<div class="socmaildefaultfont" dir="ltr" style="font-family:Arial, Helvetica, sans-serif;font-size:9pt" ><div dir="ltr" >I think you need to think about which node the file is being decompressed on (and if that node has plenty of space in the page pool.)</div>
<div dir="ltr" >iirc mmchattr works on one of the 'manager' nodes not necessarily the node you typed the command on?</div>
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<div dir="ltr" > </div>
<div dir="ltr" > </div>
<blockquote data-history-content-modified="1" dir="ltr" style="border-left:solid #aaaaaa 2px; margin-left:5px; padding-left:5px; direction:ltr; margin-right:0px" >----- Original message -----<br>From: Alec <anacreo@gmail.com><br>Sent by: gpfsug-discuss-bounces@spectrumscale.org<br>To: gpfsug-discuss@spectrumscale.org<br>Cc:<br>Subject: [EXTERNAL] [gpfsug-discuss] Spectrum Scale 5 and Reading Compressed Data<br>Date: Wed, Jan 20, 2021 11:10<br> <br><!-- BaNnErBlUrFlE-HeAdEr-start --> <!-- BaNnErBlUrFlE-HeAdEr-end --> <!-- BaNnErBlUrFlE-BoDy-start --> <!-- Preheader Text : BEGIN --> <!-- Preheader Text : END --> <!-- Email Banner : BEGIN -->
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<div dir="ltr" >We have AIX and Spectrum Scale 5.1 and are compressing older data.
<div> </div>
<div>We can compress data at about 10GB/minute and decompress data wicked fast using mmchattr, when a user reads data from a compressed file via application open / read calls.... it moves at about 5MB/s. Normally our I/O pipeline allows for 2400MB/s on a single file read.</div>
<div> </div>
<div>What can we look at to speed up the read of the compressed data, are there any tunables that might affect this?</div>
<div> </div>
<div>As it is now if the backup daemon is backing up a compressed file, it can get stuck for hours, I will go and mmchattr to decompress the file, within a minute the file is decompressed, and backed up, then I simply recompress the file once backup has moved on.</div>
<div> </div>
<div>Any advice on how to improve the compressed reads under AIX would be very helpful.</div>
<div> </div>
<div>Alec</div></div>
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