Very low speed at RAID 10

[Vitalii]

Noted that system (Win 8.1) started to load for ages. I did some CrystalDisk test, totally disappointed with speed. Here's a screenshot

Any ideas, how can i test, whats wrong with it?

I have 4*WDC WD20EARS in RAID 10, configured in raidXpert.

 

[rgd1101]

raid 10 on what kind of hdd?

 

[Vitalii]

Hm.. a good question, because i don't remember, and Device Manager didnt provide me any valuable info.
However, when i went to check it via AIDA64, it says that the same. Anyway, it says that i have
"Drive #1 - AMD 2X2 Mirror/RAID1 (3725 GB)"
and
"Drive #2 - WDC WD20EARS-00J2GB0 (1863 GB)"

That surprises me, because i have to have only 2*2 Raid10 and that's it.

 

[Vitalii]

Hm.. did reinstalled OS (updated to Win10), got much better results. Are theese numbers fine?
Had noted that Outpost was not transferred to Win10 - probably firewall was a reason, did some background scanning.

 

[Vitalii]

Also, i did disabled Windows Defender, but Task Manager says that Disk C is always in use at 100%, even when i'm doing nothing. How can i diagnose that?

In processes, there's always some OS crap is going on:

 

[Vitalii]

Yea, it was indexing. Disables that crap i never use - got 0% disk activity.
http://www.vistax64.com/tutorials/69564-index-enable-disable.html

 

[Vitalii]

Final Speed test, without indexing and defender. Are the numbers fine?

 

[Vitalii]

I did investigation about that extra drive and figured out (by RaidXpert) that one of the drives drop out from RAID. Rebuild took whole night, but here's latest results.

 

[Vitalii]

For example here, they are using the same drives as i do (i have 4*WDC WD20EARS), but speed is way higher: http://www.sgvulcan.com/2014/11/04/benchmark-comparison-of-intel-rst-raid-and-microsoft-storage-spaces-pool/