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massive i/o bottleneck

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We’re using Microsoft SQL Server 2014 - 12.0.4213.0 (X64) Jun 9 2015 12:06:16 Copyright (c) Microsoft Corporation Standard Edition (64-bit) on Windows NT 6.3 <X64> (Build 9600: )We have a few processes that process massive amounts of data daily. When they run the Queue length on the data drive fills and we end up w/ several other processes waiting for i/o. It’s so bad that when it's happening you can’t even expand the database in sql server management studio. Has anyone else ran into this issue? My plan was to either break the primary offenders database mdf file to multiple drives or give him his own drive and break out all the other db's onto different sets of drives. Would setting up buffer extensions help?Anyone have any ideas? Right now the CPU is staying level between 5 and 20 percent for the most part.

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