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John Tan
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PowerCLI script to move VMs from the Root Resource pool to a Specific Resource Pool
While troubleshooting an performance issue on a VM today, I noticed a misconfiguration in the resource pool settings. In this specific cluster, there was a bunch of VMs in the root of the resource pool, hence, skewing the resources to be granted when there ...
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List of ESXcli Commands
Below is a list of ESXcli commands and the required parameters for reference: $esxcli.device
$esxcli.device.alias
$esxcli.device.alias.get(string alias)
$esxcli.device.alias.list()
$esxcli.esxcli
$esxcli.esxcli.command
$esxcli.esxcli.command.list()
$esxcli....
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Finding VMs Affected by HA Failover for a Specific Cluster
While vSphere HA is a lifesaver in terms of managing and automatically recovering from host failures, finding out the VMs that were impacted is not as easy. In order to find out which VMs were restarted successfully by HA, you would have to drill down into ...
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Resizing Partition with Bad Sectors in GParted
Recently I tried to expand a Windows 2003 system drive on a VM using GParted but was not able to as it kept complaining about bad sectors. The recommended fix was to run chkdsk /f /r on Windows and then reboot it twice. After applying the recommended fix an...
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Backing up VMs with vRDM using Veeam over FC Network
With the release of vSphere 5.5, the size limitation for a virtual RDM has been increased substantially to a limit of 62TB. In my opinion, this makes the use of physical RDMs redundant unless they are needed for some type of Microsoft Clustering or bus shar...
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Upgrading vCenter from 5.1 to 5.5 with Multisite SSO and Linked Mode
A month ago, I upgraded our vSphere environment was from 5.1 to 5.5. This post documents the steps required to upgrade a linked mode vCenter environment with multisite SSO from 5.1 to 5.5. Here's a summary of the environment I was working with (original con...
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Setting Perennially Reserved flags for RDM LUNs via PowerCLI
A while back, I blogged about slow ESXi host boot times . After troubleshooting the issue, it was determined that the root cause was caused by a known issue in vSphere 5 and RDM LUN mappings. During the initial boot of an ESXi 5 host, the system attempts to...
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Associating RDMs to the corresponding VMs
In order to decommission an older SAN, I had to migrate all the LUNs off. The process to migrate LUNs associated with datastores is easy - create new datastores on the new SAN, attach to the same ESXi hosts and then svMotion all the VMDKs over. The other sc...
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