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VCAP-DCA
VMware Certified Advanced Professional - Data Center Administrator
32
Computer Science
Professional
02/03/2011

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Cards

Term
What does VMware DirectPath I/O allow a guest VM to directly access?
Definition
An I/O device via bypassing the virtualization layer
Term
VMDirectPath requires support from an I/O memory management unit (IOMMU) called?
Definition
Virtual Technology for Directed I/O (VT‐d), found on Intel Xeon 5500 systems (and newer).
Term
A VM guest can support how many VMDirectPath devices?
Definition
Two
Term
Active/Passive storage arrays use what path policy?
Definition
Most Recently Used
Term
Active/Passive storage arrays should avoid what type of pathing (and why)?
Definition
Fixed path (to avoid LUN thrashing)
Term
What purpose does a RDM file serve on a VMFS volume?
Definition
It is a proxy for the device, which contains metadata used for managing and redirecting access to the physical disk.
Term
When utilizing RDM, what are the two modes available?
Definition
Virtual compatibility mode and Physical compatibility mode.
Term
What advantages does Virtual compatibility mode have over Physical compatibility mode?
Definition
Advanced file locking for data protection and use of snapshots.
Term
Physical compatibility mode offers what advantages over virtual mode?
Definition
The VMkernel passes all SCSI commands to the device, with one exception, thereby exposing all the physical characteristics of the underlying hardware.
Term
What four things can be filtered using vCenter Storage filters?
Definition
Automatic Host Rescans, used VMFS storage, used RDM storage, and Host & Transport filter.
Term
What is the command to list volumes that are detected as snapshots/replicas?
Definition
esxcfg-volume -l
Term
What is the command to force-mount a snapshot/replica volume until the next ESX reboot?
Definition
esxcfg-volume -m
Term
What is the command to force-mount a snapshot/replica volume persistently?
Definition
esxcfg-volume -M
Term
What is the command to resignature a snapshot/replica volume?
Definition
esxcfg-volume -r
Term
What command is used to look at the Multipath Plug-ins currently installed on your ESX host?
Definition
esxcfg-mpath -G
Term
To list servers that the vSphere Management Assistant knows of, use what command?
Definition
vifp listservers
Term
What is the command to target a known server with vMA?
Definition
vifptarget -s (Note: vifpinit is deprecated)
Term
To list the datastores on a host, use what command?
Definition
esxcfg-scsidevs --vmfs
Term
What command shows the current claimrules list? (Useful for masking a LUN)
Definition
esxcli corestorage claimrule list
Term
What is the command to hide a LUN using the MASK_PATH plugin?
Definition
esxcli corestorage claimrule add --rule -t location -A -C -T -L -P MASK_PATH
Term
What is the range of valid rule numbers when creating custom MASK_PATH rules?
Definition
101 to 200
Term
After creating a custom MASK_PATH rule, what command will load the rule?
Definition
esxcli corestorage claimrule load
Term
To dissociate a storage path from NMP and have them associated to MASK_PATH, run what command?
Definition
esxcli corestorage claiming reclaim -d
Term
What is the path to vscsiStats?
Definition
/usr/bin/vmware/bin/vscsiStats
Term
What command shows the world group IDs for vscsiStats?
Definition
/usr/lib/vmware/bin/vscsiStats -l
Term
What command starts a vscsiStats collection?
Definition
/usr/lib/vmware/bin/vscsistats -s -w worldGroupID -i handleID
Term
What command stops a vscsiStats collection?
Definition
/usr/lib/vmware/bin/vscsistats -x
Term
What are the 5 histograms available with vscsiStats?
Definition
/usr/lib/vmware/bin/vscsistats -p < ioLength | seekDistance | outstandingIOs | latency | interarrival >
Term
What command is used to enable IPv6 for the VMkernel?
Definition
vicfg/esxcfg-vmknic -6 true
Term
What command is used to enable IPv6 for the Service Console?
Definition
esxcfg-vswif -6 true
Term
What command is used to verify that IPv6 has been enabled?
Definition
vmkload_mod –l
Term
What are some support issues when using IPv6 on ESX?
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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