<p>Hello,</p><p>Thanks in advance for any consideration given to this question.</p><p>We have six servers that we are preparing to deploy as two Exchange 2010 clusters. We are running Jetstress and we are seeing that some
of the databases are performing worse than the others. In the most recent tests, the 'I/O Database Reads Average Latency ' was below 20ms for databases 1 to 32, but above 20ms for databases 33 to 40. </p><p>What I don't understand is, these database
are all on the same RAID10 volume being presented to Windows Server 2012. I cannot see why we should be seeing any significant performance variations between any of the databases as they are sharing the same volume but, as you can see below, there is significant
variation. The lowest is 13.2ms latency and the highest 27.8ms.</p><p>Can anyone provide an insight into why we should see a variation in the performance of databases stored on the same RAID volume and any thoughts on how we can improve performance?</p><fieldset><legend>Database
Sizing and Throughput</legend><table border="0" cellPadding="2" cellSpacing="0"><tbody><tr><td class="grid_row_header">Achieved Transactional I/O per Second</td><td>517.008</td></tr><tr><td
class="grid_row_header">Capacity Percentage</td><td>100%</td></tr><tr><td class="grid_row_header">Throughput Percentage</td><td>100%</td></tr><tr><td class="grid_row_header">Initial
Database Size (bytes)</td><td>24012346884096</td></tr><tr><td class="grid_row_header">Final Database Size (bytes)</td><td>24013017972736</td></tr><tr><td class="grid_row_header">Database
Files (Count)</td><td>40</td></tr></tbody></table></fieldset> <br /><fieldset style="width:900px;height:245px;"><legend>Jetstress System Parameters</legend><table border="0"
cellPadding="2" cellSpacing="0"><tbody><tr><td class="grid_row_header">Thread Count</td><td>2 (per database)</td></tr><tr><td class="grid_row_header">Minimum Database
Cache</td><td>1280.0 MB</td></tr><tr><td class="grid_row_header">Maximum Database Cache</td><td>10240.0 MB</td></tr><tr><td class="grid_row_header">Insert Operations</td><td>40%</td></tr><tr><td
class="grid_row_header">Delete Operations</td><td>20%</td></tr><tr><td class="grid_row_header">Replace Operations</td><td>5%</td></tr><tr><td class="grid_row_header">Read
Operations</td><td>35%</td></tr><tr><td class="grid_row_header">Lazy Commits</td><td>70%</td></tr><tr><td class="grid_row_header">Run Background Database Maintenance</td><td>True</td></tr><tr><td
class="grid_row_header">Number of Copies per Database</td><td>3</td></tr></tbody></table></fieldset><p></p>Transactional I/O Performance <table border="0" cellPadding="2"
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grid_cell_border ">4536.399</td></tr><tr><td class="grid_row_header grid_cell_border">Instance3948.33</td><td class="failure grid_cell_border ">20.017</td><td class=" grid_cell_border">0.840</td><td class=" grid_cell_border ">7.763</td><td class=" grid_cell_border ">4.489</td><td class=" grid_cell_border ">43454.115</td><td class=" grid_cell_border">38553.752</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">0.113</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border">5.309</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">4520.340</td></tr><tr class="grid_alternating_row"><td class="grid_row_header grid_cell_border">Instance3948.34</td><td
class="failure grid_cell_border ">20.943</td><td class=" grid_cell_border ">0.879</td><td class=" grid_cell_border ">7.747</td><td class=" grid_cell_border ">5.371</td><td
class=" grid_cell_border ">46997.276</td><td class=" grid_cell_border ">36928.814</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">0.126</td><td
class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">5.317</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">4536.049</td></tr><tr><td
class="grid_row_header grid_cell_border">Instance3948.35</td><td class="failure grid_cell_border ">21.450</td><td class=" grid_cell_border ">0.889</td><td class=" grid_cell_border ">7.984</td><td
class=" grid_cell_border ">4.960</td><td class=" grid_cell_border ">45732.749</td><td class=" grid_cell_border ">38092.653</td><td class=" grid_cell_border ">0.000</td><td
class=" grid_cell_border ">0.111</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">5.548</td><td class=" grid_cell_border ">0.000</td><td class="
grid_cell_border ">4795.407</td></tr><tr class="grid_alternating_row"><td class="grid_row_header grid_cell_border">Instance3948.36</td><td class="failure grid_cell_border ">22.044</td><td
class=" grid_cell_border ">0.819</td><td class=" grid_cell_border ">7.318</td><td class=" grid_cell_border ">4.835</td><td class=" grid_cell_border ">45945.698</td><td
class=" grid_cell_border ">37727.545</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">0.108</td><td class=" grid_cell_border ">0.000</td><td
class=" grid_cell_border ">5.215</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">4560.589</td></tr><tr><td class="grid_row_header grid_cell_border">Instance3948.37</td><td
class="failure grid_cell_border ">23.619</td><td class=" grid_cell_border ">0.867</td><td class=" grid_cell_border ">7.768</td><td class=" grid_cell_border ">4.712</td><td
class=" grid_cell_border ">49172.024</td><td class=" grid_cell_border ">37816.462</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">0.135</td><td
class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">4.803</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">5201.788</td></tr><tr
class="grid_alternating_row"><td class="grid_row_header grid_cell_border">Instance3948.38</td><td class="failure grid_cell_border ">24.341</td><td class=" grid_cell_border ">0.800</td><td
class=" grid_cell_border ">8.022</td><td class=" grid_cell_border ">4.495</td><td class=" grid_cell_border ">43127.886</td><td class=" grid_cell_border ">37162.078</td><td
class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">0.115</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">5.569</td><td class="
grid_cell_border ">0.000</td><td class=" grid_cell_border ">4384.444</td></tr><tr><td class="grid_row_header grid_cell_border">Instance3948.39</td><td class="failure grid_cell_border">26.598</td><td class=" grid_cell_border ">0.875</td><td class=" grid_cell_border ">7.918</td><td class=" grid_cell_border ">5.324</td><td class=" grid_cell_border ">46341.585</td><td
class=" grid_cell_border ">36920.218</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">0.120</td><td class=" grid_cell_border ">0.000</td><td
class=" grid_cell_border ">4.961</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">4678.788</td></tr><tr class="grid_alternating_row"><td class="grid_row_header
grid_cell_border">Instance3948.40</td><td class="failure grid_cell_border ">27.842</td><td class=" grid_cell_border ">0.853</td><td class=" grid_cell_border ">7.067</td><td
class=" grid_cell_border ">5.249</td><td class=" grid_cell_border ">48441.839</td><td class=" grid_cell_border ">36131.505</td><td class=" grid_cell_border ">0.000</td><td
class=" grid_cell_border ">0.112</td><td class=" grid_cell_border ">0.000</td><td class=" grid_cell_border ">4.844</td><td class=" grid_cell_border ">0.000</td><td class="
grid_cell_border ">5037.172</td></tr></tbody></table><p></p><p></p><p>Thanks in advance,</p><p>Stuart</p>
### Thanks ###