{"id":2907,"date":"2012-05-04T15:33:31","date_gmt":"2012-05-04T07:33:31","guid":{"rendered":"http:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/?p=2907"},"modified":"2013-06-14T09:40:04","modified_gmt":"2013-06-14T01:40:04","slug":"comparing-smb-perfornace-of-using-rdm-or-vmdk-on-esxi-5-0","status":"publish","type":"post","link":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/?p=2907","title":{"rendered":"Comparing of SMB performance of using RDM and VMDK on ESXI 5.0"},"content":{"rendered":"<p>Testing environment :<\/p>\n<p>Dell Optilex 990 + VMWare ESXi 5.0 U2 + single local 500GB SATA 7200rpm disk for data testing<\/p>\n<p>Client : Windows 7&#215;64 with 6GB RAM<\/p>\n<p>Case 1 : provision of a single SATA 500GB disk using physical RDM, write and read a 8GB video file<\/p>\n<p>write : ~53MB\/s &#8211; 55MB\/s<\/p>\n<p>read : ~62.5MB\/s &#8211; 66MB\/s<\/p>\n<p>write and read a 4GB video file<\/p>\n<p>write : ~70MB\/s, read : ~62MB\/s &#8211; 63MB\/s<\/p>\n<p>Case 2 : The SATA 500GB disk is formatted with VMFS (lazy zeroed) and a single 500GB VMDK is attached, write and read a 8GB video file<\/p>\n<p>write : ~27MB\/s &#8211; 32MB\/s (initial) ~50MB\/s after several delete and\u00a0 re-write<\/p>\n<p>read : ~54MB\/s &#8211; 56MB\/s<\/p>\n<p>Case 3 : The SATA 500GB disk is formatted with VMFS (eager zeroed) and a single 500GB VMDK is attached, write and read a 8GB video file<\/p>\n<p>write : ~48MB\/s &#8211; 52MB\/s<\/p>\n<p>read : ~59MB\/s &#8211; 66MB\/s<\/p>\n<p>write and read a 4GB video file<\/p>\n<p>write : ~66MB\/s, read : ~~50MB\/s &#8211; 53MB\/s<\/p>\n<p>Case 4 : The SATA 500GB disk is formatted with VMFS (thin provision) and a single 500GB VMDK is attached, write and read a 8GB video file<\/p>\n<p>write : ~26MB\/s (initial), ~50MB\/s after several delete and\u00a0 re-write<\/p>\n<p>read : ~47MB\/s &#8211; 50MB\/s<\/p>\n<p><a href=\"http:\/\/www.vmware.com\/pdf\/Perf_Best_Practices_vSphere5.0.pdf\">http:\/\/www.vmware.com\/pdf\/Perf_Best_Practices_vSphere5.0.pdf<\/a><\/p>\n<p>See this as well : <a href=\"http:\/\/www.ntpro.nl\/blog\/archives\/2241-Mythbusting-Disk-provisioning-type-doesnt-affect-performance.html\">http:\/\/www.ntpro.nl\/blog\/archives\/2241-Mythbusting-Disk-provisioning-type-doesnt-affect-performance.html<\/a><\/p>\n<p>Testing Using PowerEdge R720XD with ESXI 5.1U1<\/p>\n<p>Client : Windows 7&#215;64 with 16GB RAM<\/p>\n<p>Case 1 : Provision of a local RAID 5 VD forming using 4x500GB SATA disk using eager zero thin provision<\/p>\n<p>Sequential write speed : ~62MB\/S &#8211; ~63MB\/s for a 265GB of data set<\/p>\n<p>Case 2 : Provision of a local RAID 5 VD forming using 4x500GB SATA disk using rdm<\/p>\n<p>sequential write speed : ~67MB\/s &#8211; ~70MB\/s fr a 265GB of data set<\/p>\n<p>Conclusion : In my environment, which the data disk is provisioned by a local RAID Controller on the same server, rdm still provide a little bit more performance than using VMDK (~5% to 8%), in contrast to the references provided by the net (which the comparisons are usually done on robust NAS\/SAN storage)<\/p>\n<p>More Reference : <a href=\"http:\/\/blogs.vmware.com\/vsphere\/2013\/01\/vsphere-5-1-vmdk-versus-rdm.html\">http:\/\/blogs.vmware.com\/vsphere\/2013\/01\/vsphere-5-1-vmdk-versus-rdm.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Testing environment :<\/p>\n<p>Dell Optilex 990 + VMWare ESXi 5.0 U2 + single local 500GB SATA 7200rpm disk for data testing<\/p>\n<p>Client : Windows 7&#215;64 with 6GB RAM<\/p>\n<p>Case 1 : provision of a single SATA 500GB disk using physical RDM, write and read a 8GB video file<\/p>\n<p>write : ~53MB\/s &#8211; 55MB\/s<\/p>\n<p>read : [&#8230;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[3],"tags":[18],"class_list":["post-2907","post","type-post","status-publish","format-standard","hentry","category-computer","tag-vmware","odd"],"_links":{"self":[{"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2907","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2907"}],"version-history":[{"count":31,"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2907\/revisions"}],"predecessor-version":[{"id":2916,"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2907\/revisions\/2916"}],"wp:attachment":[{"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2907"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2907"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/staff.ie.cuhk.edu.hk\/~sfluk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}