[Lustre-discuss] Problems & partial success on PPC64 (XServe G5) Debian cluster

[Robert Olson]

On Nov 21, 2007, at 4:30 PM, Andreas Dilger wrote:

> On Nov 19, 2007  13:25 -0600, Robert Olson wrote:
>> OK, early indications are good here. Started out with  MDT on PPC  
>> with OST
>> on intel, ran iozone up to 1M files and it finished without error  
>> and with
>> reasonable performance.
>
> Can you please run "e2fsck -fn" (from a Lustre-patched e2fsprogs)  
> on the
> filesystems after your tests.

What will that tell me?


>
> The extents,mballoc options are primarily aimed at improving the  
> performance
> under high load by reducing CPU usage and getting better  
> allocation.  if
> you have mostly small files then the performance difference won't  
> be huge.

is this one of the changes that improves write performance? I've  
notice write performance lagging reads.

I've got the system running with a 7 OSTs, and getting near-wire-rate  
reads from wide stripes to a single node with large files according  
to iozone.

--bob