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<p class="MsoNormal" style="margin-bottom:12.0pt">“I am not able to specify -o to an existing file.”<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Yes, that’s expected - As with any other setstripe command, you cannot apply it to existing files which already have stripe information. (The exception is files created with LOV_DELAY_CREATE or mknod(), which
do not have striping information until they are written to.)<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">If you instead use lfs setstripe -o to create a file, that should work.<o:p></o:p></p>
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Patrick <o:p></o:p></li></ul>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of "Ms. Megan Larko" <dobsonunit@gmail.com><br>
<b>Date: </b>Friday, November 9, 2018 at 2:20 PM<br>
<b>To: </b>Lustre User Discussion Mailing List <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>Re: [lustre-discuss] Usage for lfs setstripe -o ost_indices<o:p></o:p></span></p>
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<p class="MsoNormal">Responding to A. Dilger (orig e-mail copied below)<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I am not sure what the overall objective is trying to achieve in specifically identifying to which OSTs to write; it was a question from one in our user community. I am not able to specify -o to an existing
file. I have not tried to use the lustrelibapi to specify OST layout during the write.
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I concur that LU-8417 points out a very significant disadvantage to having users employ the -o option to "lfs setstripe" and that using Lustre Pools is a better idea for the file system. (I'm speculating that
perhaps the users themselves want to be able to create such Lustre Pool-like areas and currently only sysadmins may create Lustre Pools. Avoid the middle-man/woman! Smile!)
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Let me get back to my users to better understand what it is that needs to be done causing them to wish to invoke the -o option to "lfs set-stripe".<o:p></o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">megan<o:p></o:p></p>
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<p class="MsoNormal"><br>
A. Dilger wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="border:solid windowtext 1.0pt;padding:0in"><img width="32" height="32" style="width:.3333in;height:.3333in" id="gmail-_x003a_0_19-e" src="cid:~WRD000.jpg" alt="Image removed by sender." name=":0"></span><o:p></o:p></p>
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<h3><span class="gmail-gd">Andreas Dilger</span><span class="gmail-qu"> </span><o:p></o:p></h3>
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<p class="MsoNormal"><span class="gmail-g3">12:51 PM (2 hours ago)</span><o:p></o:p></p>
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<p class="MsoNormal"><span class="gmail-hb">to </span><span class="gmail-g2">Mohr</span><span class="gmail-hb">,
</span><span class="gmail-g2">me</span><span class="gmail-hb">, </span><span class="gmail-g2">Lustre</span><span class="gmail-hb">
</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="border:solid windowtext 1.0pt;padding:0in"><img width="32" height="32" style="width:.3333in;height:.3333in" id="gmail-_x003a_yi" src="cid:~WRD000.jpg" alt="Image removed by sender."></span><o:p></o:p></p>
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<p class="MsoNormal">This is <a href="https://jira.whamcloud.com/browse/LU-8417" target="_blank">https://jira.whamcloud.com/browse/LU-8417</a> "setstripe -o does not work on directories", which has not been implemented yet.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">That said, setting the default striping to specific OSTs on a directory is usually not the right thing to do. That will result in OST imbalance. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Equivalent mechanisms include OST pools (which also allow a subset of OSTs to be used, unlike -o currently does), and has the benefit of labeling files with the pool to find them easier in the future (eg. for migrating out of the pool).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">What is the end goal that you are trying to achieve?<br>
<br>
Cheers, Andreas<o:p></o:p></p>
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