Does the output of mmdf show that data is evenly distributed across your NSDs? If not that could be contributing to your problem. Also, are your NSDs evenly distributed across your NSD servers, and the NSD configured so the first NSD server for each is not the same one?
Fred
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Fred Stock | IBM Pittsburgh Lab | 720-430-8821
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----- Original message -----
From: "Saula, Oluwasijibomi" <[email protected]>
Sent by: [email protected]
To: "[email protected]" <[email protected]>
Cc:
Subject: [EXTERNAL] [gpfsug-discuss] Client Latency and High NSD Server Load Average
Date: Wed, Jun 3, 2020 5:45 PM
Hello,Anyone faced a situation where a majority of NSDs have a high load average and a minority don't?Also, is 10x NSD server latency for write operations than for read operations expected in any circumstance?We are seeing client latency between 6 and 9 seconds and are wondering if some GPFS configuration or NSD server condition may be triggering this poor performance.
Thanks,Oluwasijibomi (Siji) Saula
HPC Systems Administrator / Information Technology
Research 2 Building 220B / Fargo ND 58108-6050
p: 701.231.7749 / www.ndsu.edu
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