darrylcauldwell.com On a journey around the datacenter and public cloud.

Windows Server 2012 - SAN Performance

In a newly deployed Windows Server 2012 HyperV environment with around sixty nodes, running a couple of hundred Windows Server 2012 virtual machines running various applications. We found t he EMC VMX storage which underpinned this became massively busy with Write IO at around 3am,
the Write IO was mostly coming from TRIM and Unmap commands, the amount has a dramatic impact and leads to lots of 153 errors on the server estate, after one to two hours the Write IO subsided. I wrote a script to audit the estate to identify if there was any pattern to the errors. We found the errors correlated to the 3am Window also.

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Install NetApp VAAI For NFX On vSphere 5.5

Data ONTAP 8.0.1 and later supports certain VMware vStorage APIs for Array Integration (VAAI) features when the ESX host is running ESX 4.1 or later. These features help offload operations from the ESX host to the storage system and increase the network throughput. The ESX host enables the features automatically in the correct environment. You can determine the extent to which your system is using the VAAI features by checking the statistics contained in the VAAI counters.

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Configuring Synology NFS For ESXi

The function of my NAS within homelab is to provide shared storage for my ESXi hosts, as I’m studying for VCAP it would be great to use both iSCSI and NFS. By default NFS is disabled on the DS213J,  first step is to enable it.

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Configuring Synology iSCSI For ESXi

To configure a Synology disk station to present LUNs as iSCSI for ESXi hosts is straight forwards. As unlike NFS, iSCSI support is enabled by default.

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Image Builder: Create A Custom ESXi ISO

If you find an occasion where some drivers you need are missing from the VMware provided ISO for installing ESXi you can use Image Builder to create your own custom ISO file.

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