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<div>Hello folks,</div>
<div>recently I observed that calling every 5 minutes the command "lsscsi -g" on a Lenovo I/O node (a X3650 M5 connected to D3284 enclosures, part of a DSS-G220 system) can seriously compromise the GPFS I/O performance.</div>
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<div>(The motivation of running lsscsi every 5 minutes is a bit out of topic, but I can explain on request).</div>
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<div>What we observed is that there were several GPFS waiters telling that flushing caches to physical disk was impossible and they had to wait (possibly going in timeout).</div>
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<div>Is this something expected and/or observed by someone else in this community ?</div>
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<div>Thanks</div>
<div>Regards,</div>
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<div> Alvise Dorigo<br>
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