extremely slow write performance plaintext

[Cory Coager]

On 01/25/2011 01:21 AM, Michael Monnerie wrote:
> You're getting 40MB/s write speed and says that's fine? I get more
> performance from a single SATA desktop drive. Your setup seems to suck
> extremely somewhere.
>
> It already starts with your dd speed. I started it on a virtualized VM
> on an old, overloaded server and get:
>
> # dd if=/dev/zero of=test.dd bs=1k count=1M
> 1048576+0 Datensätze ein
> 1048576+0 Datensätze aus
> 1073741824 Bytes (1,1 GB) kopiert, 10,9992 s, 97,6 MB/s
>
> This is a hardware RAID 6 with just 8x 10krpm WD SATA drives. Try to
> look into general I/O problems. Maybe you can try to boot from an actual
> linux CD with kernel>2.6.30 to see if that helps performance.
>
> Maybe one or more disks in your array are dead and the controller is
> crying for replacement?
I just checked the array configuration utility, no drives are dead.  
Unfortunately this server is in production and I am not physical next to 
the machine so I won't be able to test with a LiveCD.



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