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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Calibri">I think I was missing a key piece in that I thought that just doing a mmafmctl fs1 prefetch –j cache would start grabbing everything (data and metadata) but it appears that the –list-file
myfiles.txt is the trigger for the prefetch to work properly. I mistakenly assumed that omitting the –list-file switch would prefetch all the data in the fileset.
<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:Calibri;color:black">From: </span>
</b><span style="font-family:Calibri;color:black"><gpfsug-discuss-bounces@spectrumscale.org> on behalf of Venkateswara R Puvvada <vpuvvada@in.ibm.com><br>
<b>Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Date: </b>Thursday, April 6, 2017 at 5:45 AM<br>
<b>To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Subject: </b>Re: [gpfsug-discuss] AFM misunderstanding<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"sans-serif","serif"">Could you explain "bits of actual file" mentioned below ? Prefetch with
</span><span style="font-size:10.0pt;font-family:Calibri">–metadata-only</span><span style="font-size:10.0pt;font-family:"sans-serif","serif"">pulls everything (xattrs, ACLs etc..) except data. Doing "</span><span style="font-size:10.0pt;font-family:Calibri">ls
–ltrs</span><span style="font-size:10.0pt;font-family:"sans-serif","serif"">" shows file allocation size as zero if data prefetch not yet completed on them.</span><br>
<br>
<span style="font-size:10.0pt;font-family:"sans-serif","serif"">~Venkat (vpuvvada@in.ibm.com)</span><br>
<br>
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<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">From: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">Mark Bush <Mark.Bush@siriuscom.com></span><br>
<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">To: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">gpfsug main discussion list <gpfsug-discuss@spectrumscale.org></span><br>
<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">Date: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">04/06/2017 07:24 AM</span><br>
<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">Subject: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">[gpfsug-discuss] AFM misunderstanding</span><br>
<span style="font-size:7.5pt;font-family:"sans-serif","serif";color:#5F5F5F">Sent by: </span><span style="font-size:7.5pt;font-family:"sans-serif","serif"">gpfsug-discuss-bounces@spectrumscale.org</span><o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:Calibri">When I setup a AFM relationship (let’s just say I’m doing RO), does prefetch bring bits of the actual file over to the cache or is it only ever metadata? I know there is a –metadata-only switch but it appears
that if I try a mmafmctl prefetch operation and then I do a ls –ltrs on the cache it’s still 0 bytes. I do see the queue increasing when I do a mmafmctl getstate. I realize that the data truly only flows once the file is requested (I just do a dd if=mycachedfile
of=/dev/null). But this is just my test env. How to I get the bits to flow before I request them assuming that I will at some point need them? Or do I just misunderstand AFM altogether? I’m more used to mirroring so maybe that’s my frame of reference and
it’s not the AFM architecture. </span><br>
<span style="font-size:10.0pt;font-family:Calibri"> </span><br>
<span style="font-size:10.0pt;font-family:Calibri"> </span><br>
<span style="font-size:10.0pt;font-family:Calibri">Mark</span> <o:p></o:p></p>
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