[Pvfs2-users] NFS trouble

[Sam Lang]

Hi Murali,

I'm confused about something.  If Emmanuel is just using cp and mv,  
why are there multiple segments in the iovec?

Thanks,
-sam

On Sep 21, 2007, at 9:08 AM, Murali Vilayannur wrote:

> Emmanuel,
> THat case hasn't been implemented unfortunately..It proved to be a
> little bit more
> complicated at the time I wrote it..
> I did not realize that there is a need or use case for nr_segs > 1.
> Hmm. Until we get the fully correct solution,
> one temporary kludge is to open pvfs2-config.h and comment out the  
> line
> #define HAVE_COMBINED_AIO_AND_VECTOR 1
> and then rebuild the kernel module (using make kmod)
> Hope this works,
> thanks,
> Murali
>
>
>
> On 9/20/07, Emmanuel Florac <eflorac at intellique.com> wrote:
>>
>> Hello,
>> I've built a small PVFS2 cluster and it works fine -- mostly...
>>
>> Here is the basic cluster setup : 2 dual core Xeon machines, 2GB
>> RAM, 2 TB disks as server nodes. Running Debian Etch with a custom
>> 2.6.20.7 SMP kernel built from kernel.org vanilla source.
>> I compiled PVFS 2.6.3, with the 2.6.21 patch applied (it wouldn't
>> compile as is).
>>
>> PVFS2 works just fine, local performance is OK.
>> I'd need to share the PVFS2 filesystem thru NFS to some clients.
>> Reading just works, however writing constantly fails with this  
>> error :
>>
>> Sep 19 18:36:53 triangle
>> kernel: /usr/sarge64/usr/src/pvfs-2.6.3/src/kernel/linux-2.6/file.c
>> line 1923: pvfs2_file_aio_write_iovec: not implemented yet (aio  
>> with 7
>> segments)
>>
>> Then the file created is either of zero size, or filled with 0x00.
>>
>> I've tried many configurations : sharing from a PVFS2
>> both server and client node, from a PVFS2 client-only node, with
>> uniprocessor and smp kernel, forced NFS version 2, no luck.
>>
>> Writing thru CIFS (Samba), FTP, scp works perfectly.
>>
>> I tentatively edited the file.c source code by commenting out the  
>> test
>> that spits the error out. With this modified kernel module, writing
>> thru NFS works _most_of_the_time_. It fails apparently randomly from
>> time to time while writing big files ( 500MB to 1GB).
>>
>> Any help would be greatly welcomed....
>>
>> --
>> ----------------------------------------
>> Emmanuel Florac     |   Intellique
>> ----------------------------------------
>>
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