On 19/11/15 14:49, Krutika Dhananjay wrote:
I wanted to ask you one more thing: specifically in VM workload with
sharding, do you run into consistency issues with
strict-write-ordering being off?
I remember suggesting that this option be enabled. But that was for
plain dd on the mountpoint (and not inside the vm), where it was
necessary.
I want to know if it is *really* necessary in VM workloads.
Hi Krutika, sorry for the delay, have been head down with work and sick
doggies :(
No I didn't need strict-write-ordering off/on, the VM's were fine. It
was only stat-prefetch that needed to be off.
One caveat - I started testing with 3.7.5, then upgraded to 3.7.6, but
didn't upgrade the op-version (always forget that).
Once I set the op version to 3.7.6 sharded volumes started reporting
correct file sizes (for new files) even with strict-write-ordering off.
However disk usage was still out by a lot.
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