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800Throughput (MB/min)7006005004003002001m20s2m35s13m55s19m36s17m20s15m10s16m40sFigure 3. Dell EqualLogic replicationthroughput and completion timeswith F5 BIG-IP WOM accelerationover a 45 Mbps WAN with 100 ms oflatency and 1 percent packet loss1000500 MB 1 GB 5 GB 10 GB 10 GB 10 GB 10 GB(1:1) (1:1) (1:1) (1:1) (2:1) (4:1) (4:1 withencryption)Volume size and data compressibilityEqualLogic iSCSI SAN replicationthroughput and completiontimes when using F5 BIG-IPWOM technology to accelerateand encrypt iSCSI traffic as itcrossed a WAN. The tests wereperformed in November 2009at the Dell Interoperability Lab inRound Rock, Texas.As shown in Figure 2, thelab configuration included twoEqualLogic PS6000XV iSCSISAN arrays with sixteen 420 GB,15,000 rpm Serial Attached SCSI(SAS) hard drives in a RAID-50configuration connected bytwo Dell PowerConnect6248 L3 switches. F5 BIG-IP3600 appliances with WOMtechnology were connectedto the switches at eachsimulated site. A WAN emulatorinterconnected the switches;the emulator functions includedlimiting bandwidth, injectinglatency, and dropping packetsto simulate two remote datacenters connected over a WAN.The two arrays then replicatedvolumes over the emulatedWAN, benefiting from WOMacceleration and encryption.The test team used the Webbrowser–based EqualLogicGroup Manager user interfaceto configure the volumes,manage the replication jobs,and report throughput andcompletion times. The testruns included asynchronousfull-volume replication jobs, withno incremental replications, andeach run was limited to singlevolumereplications.Similarly, the Webbrowser–based BIG-IPmanagement interface wasused for WOM configuration,including endpoints, virtualservers, encryption profiles, andacceleration profiles and routing,as well as an iSCSI accelerationpolicy. The performancedashboard was monitored toobserve WAN optimizationstatistics, network throughput,and processor and memoryutilization during the test runs.F5 BIG-IP WOMacceleration test resultsThe goal of WAN optimizationis to increase performance byminimizing latency—helping toincrease the perceived bandwidth,seamlessly recover from packetloss, and enable WANs to provideperformance characteristicssimilar to LANs. Figure 3 showsDell EqualLogic iSCSI replicationthroughput and completion timeswith F5 BIG-IP WOM accelerationover a 45 Mbps WAN with 100 msof latency and 1 percent packetloss (10,000 packets per million)across a variety of volume sizes.The WOM-accelerated tests for the10 GB volume additionally showthe throughput and completiontimes for 2:1 and 4:1 volume datacompressibility as well as 4:1compressibility with encryption.To put these results incontext, using WOM technologyenabled the WAN link at 45 Mbpswith 100 ms of latency and1 percent packet loss to provideresults roughly comparable towhat could be expected of a100 Mbps LAN with no latencyor packet loss, even whenusing encryption—helping makeremote replication of large datavolumes possible in a muchshorter period of time than itwould otherwise require. As anReprinted from Dell Power Solutions, 2010 Issue 2. Copyright © 2010 Dell Inc. All rights reserved.dell.com/powersolutions | 2010 Issue 02 73