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Storage Planning for Virtual Infrastructures -- More Than Just Managing Latency

Feb 17, 2012, 17:02 (0 Talkback[s])
(Other stories by Henry Newman)

[ Thanks to Amy Newman for this link. ]

"Storage planning for virtualized systems requires some careful thinking about the issues that will impact users. One major tradeoff of virtualizing systems is that you are trading local bandwidth for network bandwidth. In a nonvirtualzaed environment, each user has local storage for at least booting his system and very often for his data as well. On a virtualized system, the user boots up over the network and accesses applications and data over the network. Here, network performance and, more importantly, network latency is critical. We all know that the seek+latency on a standard enterprise SATA drive is around 4.16 ms for seek and between 8.5ms (read) and 9.5ms (write) depending on the drive manufacturer. This is not going to change, so latency must be considered."

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