[pnfs] how mds export pnfs dir to client

[Zhang Jingwang]

I think you should export the dir on DS as normal NFS, but I'm not sure either.

2010/1/18 Arthur Wang <wangjihai at huawei.com>:
> Thank you very much.  It effect after upgrade nfs tools with pnfs-utils.   MDS can recognize  'pnfs' option,  but i am not sure whether i should add 'pnfs'  to
> /etc/exports of DS,  or DS export dir as normal NFS ?
>
>
> Arthur Wang
> Research Department, CPD
> Huawei Technologies Co., Ltd.
> Phone: 86-755-28976096
> Email: wangjihai at huawei.com
> 2010-01-18
>
>
>
> Sender： Zhang Jingwang
> Send time： 2010-01-14  23:02:50
> Receiver： Arthur Wang
> Copyto： pnfs; zhouwei51703
> Topic： Re: [pnfs] how mds export pnfs dir to client
>
> Maybe you should add 'pnfs' in /etc/exports of MDS. Like that:
> /mnt/spnfs     *(rw,fsid=0,no_root_squash,sync,no_subtree_check,pnfs)
> If your exportfs don't recognize this option, you should download the
> latest pnfs-utils.
> It's required for blocklayout pnfs export, I think it may be required
> for file layout too.
> 2010/1/14 Arthur Wang <wangjihai at huawei.com>:
>> Hello,
>> I encounter an export problem when use PNFS, the env is
>> linux-pnfs-2.6.32(2009-12-29), layout is file, detail is as follows:
>> first, export DS to MDS,? edit "/etc/exports " on DS to add this line:
>> /mnt/disk01?????*(rw,no_root_squash,async,no_subtree_check)
>> second, export MDS to Client, edit "/etc/exports " on MDS to add this line:
>> /mnt/spnfs?????*(rw,fsid=0,no_root_squash,sync,no_subtree_check)
>> At last, Client mount MDS to local dir.
>>
>> After those finish,? write file to pNFS through client.?? on DS, i use
>> "tcpdump?src " command to check where the net packets are from, and find
>> that all the data are from MDS to DS.? that means: all the data flow from
>> Client->DS->MDS.? i suppose it is? wrong way that the data goes, and correct
>> way should be that, Metadata is from Client to MDS,? and file data is from
>> Client to DS, is it right?
>>
>> After debug the MDS code , i found that in function nfsd4_layout_verify(),
>> the follows line?execute:
>> if?(exp->ex_pnfs?==?0?||?!sb->s_pnfs_op?||?!sb->s_pnfs_op->layout_type)?{
>> dprintk("%s:?Underlying?file?system?"
>> "does?not?support?pNFS\n",?__func__);
>> goto?out;
>> }
>>
>> My question is: Did i setup pNFS wrong, why all the file data goes through
>> MDS,? and how to let?data directly goes to DS. i suppose it need to let
>> "exp->ex_pnfs?==?0 " not be true above?code.
>>
>>
>> Arthur Wang
>>
>> Research Department, CPD
>>
>> Huawei Technologies Co., Ltd.
>>
>> Phone: 86-755-28976096
>>
>> Email: wangjihai at huawei.com
>>
>>
>>
>> 2010-01-14
>> ________________________________
>>
>>
>> 2010-01-14
>> ________________________________
>>
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> --
> Zhang Jingwang
> National Research Centre for High Performance Computers
> Institute of Computing Technology, Chinese Academy of Sciences
> No. 6, South Kexueyuan Road, Haidian District
> Beijing, China
>



-- 
Zhang Jingwang
National Research Centre for High Performance Computers
Institute of Computing Technology, Chinese Academy of Sciences
No. 6, South Kexueyuan Road, Haidian District
Beijing, China