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Production OLTP SQL Server with All Files on One Raid 10 drive...

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SQL Server 2014, 8 CPUs, degree of parallelism 16, 256 GB of RAM... This is a physical box, not on a SAN.I work for a small company that uses quite a few vendor software products and am in the middle of an upgrade with Sunguard that involves moving from Informix to SQL Server. The Sunguard folks have set up the SQL Server, though I don't know under whose specs it was purchased.I got my first look at it yesterday and it has a single, 1.63T drive, RAID 10 with 6 drives. Zero partitions. All the databases that have been migrated from Informix are in the Primary file group. It's configured to have TempDB, Logs, etc. all there in Primary as well.Has anybody worked with a machine set up this way? This box will host business critical databases, accounting, financial, payroll, etc. I just found out that there is a vague idea that it will be clustered and there is another identical machine still in the box for that purpose. The in-house practice is to use Networker to copy backup files to tape (that doesn't seem useful if there is an emergency).What do I need to know to make rational decisions bout this? Should I be worried? Fragmentation? Corrupted data files? I'm imagining all kinds of potential monsters but are they real?Advice from anyone who has tried this sort of set up would be appreciated. Thanks!

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