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Does difference in percent-used calculation depend on ONTAP versions?

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Applies to

ONTAP 9

Answer

ONTAP 9.3 or earlier and 9.3.1 or later are different calculations.

Additional Information

  • ONTAP 9.3 or earlier calculation of "percent-used"

"percent-used" = (df used  + df snapshot reserve) / (volume size + snapshot reserve)

Example:

"percent-used" = ( 814396 + 4194304) / ( 16777216 +  4194304 ) = 23%

ontap93::> vol show -vserver svm1_ontap93 -volume vol1_svm1 -fields percent-used, total ,used, percent-snapshot-space
vserver         volume    total used    percent-used percent-snapshot-space
--------------- --------- ----- ------- ------------ ----------------------
svm1_ontap93-02 vol1_svm1 16GB  795.3MB 23%          20%
 
ontap93-02::> df -vserver svm1_ontap93-02  -volume vol1_svm1
Filesystem              kbytes       used      avail capacity  Mounted on
/vol/vol1_svm1/     16777216     814396   15962820       5%  /vol1_svm1
/vol/vol1_svm1/.snapshot 4194304    12144    4182160 0%  /vol1_svm1/.snapshot
2 entries were displayed.
 
  • ONTAP 9.3.1 or later calculation of "percent-used" = "df used percent"

Example:

ontap97::> vol show -vserver svm1_ontap97 -volume vol1_svm1 -fields percent-used, total ,used, percent-snapshot-space
vserver      volume    total used   percent-used percent-snapshot-space
------------ --------- ----- ------ ------------ ----------------------
svm1_ontap97 vol1_svm1 4GB   1.57GB 39%          20%
 
ontap97::> df -vserver svm1_ontap97 -volume vol1_svm1
Filesystem              kbytes       used      avail capacity  Mounted on
/vol/vol1_svm1/        4194304 1651144    2543160      39%  /vol1_svm1
/vol/vol1_svm1/.snapshot 1048576    24204    1024372       2% /vol1_svm1/.snapshot
2 entries were displayed.