On 11/05/2012 06:53 AM, Stefan Priebe - Profihost AG wrote:
Hello list,
right now i'm testing rbd block devices with kvm using Default cache (no
cache).
Is there any recommanded value for RBD? (i don't wanna loose data)
It acts like a well-behaved disk cache (i.e. it respects
flushes/barriers from the guest), so it's no more likely to cause data
loss than a local hard disk in the event of an unexpected shutdown.
I recommend running it in writeback mode (the default when rbd cache =
true). The best cache size will depend on your workload and hardware.
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