| Well, in a word, yes. You really expect a network replicated storage system in user space to be comparable to direct attached ssd storage? For what it's worth, I've got a pile of regular spinning rust, this is what my cluster will do inside a vm with rbd writeback caching on. As you can see, latency is everything. dd if=/dev/zero of=1g bs=1M count=1024 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 6.26289 s, 171 MB/s dd if=/dev/zero of=1g bs=1M count=1024 oflag=dsync 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 37.4144 s, 28.7 MB/s As you can see, latency is a killer. On Sep 18, 2013, at 3:23 PM, Jason Villalta <jason@xxxxxxxxxxxx> wrote:
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