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Vol. 1 No. 9 November 2002

Virtualize the right way

I'm often asked what the value of storage virtualization is and what the best ways to use it are. Without a doubt, in a well-thought-out implementation, virtual storage provides many cost-saving benefits. In fact, there's practically no way to avoid it because RAID virtualization is so common in disk subsystems. But unplanned virtualization can spread data over many disks in an array, and in the process, unwittingly introduce major performance problems. Planning for virtulaization Structure disk allocations to workloads. Limiting RAID choices to 0 and 0+1 makes the process of mixing applications across disks much easier. In transaction processing environments, RAID 0+1 has the major advantage of spreading out the I/Os over a number of disk drives. Make sure that the array drives have similar specifications so as not to create a bottleneck. RAID 5's read/modify/write penalty impacts the performance of all the applications storing data on drives in the array. Distribute high I/O applications across all the disks in the array The ...

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