topic Re: DFM Agg Used Size vs. Physical Used Size in Active IQ Unified Manager Discussions

DFM Agg Used Size vs. Physical Used Size

armandol — Thu, 05 Jun 2025 07:23:32 GMT

The following graphs are from Operations Manager 3.8

Is there a resource or document that explains the values in the graphs below. I am trying to determine the difference in the aggregate "used" column

of the Aggregate Space Availability graph from the aggregate "Physical Used" space in the column of the Aggregate Space Savings graph.

I need to know why the aggregate used space is different than the aggregate physical used space. I need to provide an explanation as to why the total aggregate

size (excluding aggr0) used in graph 1 does not add up to the physical size used in graph 2.

All help is greatly appreciated.

Thanks in Advance

Re: DFM Agg Used Size vs. Physical Used Size

raja — Wed, 30 Sep 2009 18:51:49 GMT

Hi,

"Used" is the capacity usage of the aggregate as reported by ONTAP "df" command.

"Physical Used" is calculated by DFM as the sum of "Physical Used" of all ASIS volumes. You can check the sum by clicking on the aggregate name in this report, then in the aggregate details jump to the Volumes link then open the "Volume Dedupe ..." report.

I think the two will differ if some non ASIS volumes exist on the aggregate, can you pls check if that's the case.

Thanks,

Raj.

Re: DFM Agg Used Size vs. Physical Used Size

armandol — Wed, 30 Sep 2009 20:05:49 GMT

Raj,

All volumes in all the aggregates have ASIS enabled.

I can see how the physical space is calculated by the following. The following is for aggr1 and all the volumes that exist in aggr1.

Aggr1 Physical Used Space

==========================

df-s

Filesystem used compressed a-sis %saved

/vol/vditemplate01/ 28196880 0 248569848 90%

/vol/vdids3PCC/ 810128928 0 4108791268 84%

Filesystem kbytes used avail capacity Mounted on

/vol/vditemplate01/ 209715200 28196880 181518320 13% /vol/vditemplate01/

/vol/vditemplate01/.snapshot 0 0 0 ---% /vol/vditemplate01/.snapshot

/vol/vdids3PCC/ 1610612736 810128928 800483808 50% /vol/vdids3PCC/

/vol/vdids3PCC/.snapshot 0 0 0 ---% /vol/vdids3PCC/.snapshot

There is no snapshot for the volumes that are in aggr1

===== SNAP-LIST-N =====

Volume vditemplate01

working...

No snapshots exist.

Volume vdids3PCC

working...

No snapshots exist.

Total Aggregate Physical Space: 799GB

However, I do not see how the physical space form the df -s and df commands add up to the used space in the aggregate from the df -A

command. IF you include the aggregate snapshot used space of 263 to the above aggregate physical total of 799 you get 1.061 TB which is not

depicted in the Aggregate Space Availability graph which shows 1.02 TB used.

Aggregate Used Space

====================

df -A

Aggregate kbytes used avail capacity

aggr1 5238716824 1095885552 4142831272 21%

aggr1/.snapshot 275721936 118478352 157243584 43%

Hope this makes sense.

Thanks for the help!