Re: [ovirt-users] storage redundancy in Ovirt

On Sun, Apr 16, 2017 at 11:13 PM, Konstantin Raskoshnyi < konrasko(a)gmail.com&gt; 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 <dyasny(a)gmail.com&gt; wrote: > >> On Sun, Apr 16, 2017 at 7:29 AM, Nir Soffer <nsoffer(a)redhat.com&gt; wrote: >> >>> On Sun, Apr 16, 2017 at 2:05 PM Dan Yasny <dyasny(a)redhat.com&gt; wrote: >>> >>>> >>>> >>>> On Apr 16, 2017 7:01 AM, "Nir Soffer" <nsoffer(a)redhat.com&gt; wrote: >>>> >>>> On Sun, Apr 16, 2017 at 4:17 AM Dan Yasny <dyasny(a)gmail.com&gt; 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 < >>>>> konrasko(a)gmail.com&gt; 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 < >>>>>> fernando.frediani(a)upx.com&gt; 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 < >>>>>>> konrasko(a)gmail.com&gt;: >>>>>>> >>>>>>>> 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 < >>>>>>>> fernando.frediani(a)upx.com&gt; 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 < >>>>>>>>> konrasko(a)gmail.com&gt;: >>>>>>>>> >>>>>>>>>> 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 >>>>>>>>>> Users(a)ovirt.org >>>>>>>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>>>>>>> >>>>>>>>>> >>>>>>> >>>>>> _______________________________________________ >>>>>> Users mailing list >>>>>> Users(a)ovirt.org >>>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>>> >>>>>> >>>>> _______________________________________________ >>>>> Users mailing list >>>>> Users(a)ovirt.org >>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>> >>>> >>>> _______________________________________________ >>>> Users mailing list >>>> Users(a)ovirt.org >>>> http://lists.ovirt.org/mailman/listinfo/users >>>> >>>> >>>>