Hi,
I wondering how safe it is to use rbd cache = truewith libvirt/qemu.
I did read the documentation and it says "When the OS sends a barrier
or a flush request, all dirty data is written to the OSDs. This means
that using write-back caching is just as safe as using a well-behaved
physical hard disk with a VM that properly sends flushes"
but what does it really means.. "just as safe as physical hard drives" I
don't know how safe are physical hard drives.. Is it safe to enable that
setting on a prod environment ? If I don't enable that cache I'm just
getting really poor write performance on the VMs.
What are the implications of enabling the caching when using
libvirt/qemu/kvm ?
Thanks
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