mailing list >>>>>>> [email protected] >>>>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>>>> >>>>>>> >>>>>> _______________________________________________ >>>>>> Users mailing list >>>>>> [email protected] >>>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>>> >>>>> >>>>> _______________________________________________ >>>>> Users mailing list >>>>> [email protected] >>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>> >>>>> >>>>>
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