<html><head><style type="text/css">.style1 {font-family: "Times New Roman";}</style></head><body>Simpler yet, I believe you can just manually set the OST index on which you would like the file to reside.<BR>
<BR>
lfs setstripe -c 1 -i 0 file_on_ost0<BR>
lfs setstripe -c 1 -i 1 file_on_ost1<BR>
...<BR>
<BR>
Shawn<BR>
<BR>
On 4/5/18, 3:42 PM, "lustre-discuss on behalf of Scott Denham" <lustre-discuss-bounces@lists.lustre.org on behalf of sdenham@cray.com> wrote:<BR>
<BR>
>From: John Bent <johnbent@gmail.com><BR>
>To: John Bauer <bauerj@iodoctors.com><BR>
>Subject: Re: [lustre-discuss] varying sequential read performance.<BR>
<BR>
> "I suspect that this OSC is using an OSS that is under heavier load."<BR>
<BR>
> If you want to confirm this, it seems like you could create files with<BR>
> striping parameters such that you have a single file on each OSS. Well, I<BR>
> know you can make stripe=1 so it's only on one OSS but can you<BR>
> control/query on *which* OSS is the stripe? Assuming you can, then you<BR>
> just benchmark performance for each file (i.e. OSS) and you can discover<BR>
> more explicitly whether you have a slow OSS.<BR>
<BR>
We have used Lustre pools in the past for this. They can overlap, so it is <BR>
Possible to create N pools with each pool containing only one OSS. <BR>
<BR>
Scott Denham<BR>
Staff Engineer - Presales at Cray, Inc<BR>
<BR>
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