Discrepancy in 3par CLI for ShowPD and StatPD leading to incorrect Data going to Stor2RRD.

SBarrett

Getting Physical disk information with StatPD in the 3Par CLI shows that my SSDs are listed twice, one entry showing the expected IOPS and one showing next to nothing for activity, It seems the SSDs are served by 2 Backplane Ports within the 3Par. My FC disks are not affected by this. 

This is causing StorSSD to collect the IOPs data for the SSDs incorrectly. Stor2RRD lists the Disks by "Cage Position" listed in ShowPD, but seems to collect the IOPS by ID in StatPD. Given that StatPD can have multiple entries for the same ID, Stor2RRD does not recognise this, and can pull the the wrong info.

Stor2RRD should add the data for lines with the same Disk ID in StatPD in order to be accurate.


An example below of StatPD with multiple lines of data for the same Disk ID.

08:43:52 05/28/2019 r/w   I/O per second      KBytes per sec      Svt ms   IOSz KB       Idle %
    ID        Port       Cur   Avg  Max    Cur    Avg   Max   Cur   Avg  Cur  Avg Qlen Cur Avg
    55       0:0:2   t  1324   922 1324  29258  15522 29258  1.87  0.92 22.1 16.8    1  87  91
    55       1:0:2   t    45    56  109    546    756  1742  0.26  0.27 12.2 13.6    0  99  99
    56       0:0:1   t  1244   908 1244  26239  15064 26239  0.78  0.48 21.1 16.6    0  91  94
    56       1:0:1   t    33    48  112    421    673  1835  0.13  0.14 12.8 14.2    0 100  99

The Above Disks are listed as below in ShowPD. 

Id CagePos Type RPM State     Total     Free A      B      Capacity(GB)
55 3:13:0  SSD  100 normal   456704        0 1:0:2* 0:0:2*          480
56 2:13:0  SSD  100 normal   456704     1024 1:0:1* 0:0:1*          480

Pavel

Hi,

ok, I see it, it is something we see for the first time, we will have to adopt our code.

We will let you know as soon as it is done, thanks for notifying us.

Pavel

Hi,

here are hot fixes, let us know if the problem is resolved.

https://www.stor2rrd.com/download/hp3parperf.pl.gz

-rwxrwxr-x 1 stor2rrd stor2rrd 21113 Jun  4 08:09 bin/hp3parperf.pl

Gunzip it and copy to /home/stor2rrd/stor2rrd/bin (755, stor2rrd owner)

If your web browser gunzips it automatically then just rename it: mv hp3parperf.pl.gz hp3parperf.pl

Assure that file size is the same as on above example

https://www.stor2rrd.com/download/HP3PAR.pm.gz

-rwxrwxr-x 1 stor2rrd stor2rrd 113143 Jun  4 08:09 bin/HP3PAR.pm

Gunzip it and copy to /home/stor2rrd/stor2rrd/bin (755, stor2rrd owner)

If your web browser gunzips it automatically then just rename it: mv HP3PAR.pm.gz HP3PAR.pm

Assure that file size is the same as on above example

SBarrett

Hi Pavel - that looks to have done the trick. Thank you. It now seems to be collecting the Data for duplicate StatPD IDs correctly. Quite a difference in the Drive IO charts now.