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1

If you assume all else is equal, performance characteristics of disks of larger capacity don't change very much. An 10K RPM FC drive has very similar characteristics regardless of whether it's 300GB or 3TB. The platters rotate at the same rate, and the heads seek at the same speed. Sustained throughput likewise - not much difference. This is the root of a ...


0

If you are rotating disks (not SSD) then everything else being equal, transfer speed is higher if you use the outer tracks of the disk. That would happen automatically if you use a disk that is only partially filled. At the same time, if a disk is only partially filled, your average head movement would be less, and the number of head movements would be less ...


7

One place where there is a direct relationship between disk size and IOPS is in the Amazon AWS Cloud and other "cloudy services". Two types of AWS services (Elastic Block Store and Relational Database Service ) provide higher IOPS for larger disk sizes. Note that this is an artificial restriction placed by Amazon on their services. There is no ...


7

To answer your question directly - all other things being equal = no change whatsoever when GB changes. You don't measure IOPS with GB. You use the seek time and the latency. I could re-write it all here but these examples below do all that already and I would simply be repeating it: http://www.ryanfrantz.com/posts/calculating-disk-iops/ ...


11

I know this is probably a hypothetical question... But the IT world really doesn't work that way. There are realistic constraints to consider, plus other things that can influence IOPS... 50GB and 100GB disks don't really exist anymore. Think more: 72, 146, 300, 450, 600, 900, 1200GB in enterprise disks and 500, 1000, 2000, 3000, 4000, 6000GB in ...


3

The performance added to the storage scales with each spindle added. The rotational speed of the drive is the biggest factor, so adding a 10k RPM drive will give more performance (in terms of IO/s in random IO or MB/s in streaming IO) than a 7.2k RPM drive. The size of the drive has virtually no effect. People say small drives go faster simply because you ...


4

I should point out that IOPS are not a great measurement of speed on sequential writes, but lets just go with it. I suspect the seek and write times of disk heads is pretty consistent despite the size of the disks. 20 years ago we we're all using 60GB disks with (roughly - certainly not linearly) the same read/write speeds. I am making an educated guess ...



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