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Timekeeping best practices for Linux

VMware KB article 1006427 presents best practices for Linux timekeeping. These recommendations include specifics on the particular kernel command line options to use for the Linux operating system of interest. There is also a description of the recommended settings and usage for NTP time sync, configuration of VMware Tools time synchronization, and Virtual Hardware Clock configuration, to achieve best timekeeping results.

What surprised me is the recommendation done by VMware; “Note: In all cases use NTP instead of VMware Tools periodic time synchronization

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427

Deploying Volumes with Lefthand CLIQ

Due to my extreme busy schedule I haven’t blogged for a while. Besides studying for VCDX and preparing for VMworld I’m also involved in a couple of projects. One project is designing and implementing a vSphere 4 virtual infrastructure. The VI will host an Exchange 2010 environment. Due to the size of my client’s environment, 192 TB is used for hosting mailboxes. These datastores will be available thru RDM, which means creating 192 1-TB volumes and assigning them to every ESX host in the cluster.

I’ve tried to use the Centralized Management Console, but it’s tedious and error prone work. Mind numbing repetitive exercises makes me ask really dumb questions on twitter such as where did SCSI id 7 go? <homer>D’oh!</homer>. So to protect myself from further bashing and being ridiculed I started to search for the Lefthand CLI to be able to automate the creation and assignment of volumes on a Lefthand SAN.

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Deploying Volumes with Lefthand (CLIQ)

Due to my extreme busy schedule I haven’t blogged for a while. Besides studying for VCDX and preparing for VMworld I’m also involved in a couple of projects. One project is designing and implementing a vSphere 4 virtual infrastructure. The VI will host an Exchange 2010 environment. Due to the size of my client’s environment, 192 TB is used for hosting mailboxes. These datastores will be available thru RDM, which means creating 192 1-TB volumes and assigning them to every ESX host in the cluster.

I’ve tried to use the Centralized Management Console, but it’s tedious and error prone work. Mind numbing repetitive exercises makes me ask really dumb questions on twitter such as where did SCSI id 7 go? <homer>D’oh!</homer>. So to protect myself from further bashing and being ridiculed I started to search for the Lefthand CLI to be able to automate the creation and assignment of volumes on a Lefthand SAN.

Continue reading

VMworld 2009 sessions

After skipping both VMworld events in 2008 I’m attending the VMworld event in San Francisco. This is the first event after VMware released vSphere and I hope to see much in-depth information about the OS and it’s new features.  Duncan Epping  and Eric Sloof  posted info about interesting sessions, so I started browsing the session catalog as well.
The following sessions seems to be very interesting; Continue reading

Flex10 update

In my first post I had a question about the path data travels when sent to a “standby” virtual connect module.
To quote my own question :

“What will happen if the VMkernel decides to use that nic to send IO?
Is the Flexnic aware of the standby status of it “native” uplink? Will it send data to the uplink of the VC module it’s connected to or will it send data to the active uplink?
How is this done? Will it send the IO through the midplane or CX-4 cable to the VC module with the active uplink? And if this occurs what will be the added latency of this behavior?
HP describes the standby status as blocked, what does this mean? Will virtual connect discard IO send to the standby IO, will it not accept IO and how will it indicate this?”

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