A Fault Tolerant Virtualization Server Based on Xen Jrgen Gro - PowerPoint PPT Presentation

Oct 21, 2022 •185 likes •421 views

A Fault Tolerant Virtualization Server Based on Xen Jrgen Gro Virtualization Kernel Developer SUSE Linux GmbH, jgross@suse.com Status Quo Standard Xen Virtualization Server dom0 HVM pv Net- Block- xenstore qemu backend backend

A Fault Tolerant Virtualization Server Based on Xen Jürgen Groß Virtualization Kernel Developer SUSE Linux GmbH, jgross@suse.com
Status Quo
Standard Xen Virtualization Server dom0 HVM pv Net- Block- xenstore qemu backend backend Hypervisor SAN LAN 3
Single Points of Failure in Xen Server • Hypervisor • Dom0 • Xenstore • pv-Backends • LAN/SAN peripherals in case of single path 4
Standard Xen Virtualization Server dom0 HVM pv Net- Block- xenstore qemu backend backend Hypervisor SAN LAN 5
Kinds of Failures • Software errors (crashes, hangups) • Fatal Hardware errors • Non-fatal Hardware errors triggering software errors • Planned downtimes due to software updates • Planned downtimes due to hardware maintenance 6
Eliminating Single Points of Failure
Xen Server Today dom0 HVM pv Net- Block- xenstore qemu backend backend Hypervisor SAN LAN 8
Use Multipathing • LAN and SAN resources still accessible in case of path failure • Dom0 does multipathing for domUs 9
Use Multipathing dom0 HVM pv Net- Block- xenstore qemu backend backend Hypervisor SAN LAN 10
Move Xenstore Into Own Domain • Mandatory step for eliminating dom0 being single point of failure • Xenstore is still single point of failure, but dom0 high load won't slow it down any more 11
Move Xenstore Into Own Domain dom0 xenstore HVM pv Net- Block- qemu backend backend Hypervisor SAN LAN 12
Create Driver Domains • LAN ‒ One per interface card ‒ Multipathing done in guests ‒ Net-backend no longer single point of failure ‒ Driver domain can act as a managed switch • Block ‒ Multipathing still done in backend ‒ Further decoupling from dom0 13
Create Driver Domains LAN: one per interface adapter dom0 Net- Net- Block- xenstore HVM pv back back back qemu Hypervisor SAN LAN 14
Introduce pv-SAN Backend • Now one driver domain per interface card • Multipathing done in guests • Block-backend no longer a single point of failure • In case of SAN topology aware guests PCI- passthrough of FC-cards to guest no longer necessary • Driver domain acts as a SAN switch 15
Introduce pv-SAN Backend one per interface adapter dom0 Net- Net- SAN- SAN- xenstore HVM pv back back back back qemu Hypervisor SAN LAN 16
Use Stub Domains for HVM domUs dom0 Net- Net- SAN- SAN- xenstore stub HVM pv back back back back qemu Hypervisor SAN LAN 17
Make dom0 Restartable dom0 Net- Net- SAN- SAN- xenstore stub HVM pv back back back back qemu Hypervisor SAN LAN 18
How to Reach This Goal?
TODO: Verification, Configuration • Xenstore domain • LAN driver domain • Block driver domain • Stub domains for HVM 20
TODO: Implementation • Dom0 restart • SAN pv backend • Tooling for automatic creation of driver domains for each interface card • Tooling for automatic restart of crashed infrastructure domains (dom0, driver domains) • Support for software updates of infrastructure domains • Support for hotplug of interface cards • Support for live migration 21
Who is interested? SUSE: ✔ Thank you. 22
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