CrystalDiskMark showing faster than disk drive can do ?

[mkivST]

Hi there, 

Hope someone can enlighten me what the problem is here.

Server ML350 G9
6 x HP 600GB 6G SAS 10k rpm SFF HDD (653957-001)

Drive rated at 750 MB/s
I have been trying to upload a pic but always returned permission denied. Not sure what's wrong here. 

Uploading HP_Speed.jpg resulted in the following error: Permission Denied

So i will just type the CrystalDiskMark result below:

SEQ1M Q8T1  Read - 6951.86    Write - 4655.62
SEQ1M Q1T1   Read - 3130.94    Write - 2990.10
RND4K Q32T1  Read - 560.18    Write - 515.79
RND4K Q1T1    Read - 117.00    Write - 105.75

Say 6 of those drives configured in Raid 0, equivalent to 750MB x 6 = 4500 MB/s max possible speed. 

Can someone please educate me what part of mine is wrong ? 

Thanks.
L

[Suman_1978]

Hi,

CrystalDiskMark being a non-hpe product, it may not show proper readings (I personally have not tested this software on hpe drives).

Hence cannot comment more on this benchmarking software.  https://crystalmark.info/en/software/crystaldiskmark/

Thank You!
https://support.hpe.com/hpesc/public/home

[KevinSpringPM]

That typically means you're hitting some kind of cache instead of the drive itself. This could be an OS cache or the physical cache on an HPE smart array controller.

[kat3499]

same here. mee too need education for this . if you found some proper knowledge about this, then please ping me for that also.