Term
| What does VMware DirectPath I/O allow a guest VM to directly access? |
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Definition
| An I/O device via bypassing the virtualization layer |
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Term
| VMDirectPath requires support from an I/O memory management unit (IOMMU) called? |
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Definition
| Virtual Technology for Directed I/O (VT‐d), found on Intel Xeon 5500 systems (and newer). |
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Term
| A VM guest can support how many VMDirectPath devices? |
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Definition
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Term
| Active/Passive storage arrays use what path policy? |
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Definition
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Term
| Active/Passive storage arrays should avoid what type of pathing (and why)? |
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Definition
| Fixed path (to avoid LUN thrashing) |
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Term
| What purpose does a RDM file serve on a VMFS volume? |
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Definition
| It is a proxy for the device, which contains metadata used for managing and redirecting access to the physical disk. |
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Term
| When utilizing RDM, what are the two modes available? |
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Definition
| Virtual compatibility mode and Physical compatibility mode. |
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Term
| What advantages does Virtual compatibility mode have over Physical compatibility mode? |
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Definition
| Advanced file locking for data protection and use of snapshots. |
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Term
| Physical compatibility mode offers what advantages over virtual mode? |
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Definition
| The VMkernel passes all SCSI commands to the device, with one exception, thereby exposing all the physical characteristics of the underlying hardware. |
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Term
| What four things can be filtered using vCenter Storage filters? |
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Definition
| Automatic Host Rescans, used VMFS storage, used RDM storage, and Host & Transport filter. |
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Term
| What is the command to list volumes that are detected as snapshots/replicas? |
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Definition
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Term
| What is the command to force-mount a snapshot/replica volume until the next ESX reboot? |
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Definition
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Term
| What is the command to force-mount a snapshot/replica volume persistently? |
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Definition
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Term
| What is the command to resignature a snapshot/replica volume? |
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Definition
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Term
| What command is used to look at the Multipath Plug-ins currently installed on your ESX host? |
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Definition
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Term
| To list servers that the vSphere Management Assistant knows of, use what command? |
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Definition
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Term
| What is the command to target a known server with vMA? |
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Definition
| vifptarget -s (Note: vifpinit is deprecated) |
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Term
| To list the datastores on a host, use what command? |
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Definition
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Term
| What command shows the current claimrules list? (Useful for masking a LUN) |
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Definition
| esxcli corestorage claimrule list |
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Term
| What is the command to hide a LUN using the MASK_PATH plugin? |
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Definition
| esxcli corestorage claimrule add --rule -t location -A -C -T -L -P MASK_PATH |
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Term
| What is the range of valid rule numbers when creating custom MASK_PATH rules? |
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Definition
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Term
| After creating a custom MASK_PATH rule, what command will load the rule? |
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Definition
| esxcli corestorage claimrule load |
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Term
| To dissociate a storage path from NMP and have them associated to MASK_PATH, run what command? |
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Definition
| esxcli corestorage claiming reclaim -d |
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Term
| What is the path to vscsiStats? |
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Definition
| /usr/bin/vmware/bin/vscsiStats |
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Term
| What command shows the world group IDs for vscsiStats? |
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Definition
| /usr/lib/vmware/bin/vscsiStats -l |
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Term
| What command starts a vscsiStats collection? |
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Definition
| /usr/lib/vmware/bin/vscsistats -s -w worldGroupID -i handleID |
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Term
| What command stops a vscsiStats collection? |
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Definition
| /usr/lib/vmware/bin/vscsistats -x |
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Term
| What are the 5 histograms available with vscsiStats? |
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Definition
| /usr/lib/vmware/bin/vscsistats -p < ioLength | seekDistance | outstandingIOs | latency | interarrival > |
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Term
| What command is used to enable IPv6 for the VMkernel? |
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Definition
| vicfg/esxcfg-vmknic -6 true |
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Term
| What command is used to enable IPv6 for the Service Console? |
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Definition
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Term
| What command is used to verify that IPv6 has been enabled? |
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Definition
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Term
| What are some support issues when using IPv6 on ESX? |
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Definition
| Not supported: High Availability and Fault Tolerance, TCP Segmentation Offload (TSO). Experimental in ESX 4.0: IPv6 Storage (iSCSI & NFS). |
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