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  SQL Server Tips by Robin Schumacher

Storage Structure Planning

While this type of planning generally involves the creation and placement of filegroups and files, one must be careful to not put the cart before the horse. Hardware should be scrutinized first. As was already mentioned above, disk I/O contention must be avoided where possible, so having several disks available to plot out the map of the database is good idea.

At the hardware level, the usual discussion centers on whether to use a redundant array of inexpensive disks (RAID) technology or just a bunch of disks (JBOD). Complicating the decision on what type of RAID to use is that many of the hardware vendors offer smart storage technology that promises to give the DBA the best of both possible worlds.

For example, most DBAs know that write-intensive storage structures should not be placed on a RAID5 setup because of the write penalty that RAID5 imposes. Therefore, the DBA should try to place all transaction logs, TEMPDB databases, and other write-intensive objects on non-RAID5 devices, with the best configuration normally being RAID0+1.

However, a number of hardware vendors claim to have “auto” or “smart” RAID storage devices that offer the protection of RAID5 with the write speed of a RAID0 or RAID1 device. Before going down this route, the DBA should investigate and test the claims of such devices to see if they actually produce the claimed results.

The above book excerpt is from:

High-Performance SQL Server DBA
Tuning & Optimization Secrets

ISBN: 0-9761573-6-5
Robin Schumacher  


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