[Sheepdog] Databases, write barriers etc

Brian Candler B.Candler at pobox.com
Mon Aug 8 17:44:58 CEST 2011

I am considering using a Sheepdog-based KVM cluster to run a Postgres
database, where data consistency is important.

Are there any problems or issues I should consider in this application? Does
Sheepdog support write barriers?  Should I use ext4 with journal

I notice the design doc says "The write request is successful only when all
replicas can be successfully updated", so I guess fsync shouldn't return
until all data has been written. But I'd be grateful for any real-world
experiences with databases on KVM+Sheepdog.



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