Hello, I'm using mmperfmon to get writing stats on NSD during a write activity on a GPFS filesystem (Lenovo system with dss-g-2.0a).
I use this command: # mmperfmon query 'sf-dssio-1.psi.ch|GPFSNSDFS|RAW|gpfs_nsdfs_bytes_written' --number-buckets 48 -b 1 to get the stats. What it returns is a list of valid values followed by a longer list of 'null' as shown below: Legend: 1: sf-dssio-1.psi.ch|GPFSNSDFS|RAW|gpfs_nsdfs_bytes_written Row Timestamp gpfs_nsdfs_bytes_written 1 2018-11-15-16:15:57 746586112 2 2018-11-15-16:15:58 704643072 3 2018-11-15-16:15:59 805306368 4 2018-11-15-16:16:00 754974720 5 2018-11-15-16:16:01 754974720 6 2018-11-15-16:16:02 763363328 7 2018-11-15-16:16:03 746586112 8 2018-11-15-16:16:04 746848256 9 2018-11-15-16:16:05 780140544 10 2018-11-15-16:16:06 679923712 11 2018-11-15-16:16:07 746618880 12 2018-11-15-16:16:08 780140544 13 2018-11-15-16:16:09 746586112 14 2018-11-15-16:16:10 763363328 15 2018-11-15-16:16:11 780173312 16 2018-11-15-16:16:12 721420288 17 2018-11-15-16:16:13 796917760 18 2018-11-15-16:16:14 763363328 19 2018-11-15-16:16:15 738197504 20 2018-11-15-16:16:16 738197504 21 2018-11-15-16:16:17 null 22 2018-11-15-16:16:18 null 23 2018-11-15-16:16:19 null 24 2018-11-15-16:16:20 null 25 2018-11-15-16:16:21 null 26 2018-11-15-16:16:22 null 27 2018-11-15-16:16:23 null 28 2018-11-15-16:16:24 null 29 2018-11-15-16:16:25 null 30 2018-11-15-16:16:26 null 31 2018-11-15-16:16:27 null 32 2018-11-15-16:16:28 null 33 2018-11-15-16:16:29 null 34 2018-11-15-16:16:30 null 35 2018-11-15-16:16:31 null 36 2018-11-15-16:16:32 null 37 2018-11-15-16:16:33 null 38 2018-11-15-16:16:34 null 39 2018-11-15-16:16:35 null 40 2018-11-15-16:16:36 null 41 2018-11-15-16:16:37 null 42 2018-11-15-16:16:38 null 43 2018-11-15-16:16:39 null 44 2018-11-15-16:16:40 null 45 2018-11-15-16:16:41 null 46 2018-11-15-16:16:42 null 47 2018-11-15-16:16:43 null 48 2018-11-15-16:16:44 null If I run again and again I still get the same pattern: valid data (even 0 in case of not write activity) followed by more null data. Is that normal ? If not, is there a way to get only non-null data by fine-tuning pmcollector's configuration file ? The corresponding ZiMon sensor (GPFSNSDFS) have period=1. The ZiMon version is 4.2.3-7. Thanks, Alvise
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