On Friday, 10/04/2013 at 05:12 EDT, Marcy Cortes <[email protected]> wrote:
> I do plan to write up all the steps needed in a VM environment to get > OCFS2/CLVM/Storage Based fencing with minidisks. Maybe in the form of a SHARE > presentation. > It would be SUSE specific though, since that's what I have. In a home-built clustered single-writer shared storage HA environments (MDISKs or LUNs) that you're building on your own, each guest needs a minidisk on an XLINK-managed volume. If a guest comes up and doesn't have R/W access to, for example, the 666 disk, it doesn't bother booting Linux, but simply screams and logs off. Please note that this applies only within a data center as it relies on shared DASD among the z/VM systems. > With what I've learned this far, I wouldn't make it my generic solution. Then > again, we already have one. > I do think one of the requirements for any generic solution would be to have > the ability for operations / applications staff to route work to/from different > things. I would sure not want to be called to take a node out of service. It > would need to integrate in with existing authentication systems too. SUSE > does provide Hawk, which provides a web interface into 1 cluster, but I don't > think that would work the number of people that we have with various roles in > app cluster management and monitoring. Alerting is a pretty important thing to > have in your solution as well. If you can automate suspension of host monitors, you will be well served. That way, when you take down part of a cluster (e.g. z/VM IPL), the central host monitors don't start beeping. I say "suspend" rather than "disable" because if they aren't back online by the end of the service window, you WANT the alarms to kick in IF they see that the VM systems is up. (I say. No point in whinging about Linux guests not being up if the VM system is still down, wot?) Alan Altmark Senior Managing z/VM and Linux Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 [email protected] IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
