On 08/02/2013 06:21 PM, DJ Delorie wrote:
Mbps is not directly relates to IOPS ultimately you could have
16gbps fcp interface but if the storage attached to that is slow
without decent caching etc the performance will still be terrible
The same disk was used for all the usb tests, and had way more
mbytes/sec over eSATA.
The iSCSI tests were done with a ramdisk.
You are missing the point, which was to question whether the real
workload you are applying is sensitive to MB/s rather than IOPS as most
workloads are. A 7200 rpm disk performing 4KB random operations will top
out at under 120 IOPS, which is 480KB/s. If that is what your workload
does, it doesn't matter whether the inrerface can do 20MB/s, 30MB/s or
300MB/s, you will still in reality be limited to 480KB/s.
Gordan
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