On 2013-03-30 21:29 (GMT-0700) Linda Walsh composed:
Felix Miata wrote:
On 2013-03-30 23:38 (GMT+0100) Carlos E. R. composed:
Once I partitioned a disk in 20 or 30 partitions, and tested speed on all of them. The faster region was about 1/3 of the disk. It was slower at the end of the disk than at the start; that I expected, but not that it would be faster at 1/3.
Confirmed via observation here, closer maybe to 25%, but clearly slower at the front than somewhat beyond the front, with the rear very clearly bringing up the rear in performance. It wouldn't surprise me if disk makers were putting LBA 0 somewhere other than the physical start. ==== Someone should go tell Tom's HW to update their graphs... Never seen one with a slower speed at the start...
#1 on http://fm.no-ip.com/PC/bench/Sysbench/resul603.txt looks like the only such doc I saved. Note on its #2 the difference between front and middle is very small. All others I checked at http://fm.no-ip.com/PC/bench/Sysbench/ are fastest at front. Most of these were done shortly after receiving a new HD, prompting to test to see what speed to expect. ISTR seeing it happen more than once though. Otherwise I don't think I'd have remembered it ever happening.
That doesn't make any sense unless you have bad sectors there... or maybe they are putting spare sectors at the outside on some disks?
I've never encountered those symptoms on any drives I've benched, but also I'm almost always running Enterprise drives for reliability. Same for your tests? Brands? I'm usually Hitachi, Fujitsu, Others are not ones I usually buy but have some...course now Hitachi is WD? ARG...wonder if they'll keep the facilities separate...never had good luck with WD's...
Until the past year I had only ever bought WD twice, and one wasn't for any system of my own. Now the choices are just too limited not to consider WD. The last I bought was a 512 byte/sector HD155UI "refurb" 1.5T made in a Samsung factory several years ago but with Seagate on the label. -- "The wise are known for their understanding, and pleasant words are persuasive." Proverbs 16:21 (New Living Translation) Team OS/2 ** Reg. Linux User #211409 ** a11y rocks! Felix Miata *** http://fm.no-ip.com/ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org