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Reading large data blocks from RAID storage appliances, normally requires that disk array reads from each drive, combines fragments and passes on to the external interface such as FC, iSCSI, IB or SAS. Each drive in the array has a difference speed, and even same model disks have slightly difference response times. Plus, seek time might differ depending on where the heads were on each disk in the array before the read request came in. Therefore, drives will complete the read request at different points in time.
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