<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div dir="ltr" > </div>
<div dir="ltr" >I was talking to a former colleague yesterday.</div>
<div dir="ltr" >He was asking about of people ever use AFM to mount a cached fileset not from a different cluster but from you own GPFS cluster.</div>
<div dir="ltr" >This would be a Flash/SSD based fileset caching from NL-SAS based Storage Pools.</div>
<div dir="ltr" > </div>
<div dir="ltr" >The motivation was to enable at least some of the 4 features of Cray's DataWarp accelerator:</div>
<div dir="ltr" > </div>
<div dir="ltr" >1. Burst buffer for HPC writes.</div>
<div dir="ltr" >This is motivated by the shift from say 5 years ago when your bought HPC /scratch for volume and got the bandwidth for free, but now if you buy for bandwidth you end up buying say 3x more space than you really need so overly expensive.</div>
<div dir="ltr" > </div>
<div dir="ltr" >2. Staging for Read-only files. Batch job prefetches file into the cached fileset so parallel execution starts quicker</div>
<div dir="ltr" > </div>
<div dir="ltr" >3. Local '/tmp' for MPI processes which might be faster or bigger than what each compute node has.</div>
<div dir="ltr" > </div>
<div dir="ltr" >4. a shared /tmp where some MPI processes write files that other then read.</div>
<div dir="ltr" >Compare this with a simple file placement rule that puts these files on an SSD Storage Pool</div>
<div dir="ltr" > </div>
<div dir="ltr" > </div>
<div dir="ltr" >So does anyone actually do this?</div>
<div dir="ltr" >and if so what was your experience?</div>
<div dir="ltr" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family:Arial;font-size:10.5pt" ><div class="socmaildefaultfont" dir="ltr" style="font-family: Arial; font-size: 10.5pt;" ><div class="socmaildefaultfont" dir="ltr" style="font-family: Arial; font-size: 10.5pt;" ><div class="socmaildefaultfont" dir="ltr" style="font-family: Arial; font-size: 10.5pt;" ><div class="socmaildefaultfont" dir="ltr" style="font-family: Arial; font-size: 10.5pt;" ><div class="socmaildefaultfont" dir="ltr" style="font-family: Arial; font-size: 10.5pt;" ><div class="socmaildefaultfont" dir="ltr" style="font-family: Arial; font-size: 10.5pt;" ><div dir="ltr" style="margin-top: 20px;" ><div style="font-family: sans-serif; font-size: 8pt; margin-top: 10px;" ><div style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;" ><span style="font-size:1.143em;" ><span style="font-family: Verdana,Geneva,sans-serif;" >Daniel</span></span></div>
<div style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;" ><img alt="/spectrum_storage-banne" src="" src="http://ausgsa.ibm.com/projects/t/tivoli_visual_design/public/2015/Spectrum-Storage/Email-signatures/Storage/spectrum_storage-banner.png" style="width: 601px; height: 5px;" ></div>
<div style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;" ><br> </div>
<table cellpadding="0" cellspacing="0" border="0" > <tbody> <tr> <td style="width:201px;padding:0cm 0cm 0cm 0cm;" > <div style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;" ><img alt="Spectrum Scale Logo" src="" src="http://ausgsa.ibm.com/projects/t/tivoli_visual_design/public/2015/Spectrum-Storage/Email-signatures/Storage/spectrum_scale-logo.png" style="width: 75px; height: 120px; float: left;" ></div>
<div style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;" > </div> </td> <td style="width:21px;padding:0cm 0cm 0cm 0cm;" > </td> <td style="width:202px;padding:0cm 0cm 0cm 0cm;" > <div style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;" ><strong><span style="font-family:Arial, Helvetica, sans-serif" ><span style="font-size:10.0pt;" >Dr Daniel Kidger</span></span></strong><br> <span style="font-family:Arial, Helvetica, sans-serif" ><span style="font-size:7.5pt;" >IBM Technical Sales Specialist<br> Software Defined Solution Sales<br> <br> +</span></span><span style="color:#5F5F5F;" ><span style="font-family:Verdana, Geneva, sans-serif" ><span style="font-size:10.0pt;" >44-(0)7818 522 266 </span></span></span><br> <span style="color:#5F5F5F;" ><span style="font-family:Arial, Helvetica, sans-serif" ><span style="font-size:8.0pt;" >daniel.kidger@uk.ibm.com</span></span></span></div> </td> </tr> </tbody></table><font size="2" face="Default Sans Serif,Verdana,Arial,Helvetica,sans-serif" > </font></div></div></div></div></div></div></div></div></div></div></div></div>Unless stated otherwise above:<BR>
IBM United Kingdom Limited - Registered in England and Wales with number 741598. <BR>
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU<BR>
<BR>