[Lustre-discuss] bad 1.6.3 striped write performance

[Andrei Maslennikov]

Hello Andreas,

I am currently reconfiguring the setup so cannot do these checks immediately.
Will come back on it, hopefully tomorrow.

Greetings - Andrei.

On Nov 26, 2007 7:59 PM, Andreas Dilger <adilger at sun.com> wrote:

> Can you verify that you disabled data checksumming:
>
>         echo 0 > /proc/fs/lustre/llite/*/checksum_pages
>
> Note that there are 2 kinds of checksumming that Lustre does.  The first one
> is checksumming of data in client memory, and the second one is checksumming
> of data over the network.  Setting $LPROC/llite/*/checksum_pages turns on/off
> both in-memory and wire checksums.  Setting $LPROC/osc/*/checksums turns on/off
> the network checksums only.
>
> If checksums are disabled, can you please report if the CPU usage on the
> client is consuming all of the CPU, or possibly all of a single CPU on 1.6.3
> and on 1.6.2?