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тАО03-09-2008 07:24 AM
тАО03-09-2008 07:24 AM
I've a pretty new ML350 G5 with a P400 raid card with 256 BBWC and an array of four disks in raid5.
I'm not expecting too much from this controller, but i'd like to know what are the performance normally you should get with configuration.
I'm running linux with the latest kernel and ext3 as main filesystem.
Now with a sequential write i get almost 90mb/s (according to dd).
Is there some ways to tune this card?
Thanks
Pier
Solved! Go to Solution.
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тАО03-10-2008 05:23 AM
тАО03-10-2008 05:23 AM
Re: P400 performance
Have you tried tuning with the Array Configuration Utility ? U can tune the Array Accelerator using ACU.
Hope you have installed Proliant Support Pack after the OS installation.
If not you can download the latest PSP and install it.
What distro are u running ?
Regards,
Shiraj.
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тАО03-10-2008 08:24 AM
тАО03-10-2008 08:24 AM
Re: P400 performance
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тАО03-10-2008 11:40 AM
тАО03-10-2008 11:40 AM
Re: P400 performance
I tried differente stripe sizes and as far as i know i cannot manage the write/read cache performance.
As i see from acu, ncq is enabled.
On the OS side, i tried many things...the fs is alligned with the stripe size and i'm using lvm on it. I tried many tuning with different io schedeler and other small tunings.
All the result don't differ too much...all are between 85-90 MB/s. Is this the limit of this controller? A similar configuration with 3ware i get more than double performance and with areca i get even more.
Thanks for the help.
Pier
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тАО03-10-2008 11:45 AM
тАО03-10-2008 11:45 AM
Re: P400 performance
Pier
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тАО03-10-2008 12:02 PM
тАО03-10-2008 12:02 PM
Re: P400 performance
what type of disks do you use?
RAID 5 suffers under a phenomenon called "write penalty". The write penalty is the overhead which arises if a block is written. A logical write is divided into two logical reads and two logical write. So while doing a write IO you can only get 25% of the possible IOPS. If you're using 15k disks, each disk achieves approx 200 IOPS. So your four disks can do up to 800 IOPS while doing 100% read. Doing a write IO you can get only 200 IOPS. That is only that, what a disk can physically do. According to that a short formula:
MB/s = IOPS x transfer size
Doing 4 KB IOPS you can get only round about 800 KB/s while doing a write IO on that four disk RAID 5.
That's all theory. The RAID is supported by cache, a intelligent controller... etc.
What I'm trying to say:
Cache and a fast controller is one thing. The right RAID Level for the right application is the other thing. Doing heavy write I/Os with a RAID 5 is... mmmhh... unwise. ;)
90 MB/s with a four disks RAID 5 is quite good. If you want more performance, try RAID 1+0. But remember: RAID 5 usable capacity = n disks -1. RAID 1+0 = n disks /2. You get the same usable capacity, you need 6 disks, not 4.
Hope this helps.
Best regards,
Patrick
Patrick
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тАО03-10-2008 01:02 PM
тАО03-10-2008 01:02 PM
Re: P400 performance
Well...that was a nice explanation...i've read about that write penalty about raid5 writing.
But i was not suspecting that was so bad...i mean i always worked with some bigger raid 5 arrays (14-16 disks) and the performance were (actually still are) pretty good.
Now i know that if i want performance i can go with raid 1+0.
The last question: adding one more disk is worthing in gain of performance or it's better to keep it as spare disk (as i thought to do at the beginning)?
Thank everybody for the help.
Pier
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тАО03-10-2008 06:27 PM
тАО03-10-2008 06:27 PM
Re: P400 performance
to add a little bit more of info start reading from page 77
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c00729544/c00729544.pdf
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тАО03-10-2008 11:45 PM
тАО03-10-2008 11:45 PM
Solutionsimple answer: More disks = more IOPS. But for the same rate of write IOPS in a RAID 5 you need much more disks then in a RAID 1.
Two links that are maybe interesting for you (sorry, only in german):
http://www.blazilla.de/index.php?/archives/270-MBs-vs.-IOPS.html
http://www.blazilla.de/index.php?/archives/269-IOPS-Kalkulation.html
Don't forget to assign points. ;)
Hope this helps.
Best regards,
Patrick
Patrick
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тАО03-11-2008 12:07 AM
тАО03-11-2008 12:07 AM
Re: P400 performance
Those links were very helpful.
For german no problem, ich kann noch ein bisschen deutsch verstehen ;-) (i hope i wrote it right :-))
Pier