Lustre discuss - May 2006 - How to restrict a stripe to a subset of theavailable OSTs?

On Thu, 2006-04-20 at 14:18 -0400, Peter J. Braam wrote:
> This has been voted a top feature to have.  It will probably hit 1.6.  I am
nervous about a quick hack here because we''ll get a new stripe type on
the disks  better get it right.
>  
> 
> Lee  disabling the full osts on the mds allows you to avoid them for new
files today.
Ok. Thanks. No need for a quick hack. My immediate need is only for
testing purposes. I''ll work around it. Was just hoping I was wrong or
lost.

		--Lee
> 
> -----Original Message-----
> From: "Lee Ward" <lee@sandia.gov>
> To: "lustre-discuss@clusterfs.com"
<lustre-discuss@clusterfs.com>
> Sent: 4/20/06 12:27 PM
> Subject: [Lustre-discuss] How to restrict a stripe to a subset of
theavailable OSTs?
> 
> Hi,
> 
> Is there any way for an application to set which particular OSTs should
> be involved in a stripe? I''ve found how to set size, count, and
offset.
> It appears, though, that the ll_lov_setstripe routine in
> lustre/llite/file.c will only copy in the bytes for the lov_user_md
> structure and not any lov_user_ost_data records. Am I reading the code
> correctly? Is there, perhaps, some other way to accomplish this?
> 
> Thanks in advance.
> 
> 		--Lee
> 
> 
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss@clusterfs.com
> https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
> 
>

This has been voted a top feature to have.  It will probably hit 1.6.  I am
nervous about a quick hack here because we''ll get a new stripe type on
the disks  better get it right.

Lee  disabling the full osts on the mds allows you to avoid them for new files
today.

-----Original Message-----
From: "Lee Ward" <lee@sandia.gov>
To: "lustre-discuss@clusterfs.com"
<lustre-discuss@clusterfs.com>
Sent: 4/20/06 12:27 PM
Subject: [Lustre-discuss] How to restrict a stripe to a subset of theavailable
OSTs?

Hi,

Is there any way for an application to set which particular OSTs should
be involved in a stripe? I''ve found how to set size, count, and offset.
It appears, though, that the ll_lov_setstripe routine in
lustre/llite/file.c will only copy in the bytes for the lov_user_md
structure and not any lov_user_ost_data records. Am I reading the code
correctly? Is there, perhaps, some other way to accomplish this?

Thanks in advance.

		--Lee


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