vQuicky – WHEN DOES SPILT I/O OCCUR

So I was reading a article today about storage and wanted to write a couple of lines about Split I/O.

In the most simplest terms – split I/O occurs when the OS reads or writes from or to the disk but the way the blocks are stored – the storage uses multiple writes or reads to get that data causing latency and delay and increased storage resource consumption. Basically, multiple I/O operations by the storage array to retrieve that data.

To avoid split I/O – the operating system partitions need to be alinged to the disks. Partitions of Windows servers before 2008 release needed manual alignment with the disk. This was also in the case of linux/unix systems.

Split I/O can reduce storage performance to as much as 50% causing some major drag in I/O operations.

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