File system usage exceeded threshold

Question & Answer

Question

I am getting an alert email from event manager indicating "File system usage exceeded threshold". What does that mean and what are the thresholds?

Cause

The sysmgr will routinely check for OS file system percent used against system-configured thresholds.

Answer

There are 3 stages of the file system usage check with corresponding reason codes. The event is logged in eventmgr.log and will show the reason code.

STAGE 1
This comes with reason code 1051. It will check the host file systems and report when file system usage exceeded 80%

The 'errString' will be:
"File system usage exceeded threshold, reasonCode=1051"

STAGE 2
This comes with reason code 1061. It will check the host file systems and report when file system usage exceeded 90%

The 'errString' will be:
"File system usage exceeded threshold, reasonCode=1061"

STAGE 3
This has no reasonCode given, and the threshold is 95%. If you are hitting this threshold, the Netezza system will not be able to start until the space are clean-up.

The 'errString' will be:
"File system /nz usage exceeded 95 threshold on rack1.host1 System will be stopped"

The default configured file system threshold settings:

$ nzsystem showregistry | grep -i hostFileSystemUsage
sysmgr.hostFileSystemUsageThresholdOneToRiseEvent = 80
sysmgr.hostFileSystemUsageThresholdTwoToRiseEvent = 90
sysmgr.hostFileSystemUsageThresholdToStopSystem = 95

NOTE: The file system might over the threshold and later go back down to normal.

Here are the sample output of 'nzstats -type hostfilesystem'.
(Check is against the last column : "% Used Space")

$ nzstats -type hostfilesystem

Host FS Device Name Mount Point  Space        Free Space  Used Space   % Used
ID   ID                                                                Space
---- -- ----------- ------------ ------------ ----------- ------------ -------
   1  1 /dev/sda5   /             15414932 KB  3026900 KB  12388032 KB 80.36 %
   1  2 /dev/sda9   /tmp           7703876 KB  3168116 KB   4535760 KB 58.88 %
   1  3 /dev/sda8   /usr           7703876 KB  6656868 KB   1047008 KB 13.59 %
   1  4 /dev/sda11  /usr/local     3851896 KB  1888812 KB   1963084 KB 50.96 %
   1  5 /dev/sda7   /var           7703876 KB  7410220 KB    293656 KB  3.81 %
   1  6 /dev/sda6   /opt           7703876 KB  6627528 KB   1076348 KB 13.97 %
   1  7 /dev/sda3   /export/home  15414964 KB   399840 KB  15015124 KB 97.41 %
   1  8 /dev/sda2   /nz          144479444 KB 30974852 KB 113504592 KB 78.56 %
   1  9 /dev/sda1   /boot           966600 KB   920560 KB     46040 KB  4.76 %
   1 10 none        /dev/shm      79990784 KB 74763516 KB   5227268 KB  6.53 %

*Cross-reference information*
Product	Component	Platform	Version
PureData System for Analytics N3001-001	PureData System for Analytics	Platform Independent	All Versions
PureData System for Analytics N3001-002	PureData System for Analytics	Platform Independent	All Versions
PureData System for Analytics N3001-005	PureData System for Analytics	Platform Independent	All Versions
PureData System for Analytics N3001-010	PureData System for Analytics	Platform Independent	All Versions
PureData System for Analytics N3001-020	PureData System for Analytics	Platform Independent	All Versions
PureData System for Analytics N3001-040	PureData System for Analytics	Platform Independent	All Versions

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Document Information

More support for:
PureData System for Analytics N3001-001

Component:
PureData System for Analytics

Software version:
All Versions

Document number:
241961

Modified date:
01 February 2023

UID

swg21667431

IBM Support

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