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VCAP-DCA Section 1

VCAP-DCA Section 1. Implement and Manage Storage Sean Crookston http://Twitter.com/vfail http://www.vfail.net. Configure vCenter Server Storage Filters What is the Pluggable Storage Architecture Changing a multipath policy Software iSCSI Port Binding(Multipathing) Open Forum.

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VCAP-DCA Section 1

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  1. VCAP-DCA Section 1 Implement and Manage Storage Sean Crookston http://Twitter.com/vfail http://www.vfail.net

  2. Configure vCenter Server Storage Filters • What is the Pluggable Storage Architecture • Changing a multipath policy • Software iSCSI Port Binding(Multipathing) • Open Forum

  3. The VCAP-DCA Exam • 40 live lab questions • Tasks for each lab can be a scoring opportunity • Some have more weight then others • Passing score tbd based on beta • Approx 4 hours • Should receive results within two weeks • Will remain based on 4.0 until next major release, i.e. 4.5, 5.0

  4. The VCAP-DCA Exam • Lab Environment • All PDF documentation for related products will be available on the desktop. • Scoring is based on checking configurations and characteristics of items after you have completed them. • Some items may be dependent on earlier items to work. • Doesn’t matter how you get it done.

  5. Resources • http://kendrickcoleman.com/index.php?/Tech-Blog/vcap-datacenter-administration-exam-landing-page-vdca410.html • http://communities.vmware.com/community/vmtn/certedu/certification/vcap • http://www.ntpro.nl/blog/archives/1585-Looking-for-VCAP-practice-questions-Here-they-are....html

  6. Configure vCenter Server Storage Filters • Done through the Gui • AdministrationvCenter Server SettingsAdvanced Settings

  7. Configure vCenter Server Storage Filters • Config.vpxd.filter.vmfsFilter When set to false, allowed to add a VMFS volume to a VM even when in use by another VM. • Config.vpxd.filter.rdmfilter When set to false, allowed to add a LUN as and RDM even when in use by another VM. • Config.vpxd.filter.SameHostandTransportsFilter When set to false, incompatible luns are allowed to be added as extents. • Config.vpxd.filter.hostRescanFilter When set to false, the auto rescan for all hosts is disabled after adding storage.

  8. Configure vCenter Server Storage Filters • Live DEMO

  9. What is the Pluggable Storage Architecture • http://geeksilver.wordpress.com/2010/08/17/vmware-vsphere-4-1-psa-pluggable-storage-architecture-understanding/ • NMP Plugin is the default VMware Native Multipathing Plug-In. It is responsible for managing the sub-plugins which are included by VMware or provided by 3rd parties. • The first type of which is the SATP, or Storage Array Type Plug-In. • Responsible for Array specific functions • Can be 3rd party or provided by VMware • The second type is the PSP or Path Selection Plug-In. • Chooses path for I/O Requests • Default assigned based on SATP, which can be overridden. • Additionally 3rd party MPPs or Multipathing Plug-Ins can be used, such as EMC PowerPath. This is used in leiu of the NMP. • Mask_PATHPlugin is loaded to mask paths, effectively preventing a host from accessing storage devices/LUNs or from specific paths to such.

  10. Changing a multipath policy • Can be done by Gui or Command Line • Fixed, Fixed_AP, MRU, RR • From the command line Esxcli –server ip/host nmp device setpolicy –device naa.iiiiiiiiiiiii -psp VMW_PSP_MRU

  11. Changing a multipath policy Fixed • Uses designated preferred path if configured, otherwise uses for discovered working path at boot. • When it can’t be used a random alternative path is used. • Preferred path is automatically reverted to when it comes back.

  12. Changing a multipath policy Fixed_AP • Extends fixed functionality to active/passive and ALUA mode arrays. • When not specified, path will be selected by Array path preference & Current Path State.

  13. Changing a multipath policy MRU • Uses first working path discovered at boot • Switches to alternative path and will continue using this path even if original path comes back online.

  14. Changing a multipath policy RR • Automatic path selection that enables load balancing across paths. • Only uses active paths and use case is on Active/Active arrays. • Not supported in MSCS environments

  15. Changing a multipath policy Live Demo Esxcli –server ip/host nmp device list Esxcli –server ip/host nmp device setpolicy –device naa.iiiiiiiiiiiii -psp VMW_PSP_MRU

  16. Software iSCSI Port Binding(Multipathing) • iSCSI initiator can use multiple iSCSI sessions • Not possible with the dvswitch • Create two VMKernel NICs, each with a different active NIC. • Move other NIC’s down to unused adapters for each port respectively. • To add the Vmkernels to your SW iSCSI Initiator • esxcli swiscsi nic add -n vmk0 -d vmhba33 • esxcli swiscsi nic add -n vmk1 -d vmhba33 • esxcli swiscsi nic list -d vmhba33

  17. Software iSCSI Port Binding(Multipathing) • Verifying it worked? • Check Storage paths to confirm multiple paths • Check esxtop for traffic going down both

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