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Pluggable Hard Drives

What is the difference in performance between a 10K and a 15K Ultra320 pluggable hard drives for a server?
Bob Macpherson
Bob Macpherson
4 Solutions
Raw spin speed basically.  The environment around them will have an effect as to whether you notice a difference.  For example, if you are running them both through a slowish interface then you are unlikely to notice a benefit.  Other factors are poorly cabling, other devices on the SCSI bus, PCI bus (if relevant), etc.
Bob MacphersonAuthor Commented:
is the architecture different, is it worth to spend 70% for the 15K. We have 10/100 CAT5 cabling thruout the company. and the servers are HP DL380 3.6 Ghz with 2-4 GB RAM. I heard that the 15K have a tendency to brake down more often because they spin faster, is that true?
spin speed has a direct corelation to seek time.  a drive spinning 50% faster will experience a theoretical 50% increase in seek time.

the benefits come from what you're accessing.  if you are accessing lots of small files then it will benefit you more than if you are reading large chunks of data from the drives (assuming no fragmentation).  again, it really depends on what you're trying to put through the pipe.  large files vs lots of small files.
Main difference is seek time. 15K rpm drive will be able to fetch lots of small files more quickly. There is comparison of 10K and 15K rpm SCSI drives:

IMHO unless you need absolutely fastest disk - choose 10K rpm.
There is not a significant difference in the failure rates of 15K and 10K drive, statistically speaking of course.  We have suffered "runs" of failures on both speeds at various times.  

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