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Question on space difference between volume and qtree considering efficiency

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Applies to

  • ONTAP 9
  • Volumes/Qtrees

Answer

  • We cannot determine the space difference between the volumes and qtrees, considering efficiencies, and therefore, no specific calculation is available.
  • Efficiency is applied at the volume level, not at the qtree level. Consequently, we have commands to calculate efficiency at the volume level but not at the qtree level.
  • Hence the total "n" number of qtree used size is equal to logical-used size of the volume

Additional Information

  • Here is an example showing how storage efficiencies is calculated at the volume level

cluster::>vol show -fields dedupe-space-saved,used,logical-used,compression-space-saved vol0
vserver   volume        used    dedupe-space-saved compression-space-saved logical-used
--------- ------------- ------- ------------------ ----------------------- -----------------------------------
svm1      vol1          114.8GB 158.9GB            25.84GB                 299.5GB

Used Size: 114.8GB
Logical Used Size: 299.5GB
Space Saved by Storage Efficiency (sis-space-saved): 184.74GB [ Space Saved by Deduplication Along With VBN ZERO Savings (158.9GB)+  Space Saved by Compression: (25.84GB) ]

Which also is the same as:

cluster::> vol show -fields used,logical-used,sis-space-saved vol1
vserver   volume        used    sis-space-saved logical-used
--------- ------------- ------- --------------- ------------------------
svm1 vol1          114.8GB 184.7GB         299.5GB

  • Here is an example showing the total "n" number of qtree used size is equal to logical-used size of the volume

cluster::*> quota report
Vserver: svm1
                                    ----Disk----  ----Files-----   Quota
Volume   Tree      Type    ID        Used  Limit    Used   Limit   Specifier
-------  --------  ------  -------  -----  -----  ------  ------   ---------
vol1     tree1     tree    2           50.20GB  100GB      51       -   tree1
vol1     tree2     tree    3           70.28GB  100GB       6       -   tree2
vol1     tree3     tree    4           40.16GB  100GB       3       -   tree3
3 entries were displayed.

cluster::*> vol show vol1 -fields used, logical-used
vserver      volume              used         logical-used
------- ------ ------- ------------------------------- ---------------
svm1         vol1                71.47GB      162.5GB

Calculation with respect to above details:
• Total "n" number of qtree used size: tree1 [50.20 GB] + tree2 [70.28 GB] + tree3 [40.16 GB] = 160.64 GB
• logical-used of the volume: 162.5 GB

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