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Pointers on Setting up disks for DBs<br />
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When experimenting, should partition RAID into (say) 5 parts<br />
Then can save tuned databases on different partitions<br />
Can reinitialize file system on old partition and copy data from<br />
another; avoids file system fragmentation of multiple loads<br />
Can also build a new database on reinitialized partition<br />
Don’t worry about “raw disk”: current OS file I/O is great<br />
You will find that the lower-numbered partitions have faster<br />
sequential reads, because of disk “zones”<br />
effect is about 30% for enterprise disks, more for cheap disks<br />
Just be aware of this effect, so you don’t misinterpret results<br />
You can buy enterprise disks to use on an ordinary tower PC<br />
We used a Dell PowerEdge 2900, nice accessible internals<br />
Added SAS RAID controller, SAS disks<br />
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