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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">still new to AFM, so some basic question on how Recovery works for a SW cache:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">we have an AFM SW cache in recovery mode – recovery first did run policies on the cache cluster, but now I see a ‘tcpcachescan’ process on cache slowly scanning home via nfs. Single host, single process, no parallelism
as far as I can see, but I may be wrong. This scan of home on a cache afmgateway takes very long while further updates on cache queue up. Home has about 100M files. After 8hours I see about 70M entries in the file /var/mmfs/afm/…/recovery/homelist, i.e. we
get about 2500 lines/s. (We may have very many changes on cache due to some recursive ACL operations, but I’m not sure.)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So I expect that 12hours pass to buildup filelists before recovery starts to update home. I see some risk: In this time new changes pile up on cache. Memory may become an issue? Cache may fill up and we can’t evict?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I wonder<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US">Is this to be expected and normal behavior? What to do about it?<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US">Will every reboot of a gateway node trigger a recovery of all afm filesets and a full scan of home? This would make normal rolling updates very unpractical, or
is there some better way?<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Home is a gpfs cluster, hence we easily could produce the needed filelist on home with a policyscan in a few minutes.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you, I will welcome and clarification, advice or comments.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Heiner<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">-- <o:p></o:p></p>
<p class="MsoNormal"><span lang="DE" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#18376A">=======================</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#18376A">Heinrich Billich</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#18376A">ETH Zürich</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#18376A">Informatikdienste</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#18376A">Tel.: +41 44 632 72 56</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#18376A">heinrich.billich@id.ethz.ch</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#18376A">========================</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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