topic Re: Why do volume physical and used capacity slightly differ sometimes? in Active IQ Unified Manager Discussions

Why do volume physical and used capacity slightly differ sometimes?

skellner — Thu, 05 Jun 2025 06:37:10 GMT

Hi,

I try to figure out what the different fields in OM include. In the following report physical and used capacity differ sometimes but I have no idea why. Any hints?

Thanks in advance

v100spldv02:~ # dfm report view sk_vol standort/hannover

Volume Aggregate Total (GB) Physical (GB) Used (GB) Effective (GB) Reserved (GB) Savings (GB) Volume Space Guarantee

------------------------- --------- ------------ ------------- ----------- -------------- ------------- ------------ ----------------------

backuptestq071 aggr0 75 50 50 50 0 0 bytes

common_nfs_002 aggr0 60 0 0 0 0 335 MB file

q005_its_001 aggr0 250 217 217 285 0 68.0 GB file

q007_its_001 aggr0 150 114 115 149 0 34.6 GB file

q010_its_001 aggr0 190 126 130 170 0 43.6 GB file

q011_its_001 aggr0 1200 873 875 1206 0 332 GB file

q012_its_001 aggr0 400 332 333 420 0 88.6 GB file

q013_its_001 aggr0 120 77 78 108 0 30.2 GB file

q015_its_001 aggr0 240 185 186 231 0 45.4 GB file

q017_its_001 aggr0 1600 1053 1056 1540 0 487 GB file <------ ???

q018_its_001 aggr0 110 66 66 97 0 31.0 GB file

q020_its_001 aggr0 350 270 271 351 0 81.1 GB file

Re: Why do volume physical and used capacity slightly differ sometimes?

kryan — Thu, 19 Jan 2012 13:41:52 GMT

You can refer to the "Help --> About this page" topic in the OM GUI for details about report fields on the report currently being viewed.

Re: Why do volume physical and used capacity slightly differ sometimes?

skellner — Thu, 19 Jan 2012 14:16:27 GMT

Thanks for your answer. Unfortunately physical and effective are not explained and these are the ones that I search for.

Re: Why do volume physical and used capacity slightly differ sometimes?

kjag — Thu, 19 Jan 2012 14:22:04 GMT

Hi,

Just check if your snapshot space is overflow in to the data space of volume. AFAIK this is not considered as physical used.

Also if you create a space guaraneed lun(but its not actually consumed, i.e used space is zero), then the physical data size will less than the actual size.

-KJag

Re: Why do volume physical and used capacity slightly differ sometimes?

kjag — Thu, 19 Jan 2012 14:31:27 GMT

Also the "Savings" due to dedupe will not be accounted for Physical used space.

Re: Why do volume physical and used capacity slightly differ sometimes?

kryan — Thu, 19 Jan 2012 14:52:28 GMT

This appears to be a Volume Report.

http://DFMSERVER:8080/help/monitoring/rpt_vol.htm

Volume reports

The Volume reports display information about all volumes and their performance characteristics.

This table lists and describes all fields in the Volume reports.

Effective Used

The active file system (AFS) data in the volume without deduplication space savings, that is, if deduplication was not enabled on the volume.

Physical Used

The active file system (AFS) data in the volume with deduplication space savings.