3ware 9550sx Raid question

G

Greg613

n00b
Joined
Apr 6, 2005
Messages
34
Currently have 9550sx-12 raid card on my server. I'm wondering what i'm missing to get maximum performance out of it. Its currently setup with raid 50 with 6 total drives. Here is a post of my speed test:

raido.jpg



My question is that my read speed per request basically appears to be around 70mb for example if i use a program that examins a file it will max out around 70mb /sec. I can open this with 3 sessions running scanning 3 files and it will do them each at about 70mb /sec. Basically 210mb read speed... The same thing happens when I write to the array. I try to write from a raid 0 array to this raid 50 array and it tops out at 70-80 but i write from 3 sperate disk to the raid 50 array and it will do them each at 70mb/sec. Is there some sort of setting that limits each write or read action? Specs posted below of server. Is there some sort of setting in windows that limits write/read speed of arrays because thats what it seems like to me. My overall speed can do writes/reads of 200+mb. Let me know what you think


Windows 7 64bit
3WARE 9550SX-12 raid 50
6x wd green drives
SUPERMICRO MBD-X7SBE
Q6600 CPU
4gb ram
 
ran IOmeter 512k seq write / read and I got 121mb read speed max and 50 write speed max

Here is the picture of when I was writing 3 hdds to my raid and the speed I got.

writespeed.jpg



So anyone know if this is something OS dependant. I verified write cache is on and the raid is not degraded or anything like that. I need some more stuff to try.
 
I would not do raid 50 with only 6 drives. You have 2 raid 5s of 3 drives in raid 0. raid5 with only 3 drives is not the best performer.
 
ok i'm migrating to raid 5 with 7 1tb hdds anyone else have any ideas I will post results after this is complete
 
I agree with drescherjm. If you're looking for performance + redundant you'll want raid5 plain raid5. Raid50 is geared towards business class applications where there is random IO

What stripe size did you set for the array?

You should be able to see 150MBps+ (don't have that second parity that needs to be maintained) reads with 7 drives as long as you are not on PCI but alot of that is dependent on the application you are using for benchmarking...
 
I have that same card in my server, it's PCI-x, not PCI or PCIe. I get about 100MB/s on my 5 disk RAID 5 array with 1.5 TB WD GP drives.
 
My system board is listed above and has pci-x 133 slot which is what the card is. Its currently at 8% migrated, its gonna take couple days to complete. The stripe size is set to 256 I believe.
 
You must log in or register to reply here.
Back
Top