2650 local RAID Disk Performance

[Carlos Antunes]

I also get around 20MB/s for RAID 5 and around 50MB/s for RAID 1.

Andrey Dmitriev wrote:
> Looks like Write Cache was disabled..
> Now getting about 20-21Megs/sec... Still slow in my book.
>
> root at mt-mail1 ~]# time dd if=/dev/zero of=/var/10g.file bs=8192 
> count=1310720 
>
> 1310720+0 records in 
> 1310720+0 records out 
>
> real    8m32.544s 
> user    0m1.029s 
> sys     1m15.292s 
> [root at mt-mail1 ~]# 
> [root at mt-mail1 ~]# time dd if=/dev/zero of=/var/10g.file bs=65536 
> count=163840 
> 163840+0 records in 
> 163840+0 records out 
>
> real    8m4.661s 
> user    0m0.199s 
> sys     1m14.062s 
>
>
>
> -----Original Message-----
> From: Andrey Dmitriev 
> Sent: Wednesday, July 18, 2007 4:33 PM
> To: linux-poweredge at dell.com
> Subject: 2650 local RAID Disk Performance
>
> We have a Dell poweredge 2650 with either 5 in RAID5.
>
> It's running redhat 4 update 5.
>
> I did some basic dd tests with 8K block size, and couldn't see anything 
> higher than 14.3megs per second sustained.
>
> Is this normal? We have a 2950 with 15K SAS drives, and that thing just 
> screams with around 150Megs per second... I am not expecting such high 
> numbers out of an older system, but 40-60Megs would be more acceptable 
> to me.
>
>
> [root at mt-mail1 ~]# time dd if=/dev/zero of=/var/10g.file bs=8192 
> count=1310720 
> 1310720+0 records in 
> 1310720+0 records out 
>   
> real    11m53.161s 
> user    0m0.881s 
> sys     1m11.398s
>
> [root at mt-mail1 ~]# time dd if=/dev/zero of=/var/10g.file bs=131072 
> count=81920 
> 81920+0 records in
> 81920+0 records out
>
> real    11m42.366s
> user    0m0.099s
> sys     1m11.232s
>
>
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