Important question, what is the interconnect? iSCSI? FC? NFS?
 -- richard

On Jul 24, 2012, at 9:44 AM, wrote:

> Working on a POC for high IO workloads, and I’m running in to a bottleneck 
> that I’m not sure I can solve.  Testbed looks like this :
> SuperMicro 6026-6RFT+ barebones w/ dual 5506 CPU’s, 72GB RAM, and ESXi
> VM – 4GB RAM, 1vCPU
> Connectivity dual 10Gbit Ethernet to Cisco Nexus 5010
> Target Nexenta system :
> Intel barebones, Dual Xeon 5620 CPU’s, 192GB RAM, Nexenta 3.1.3 Enterprise
> Intel x520 dual port 10Gbit Ethernet – LACP Active VPC to Nexus 5010 switches.
> 2x LSI 9201-16E HBA’s, 1x LSI 9200-8e HBA
> 5 DAE’s (3 in use for this test)
> 1 DAE – connected (multipathed) to LSI 9200-8e.  Loaded w/ 6x Stec ZeusRAM 
> SSD’s – striped for ZIL, and 6x OCZ Talos C 230GB drives for L2ARC.
> 2 DAE’s connected (multipathed) to one LSI 9201-16E – 24x 600GB 15k Seagate 
> Cheetah drives
> Obviously data integrity is not guaranteed
> Testing using IOMeter from windows guest, 10GB test file, queue depth of 64
> I have a share set up with 4k recordsizes, compression disabled, access time 
> disabled, and am seeing performance as follows :
> ~50,000 IOPS 4k random read.  200MB/sec, 30% CPU utilization on Nexenta, ~90% 
> utilization on guest OS.  I’m guessing guest OS is bottlenecking.  Going to 
> try physical hardware next week
> ~25,000 IOPS 4k random write.  100MB/sec, ~70% CPU utilization on Nexenta, 
> ~45% CPU utilization on guest OS.  Feels like Nexenta CPU is bottleneck. Load 
> average of 2.5
> A quick test with 128k recordsizes and 128k IO looked to be 400MB/sec 
> performance, can’t remember CPU utilization on either side. Will retest and 
> report those numbers.
> It feels like something is adding more overhead here than I would expect on 
> the 4k recordsizes/IO workloads.  Any thoughts where I should start on this?  
> I’d really like to see closer to 10Gbit performance here, but it seems like 
> the hardware isn’t able to cope with it?

Theoretical peak performance for a single 10GbE wire is near 300k IOPS @ 4KB, 
This workload is extraordinarily difficult to achieve with a single client 
using any of the popular
storage protocols.
 -- richard

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