Recently I got involved in a discussion about “Creating multiple Datacenters with one Clusters rather than one Datacenter with multiple Clusters” First of all lets get the definitions of these objects summarized (as stated in the vSphere Datacenter Administration Guide) Clusters A collection of ESX/ESXi hosts and associated virtual machines intended to work together as [...]
All posts in category VMware vCenter
Datacenters vs Clusters within the vCenter Inventory
Posted by Kenneth van Ditmarsch on February 3, 2012
http://virtualkenneth.com/2012/02/03/datacenters-vs-clusters-within-the-vcenter-inventory/
VMFS3 Heap Size (MaxHeapSizeMB)
This article gives you more information on the VMFS3.MaxHeapSizeMB advanced parameter. Let’s start off with VMware KB article 1004424 describing the method to increase the VMFS3 Heap Size in case you see the following error message in /var/log/vmkernel or /var/log/messages log: vmkernel: 8:18:59:58.640 cpu2:1410)WARNING: Heap: 1370: Heap_Align(vmfs3, 4096/4096 bytes, 4 align) failed. caller: 0x8fdbd0 vmkernel: 8:18:59:58.640 [...]
Posted by Kenneth van Ditmarsch on February 15, 2011
http://virtualkenneth.com/2011/02/15/vmfs3-heap-size-maxheapsizemb/
vCenter Performance Tab – Real-time vs. Historical Data
Recently I received a question about the Performance tab within vCenter which intrested me. Looking at the available Chart Options we can see that there are two distinctive performance streams: Real-time data Historical data
Posted by Kenneth van Ditmarsch on February 7, 2011
http://virtualkenneth.com/2011/02/07/vcenter-performance-tab-real-time-vs-historical-data/
VMware vCenter Port 80 invalid or already in use
While installing VMware vCenter 4.x with Microsoft SQL 2008 (R2) installed on the same system you might get the following error message: The following port numbers are either invalid or already in use. VMware VirtualCenter HTTP Port: 80 By default vCenter wants to use port 80 for the HTTP service and using the netstat command you [...]
Posted by Kenneth van Ditmarsch on December 8, 2010
http://virtualkenneth.com/2010/12/08/vmware-vcenter-port-80-invalid-or-already-in-use/
How to quickly discover a "VM to Resource Pool" mapping
Everyone knows the situation in where a (s)VMotion asks you to select a Resource Pool. I would love to see that VMware automatically selects the current VM’s Resource Pool but unfortunately we have to make a selection since it defaults to the cluster. When we leave it to default it obviously causes the VM to [...]
Posted by Kenneth van Ditmarsch on January 29, 2010
http://virtualkenneth.com/2010/01/29/how-to-quickly-discover-a-vm-to-resource-pool-mapping/
VMware vCenter Storage Views: Partial/No Redundancy
While exploring my software iSCSI initator environment I noticed that all my VM’s on every host are reporting a “Partial/No Redundancy”-status within the Multipathing Status even though I have Round Robin in place and thus 2 paths to the storage. This behavior is a bug as confirmed by VMware Technical Support. The rule for displaying [...]
Posted by Kenneth van Ditmarsch on December 15, 2009
http://virtualkenneth.com/2009/12/15/vmware-vcenter-storage-views-partialno-redundancy/
Creating easy to identify LeftHand Volumes on ESX/vSphere
Coming from mostly HP EVA environments I got used to identify a Volume/LUN by there LUN number which was a real unique identifier. I could always ”talk” LUN number and be sure that it was understood and unique. So ever since I’ve been working with our LeftHand environment I disliked the way that every Volume/LUN is marked [...]
Posted by Kenneth van Ditmarsch on December 3, 2009
http://virtualkenneth.com/2009/12/03/creating-easy-to-identify-lefthand-volumes-on-esxvsphere/
Automatic Rescan of your HBAs… How to enable this again
Duncan Epping wrote an helpful article about disabling the automatic rescan of HBA’s whenever you add, remove of expand a datastore. Remember, turning this off isn’t a best practise for production environments but could come in handy when building a new site while avoiding “rescan storms”. Now the trick is to enable [...]
Posted by Kenneth van Ditmarsch on October 9, 2009
http://virtualkenneth.com/2009/10/09/automatic-rescan-of-your-hbas-how-to-enable-this-again/
VMware Update Manager on vSphere – Check the Firewall!
Yesterday I noticed something strange while updating a VI3 environment to vSphere with Update Manager 4.0 The update of update manager went fine as well as the creation of new baselines. Whenever I remediated a Host, the Host went into maintenance mode and the remediate process hangs on 33%. This same behaviour occured when I [...]
Posted by Kenneth van Ditmarsch on August 27, 2009
http://virtualkenneth.com/2009/08/27/vmware-update-manager-on-vsphere-check-the-firewall/
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