On Tue, 2005-08-30 at 02:00 +0000, nattapon viroonsri wrote: > >On Mon, 2005-08-29 at 02:26 +0000, nattapon viroonsri wrote: > > > I use RedHat cluster v4 for HA and have no power switch hardware > > > When i disconnected network cable for client access resource , Failover > > > have occur as expect > > > But the server that was disconnect network cable not be rebooted or > >fenced > > > like rhcs V3(even no power switch). And the failed server can't not > >join > > > cluster again. > > > >Eep, no failover should have occurred if you don't have fencing. > > I see resource(virtual ip, serviice) tranfer to another node. but dont see > any mesage in /var/log/message said about fencing, may be i miss something . > and i try to reboot failnode with command "init 6" manually but it show that > cant stop rgmanager service. Interesting... the event that the node has died, failover shouldn't occur until the user-level service group recovers. The user-level service groups should not recover until *after* fencing recovers and completes. Without fencing, there should never be a failover (because fencing *fails* unlike in RHCS3, where it just complained and continued), unless something's been done that I'm not aware of? > > > So, Have anyway to reboot failed node(network problem or server problem) > > > without use hardware power switch to make failnode to clean state again > >? > > > >You need fencing hardware with RHCS4/RHEL4. I'd check ebay if you're > >not looking to spend a lot, you can get a WTI NPS115 for pretty cheap > >nowadays (under $100!). > > > Have any addition module or modify version of perl script "fence_xxx" or > use wathdog with rhcs v4. ? We are looking in to using them as an additional means, though I doubt we'll allow reliance on them like we did in RHEL2.1. That is, I suspect that there won't be a "fence_watchdog" driver, but you never know... On RHCS3, they were used as an additional means of protection, but the cluster software complained about lack of "STONITH devices" when only using the watchdog... I will state this plainly: Fencing hardware is *required* for RHCS4 (the Red Hat product/support offering). > >You can run with manual fencing, but no automatic recovery will occur, > >and this isn't a supported solution. > > > > Thanks for your suggestion. :) To clarify - my suggestion was to get a supported fence device, and I noted one which could be had cheaply. Personally, I recommend against using manual fencing for anything, including evaluation testing. You can also use GNBD + fence_gnbd -- no fencing hardware required! :) -- Lon -- Linux-cluster@xxxxxxxxxx http://www.redhat.com/mailman/listinfo/linux-cluster
