Re: [Users] [vdsm] Migration failed (previous migrations succeded)

On Mon, Feb 3, 2014 at 1:43 PM, Michal Skrivanek <michal.skrivanek(a)redhat.com&gt; wrote: > > On Feb 1, 2014, at 18:25 , Itamar Heim <iheim(a)redhat.com&gt; wrote: > >> On 01/31/2014 09:30 AM, Sven Kieske wrote: >>> Hi, >>> >>> is there any documentation regarding all >>> allowed settings in the vdsm.conf? >>> >>> I didn't find anything related in the rhev docs >> >> that's a question for vdsm mailing list - cc-ing… > > the vdsm.conf has a description for each parameter…just search for all containing "migration":) > we do want to expose some/most/all of them in UI/REST eventually, the "migration downtime" setting is there now in 3.4, but others are missing > > Thanks, > michal >> >>> >>> Am 30.01.2014 21:43, schrieb Itamar Heim: >>>> On 01/30/2014 10:37 PM, Markus Stockhausen wrote: >>>>>>> Von: Itamar Heim [iheim(a)redhat.com] >>>>>>> Gesendet: Donnerstag, 30. Januar 2014 21:25 >>>>>>> An: Markus Stockhausen; ovirt-users >>>>>>> Betreff: Re: [Users] Migration failed (previous migrations succeded) >>>>>>> >>>>>>> >>>>>>> Now I' getting serious problems. During the migration the VM was >>>>>>> doing a rather slow download at 1,5 MB/s. So the memory changed >>>>>>> by 15 MB per 10 seconds. No wonder that a check every 10 seconds >>>>>>> was not able to see any progress. Im scared what will happen if I >>>>>>> want to migrate a medium loaded system runing a database. >>>>>>> >>>>>>> Any tip for a parametrization? >>>>>>> >>>>>>> Markus >>>>>>> >>>>>> >>>>>> what's the bandwidth? default is up to 30MB/sec, to allow up to 3 VMs to >>>>>> migrate on 1Gb without congesting it. >>>>>> you could raise that if you have 10GB, or raise the bandwidth cap and >>>>>> reduce max number of concurrent VMs, etc. >>>>> >>>>> My migration network is IPoIB 10GBit. During our tests only one VM >>>>> was migrated. Bandwidth cap or number of concurrent VMs has not >>>>> been changed after default install. >>>>> >>>>> Is migration_max_bandwidth in /etc/vdsm/vdsm.conf still the right place? >>>> >>>> probably >>>> >>>>> And what settings do you suggest? >>>> Not tried myself the change of values, but in a previous thread (actually for limiting and not speeding up migration ;-) these two parameters were described and to be put in each /etc/vdsm/vdsm.conf

max_outgoing_migrations (eg 1 for allowing only one migration at a time) migration_max_bandwidth (unit is in MBytes/s, vdsm default is 32MiBps and it is for single migration, not overall) I think it is necessary to follow this workflow for every host

- put host into maintenance - stop vdsmd service - change values - start vdsmd service - activate host

Gianluca