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<div>Short answer: You're looking in the wrong place. What you're looking at is the policy that the file was created under. For the actual details of the first offset in the file, look at objects[0].l_ost_idx.</div>
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<div>-Ben Evans</div>
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<span style="font-weight:bold">From: </span>lustre-discuss <<a href="mailto:lustre-discuss-bounces@lists.lustre.org">lustre-discuss-bounces@lists.lustre.org</a>> on behalf of John Bauer <<a href="mailto:bauerj@iodoctors.com">bauerj@iodoctors.com</a>><br>
<span style="font-weight:bold">Date: </span>Saturday, April 30, 2016 at 4:45 PM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>" <<a href="mailto:lustre-discuss@lists.lustre.org">lustre-discuss@lists.lustre.org</a>><br>
<span style="font-weight:bold">Subject: </span>[lustre-discuss] llapi_file_get_stripe() and lmm_stripe_offset<br>
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<p>I have noticed some inconsistencies in the <b>lfs setstripe/getstripe </b>commands and
<b>llapi_file_get_stripe(</b>) function. Notice in the lfs setstripe/getstripe example below that specifying 7 for the offset with lfs setstripe -i 7 results in lfs getstripe reporting lmm_stripe_offset=7. That all looks good. But the simple program below
that calls <b>llapi_file_get_stripe() </b>and prints out the <b>lmm_XXX</b> values reports
<b>lmm_stripe_o</b><b>ffset</b><b>=0</b>. Doesn't seem right.<br>
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<font face="Courier New,Courier,monospace">% lfs setstripe -c 4 -i <b><font color="#ff0000">7</font></b> file.dat<br>
% lfs getstripe file.dat<br>
file.dat<br>
lmm_stripe_count: 4<br>
lmm_stripe_size: 1048576<br>
lmm_pattern: 1<br>
lmm_layout_gen: 0<br>
lmm_stripe_offset: <b><font color="#ff0000">7</font></b><br>
obdidx objid objid group<br>
7 5611546 0x55a01a 0<br>
0 5607846 0x5591a6 0<br>
8 5612725 0x55a4b5 0<br>
16 5611434 0x559faa 0</font><br>
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<p>But whenever I call llapi_file_get_stripe(), the value <b>lmm_stripe_offset</b> that is returned in the
<b>struct lov_user_md</b> is always 0.</p>
<p><font face="Courier New,Courier,monospace"><br>
% <b>./main.exe file.dat</b><br>
0=llapi_file_get_stripe()<br>
lmm_stripe_count=4<br>
lmm_stripe_size=1048576<br>
lmm_pattern=1<br>
lmm_layout_gen=0<br>
<font color="#ff0000">lmm_stripe_offset=0</font><br>
% <b>cat main.c</b><br>
#include <stdlib.h><br>
#include <stdio.h><br>
#include <string.h><br>
<br>
#include "lustre/lustre_user.h"<br>
<br>
main(int argc, char **argv){<br>
if( argc < 2 ) return -1 ;<br>
char *fileName = argv[1] ;<br>
struct lov_user_md_v3 lum ;<br>
memset( &lum, 0, sizeof(lum) ) ;<br>
int status = llapi_file_get_stripe(fileName, &lum);<br>
fprintf(stderr,"%d=llapi_file_get_stripe()\n",status);<br>
if( status != 0 ) return -1 ;<br>
fprintf(stderr,"lmm_stripe_count=%d\n",lum.lmm_stripe_count);<br>
fprintf(stderr,"lmm_stripe_size=%lld\n",lum.lmm_stripe_size);<br>
fprintf(stderr,"lmm_pattern=%d\n",lum.lmm_pattern);<br>
fprintf(stderr,"lmm_layout_gen=%d\n",lum.lmm_layout_gen);<br>
fprintf(stderr,"lmm_stripe_offset=%d\n",(int)lum.lmm_stripe_offset);<br>
exit(0);<br>
}<br>
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<pre class="moz-signature" cols="72">--
I/O Doctors, LLC
507-766-0378
<a class="moz-txt-link-abbreviated" href="mailto:bauerj@iodoctors.com">bauerj@iodoctors.com</a></pre>
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