slow brustrate seagate cheetah?

P

PAo_ReVoLT

[H]ard|Gawd
Joined
Apr 4, 2008
Messages
2,036
okay here is the setup

mobo: 780i asus striker 2 formular
raid controller: adaptec 5085 (installed on first slot near CPU 16x lane)
HDD: ST3450856SS x4

raid setup:
raid 0, stripe size: 128k, write thru (battery installed), all drive connected to connector 0

running vista x64 on the drive when doing the benchmark

benchuw5.jpg


question is why my burst rate is so low?
should i installed the drive 2 on first connector and another 2 on second connector?
or is this seem right benchmark to you guys?

thanks in advance
 
I would say this is an issue with HDtune. Your sustianed transfer rate is higher the the burst rate which doesn't make sense at all.


I am not sure how HDtune calculates the burst rate but my guess is thats the problem.



Also make sure you update the firmware on those hurricane drives the initial releases had a bunch of problems.
 
that's what i think so about the HDtune

i tried to download hdtach but it not support vista x64 isn't it?

is there another program i can test with?

ps* lastnight i tried to copy 6x 10GB files from multiple location to difference location (in the same drive) it is still doing well (about 50~70 MB/s)
 
just check my drive all of them running on 0004 firmware is there anything newer?

thx
 
Pao I just ran HDtune on my cheetahs on vista x64 and I get a burst rate lower than my sustained average....I think it is just a problem with how HDtune works.
 
HDTune or really a lot of these programs (okay all of them) dont scale properly with the types of drives used. We are seeing this more and more as enthusiasts are switching to SAS and SSD products.
 
PAo_ReVoLT said:
just check my drive all of them running on 0004 firmware is there anything newer?

thx
Click to expand...



I am on a specifc OEM branch but I would suspect 0004 should be ok. I would just stay away from 0001 or 0002.
 
seem fine so far just have a little bit trouble when installing vista that's all (BSOD 3 times), but installing window 2008 is simple
 
here is ATTO benchmark after 128.0 writing is a lot faster than reading (which is not right to me)

is it something to do with my stripe size?

1jpgkj6.jpg
untitled1vx1.jpg
 
HDtach works fine on vista x64, right click the exe and run in compatibility mode as Xp SP2
 
PAo_ReVoLT said:
here is ATTO benchmark after 128.0 writing is a lot faster than reading (which is not right to me)

is it something to do with my stripe size?

http://img338.imageshack.us/img338/4596/1jpgkj6.jpg
http://img293.imageshack.us/img293/2576/untitled1vx1.jpg
Click to expand...


Your controller is caching those writes. Your disks are not writing that fast. In fact the XOR engine on your adaptec card can't move the data quick. This has nothing to do with the stripe size and everything to do with the test size vs the cache size of the controller.

What you are seeing there is actually a pretty good indication of the burst speed.

If you want to get a better indication of performance get IOmeter.
 
draksia said:
Your controller is caching those writes. Your disks are not writing that fast. In fact the XOR engine on your adaptec card can't move the data quick. This has nothing to do with the stripe size and everything to do with the test size vs the cache size of the controller.

What you are seeing there is actually a pretty good indication of the burst speed.

If you want to get a better indication of performance get IOmeter.
Click to expand...

really?

when i'm copy the file i get about ~500MB/s??

anyway i dont care about Bench anymore as long as it gave me good performance i'm happy
 
another interesting thing to try with ATTO is to increase the queue depth.
A real strength of SAS/SCSI is the ability to process higher queue requests without degradation. Jack up the queue depth to 8 and re-run the test... :)
 
You must log in or register to reply here.
Back
Top