On 03/30/2015 03:01 PM, Garg, Pankaj wrote:
Hi,
I’m benchmarking my small cluster with HDDs vs HDDs with SSD Journaling.
I am using both RADOS bench and Block device (using fio) for testing.
I am seeing significant Write performance improvements, as expected. I
am however seeing the Reads coming out a bit slower on the SSD
Journaling side. They are not terribly different, but sometimes 10% slower.
Is that something other folks have also seen, or do I need some settings
to be tuned properly? I’m wondering if accessing 2 drives for reads,
adds latency and hence the throughput suffers.
Hi,
What kind of reads are you seeing the degradation with? Is it
consistent with different sizes and random/seq? Any interesting spikes
or valleys during the tests?
Thanks
Pankaj
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