Hey All,
I understand the distinction between ontap volume fields logcal-used and used. Can someone please help me understand the difference between used and physical-used?
One of the places we see a marked difference is with clones. What other conditions/configurations would result in a large difference between the two values and what is the technical difference?
Thanks Guys.
#Difference between volume show -fields used,physical-used
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[-used {<integer>[KB|MB|GB|TB|PB]}] - Used Size
If this parameter is specified, the command displays information only about the volume or volumes that have the specified used size. Used is the amount of space occupied by user data and file system metadata. It includes Snapshot spill (the amount of space by which Snapshot copies exceed Snapshot reserve). It does not include the Snapshot reserve.
[-percent-used <percent>] - Used Percentage
If this parameter is specified, the command displays information only about the volume or volumes that have the specified percentage of used space. This row is based on a value of used space that includes the space used by Snapshot copies or the Snapshot reserve (whichever is greater) in relation to the current volume size.
There is a percentage that is reserved for metadata.
pstejska_vsim::> set d
Warning: These diagnostic commands are for use by NetApp personnel only.
Do you want to continue? {y|n}: y
pstejska_vsim::> volume show
show show-footprint show-space
pstejska_vsim::> volume show-footprint
Vserver : pstejska_vsim_node
Volume : vol0
Feature Used Used%
-------------------------------- ---------- -----
Volume Data Footprint 5.83GB 61%
Volume Guarantee 1.94GB 20%
Flexible Volume Metadata 44.68MB 0%
Delayed Frees 91.91MB 1%
Total Footprint 7.90GB 83%
Vserver : svm2
Volume : fg1__0001
Feature Used Used%
-------------------------------- ---------- -----
Volume Data Footprint 14.69GB 12%
Volume Guarantee 0B 0%
Flexible Volume Metadata 92.88MB 0%
Deduplication Metadata 73.36MB 0%
Deduplication 73.36MB 0%
Delayed Frees 710.1MB 1%
Total Footprint 15.55GB 13%
Vserver : svm2
Volume : fg1__0002
Feature Used Used%
-------------------------------- ---------- -----
Volume Data Footprint 11.20GB 12%
Volume Guarantee 0B 0%
Flexible Volume Metadata 92.87MB 0%
Deduplication Metadata 57.68MB 0%
Deduplication 57.68MB 0%
Delayed Frees 959.8MB 1%
Total Footprint 12.29GB 13%
pstejska_vsim::*> volume show-space
Vserver : pstejska_vsim_node
Volume : vol0
Feature Used Used%
-------------------------------- ---------- ------
User Data 5.74GB 73%
Filesystem Metadata 12.14MB 0%
Inodes 31.68MB 0%
Performance Metadata 44.02MB 1%
Total Used 5.83GB 74%
Total Physical Used 5.83GB 74%
Vserver : svm2
Volume : fg1__0001
Feature Used Used%
-------------------------------- ---------- ------
User Data 13.57GB 14%
Filesystem Metadata 13.25MB 0%
Inodes 33.49MB 0%
Snapshot Reserve 5GB 5%
Deduplication 74.98MB 0%
Performance Metadata 80KB 0%
Total Used 18.68GB 19%
Total Physical Used 14.69GB 15%
Use that command to see it better.
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Thanks, Paul!