Tag Archives: performance

Jumbo vs Flow Control

Posted on January 8, 2012 by josh@sostechblog.com

Don’t forget to check your Ethernet switches for Jumbo vs Flow Control support and recommendations – and double check your config to make sure it matches. Some switches support both, some prefer one over the other – or you might … Continue reading →

Posted in Computing, NetApp, Storage, Virtualization, VMware | Tagged , , , , , , , , | 1 Comment

VMDK alignment (Free p2v / v2v)

Posted on September 27, 2011 by josh@sostechblog.com

Disk alignment is a known problem in virtual environments. Older guest OS (primarily Windows before 2008 tho *nix has the same issue) would start their partitions slightly off the boundary which could cause an increased amount of IOPS. You can … Continue reading →

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Are you thin, thick or just lazy?

Posted on August 11, 2011 by josh@sostechblog.com

vSphere 5 is almost upon us and I’ll try to start throwing out nuggets (now that I’ve learned the Beta NDA is over). One of my favorite tidbits is the new way to create hard drives (VMDKs) for virtual machines. … Continue reading →

Posted in Cloud, Computing, Storage, Virtualization, VMware | Tagged , , , | 7 Comments

VMware vSphere 4.1 training

Posted on March 8, 2011 by josh@sostechblog.com

For vSphere 4.0 VMware had a “Install, Configure, Manage” or ICM class that lasted four 8-hour days. You could also opt for a 5-day “FastTrack” class that took the ICM and added components from the “Performance” and “Troubleshooting” classes and … Continue reading →

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VMware iSCSI multipath (Round Robin) for Equallogic Part 2

Posted on February 4, 2011 by josh@sostechblog.com

Must read update for Equallogic multipath vSphere5 multi-path walkthrough Update: tag all Round Robin LUNs in one script Earlier I posted an entry about manually creating what you need for iSCSI multipath on vSphere 4.1 with an Equallogic storage array. … Continue reading →

Posted in Computing, Equallogic, Scripting, Storage, Virtualization, VMware | Tagged , , , , , , , , | 14 Comments