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View Full Version : Raid-1 on gb 965p ds3 - help

Omarko
05-08-2008, 06:03 PM
hi guys

I have got myself couple single platter 320GB - HD322HJ hard drives for my server intending to run them in RAID-1 on my Gigabyte 965P DS3 mobo.

The mobo has 6 ports, 4 yellow and 2 purple. The two purple ones are the only ones that support raid.

I hooked up the two drives to it, set the option to IDE/RAID in BIOS and set up the array (64k stripe).

All ok, once booted into windows, drive was detected and the gb raid manager reports everything is ok.

the drives on their own deliver approx 95mb/s sustained transfer rate according to HD Tach.

Problem is, that in raid-1 , where you would expect doulbe the read rates (similiar to raid-0) I only get read rate of around 95mb/s ? why would that be ? I thought that RAID-1 reads stripes from each of the drives .... thus making the speed similiar to RAID-0.

(results of these drives can be found www.xtremesystems.org/fo...78045&page=8 and it clearly shows that something is wrong with my setup).

any help is much appreciated !

cheers
NapalmV5
05-08-2008, 08:04 PM
nothing wrong

single = raid1 performance
raid1 = single performance
Omarko
05-08-2008, 08:11 PM
I thought that RAID-1 still reads stripes from EACH drive ... :(

oh well ... if thats not the case .. I will have to accept what it is ...

I guess I was just hoping for some easy miracle advice like a driver or switch :(

cheers
Omarko
05-08-2008, 10:14 PM
also, why does it keep resynching after every reboot ? its takes like 60 minutes to do ....

:(

is it because the onboard raid is crap ?

cheers
Buffalo2102
05-13-2008, 10:03 AM
Sorry, I can't solve your problem but I have two Samsung drives in RAID 1 using the same mobo (purple ports) and do not have the issues you describe. No problems at all actually.
Omarko
05-13-2008, 01:54 PM
Sorry, I can't solve your problem but I have two Samsung drives in RAID 1 using the same mobo (purple ports) and do not have the issues you describe. No problems at all actually.

hi there

I managed to fix the constant resynching problem, had to install latest raid manager software and all is good now.

can you please post a HDtach from your setup?

here is my raid-1 result:

http://img247.imageshack.us/img247/9813/picture1ji4.th.png (http://img247.imageshack.us/my.php?image=picture1ji4.png)
Serra
05-13-2008, 02:25 PM
I thought that RAID-1 still reads stripes from EACH drive ... :(

oh well ... if thats not the case .. I will have to accept what it is ...

I guess I was just hoping for some easy miracle advice like a driver or switch :(

cheers

Well, let's put it this way... it's not the case with any controller I've seen for single read jobs, but it is technically allowable in the RAID-1 specification.

Think of it this way. A controller has a few options as to how it wants to do reads:
1. Always read from only one disk (worst case scenario)
2. Read from disk 1 for the first read, disk 2 for the second, etc. (some optimizations can take place in here)
3. Always use both disks for each read job

Many controllers prefer to use #2, though some still use option #1 (including some of the bigger brand names, sadly). The reason to go with #2 is improving multi-file performance, which you may be more likely to see used in setups which require RAID-1.