The HP EVA storage is optimized to perform at 128KB Max IO transfer size or less. If the host operating system uses large block size, it may reduce the storage performance. For example, ESXi use 32MB by default. To tune the value, you can go to host software advanced settings. Reference: http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/mostViewedDisplay/?javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken&javax.portlet.prp_efb5c0793523e51970c8fa22b053ce01=wsrp-navigationalState%3DdocId%253Dmmr_kc-0101662-8%257CdocLocale%253Dzh_HK&javax.portlet.tpst=efb5c0793523e51970c8fa22b053ce01&sp4ts.oid=436460&ac.admitted=1385425196533.876444892.199480143 http://h20566.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay/?spf_p.tpst=kbDocDisplay&spf_p.prp_kbDocDisplay=wsrp-navigationalState%3DdocId%253Demr_na-c02518189-4%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003469

There are two ways to allow HP command View EVA that’s installed in a virtual machine to manage the array: Virtualized SCSI mode and VMDirectPath mode. Virtualized SCSI mode – The Command View EVA instance can only view the active path to LUN 0 on a single controller. This mode is enabled by default when … Continue reading Install HP Command View EVA in VMware Virtual Machine →