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What is difference between total used and total physical used for a volume
2017-03-08
07:37 AM
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Hi,
I would like to know that what is difference between total used and total physical used as shown in below output
an0990-na-cl1::> volume show-space test_vol_iscsi
Vserver : test_svm_iscsi
Volume : test_vol_iscsi
Feature Used Used%
-------------------------------- ---------- ------
User Data 5.02GB 50%
Filesystem Metadata 212KB 0%
Inodes 16KB 0%
Total Used 5.02GB 50%
Total Physical Used 268KB 0%
For my every volume there is huge difference between the two, the above volume "test_vol_iscsi" has gurantee none.
an0990-na-cl1::> vol show-space testroskilde
Vserver : an0990-na-cl1-fcp
Volume : testroskilde
Feature Used Used%
-------------------------------- ---------- ------
User Data 152.6GB 28%
Filesystem Metadata 64.85MB 0%
Inodes 32KB 0%
Snapshot Reserve 27.50GB 5%
Total Used 180.2GB 33%
Total Physical Used 75.43GB 14%
The above volume testroskilde has space gurantee "volume"
Regards..
JP
2 REPLIES 2
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JP -
'Total Used' is the amount of data that should be seen from the client side.
''Physical Used' is the amount of physical storage used on the NetApp.
In your first example for 'test_vol_iscsi' it looks like there hasn't been any data written to the LUN in the volume.
The client sees a 5.02GB LUN, but on the filer it isn't taking up any space yet.
In the second example it looks like you have dedupe and/or compression turned on.
The client(s) have written 152GB of data and there's a snapshot reserve of 27.5GB, but the footprint on disk is only 75.43GB.
You may also wish to look at the 'aggr show-space command to see the effect of volume space guarantee ...
I hope this response has been helpful to you.
At your service,
Eugene E. Kashpureff, Sr.
Independent NetApp Consultant http://www.linkedin.com/in/eugenekashpureff
Senior NetApp Instructor, FastLane US http://www.fastlaneus.com/
(P.S. I appreciate 'kudos' on any helpful posts.)
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I have just recently created this volume "test_vol_iscsi" for testing purpose, then why it is showing 5.02 GB used space ?
Vserver Volume Aggregate State Type Size Available Used%
--------- ------------ ------------ ---------- ---- ---------- ---------- -----
test_svm_iscsi
test_vol_iscsi
n02_sas_1200 online RW 10GB 4.98GB 50%
an0990-na-cl1::> volume show-space test_vol_iscsi
Vserver : test_svm_iscsi
Volume : test_vol_iscsi
Feature Used Used%
-------------------------------- ---------- ------
User Data 5.02GB 50%
Filesystem Metadata 212KB 0%
Inodes 16KB 0%
Total Used 5.02GB 50%
Total Physical Used 268KB 0%
an0990-na-cl1::> volume show-footprint test_vol_iscsi
Vserver : test_svm_iscsi
Volume : test_vol_iscsi
Feature Used Used%
-------------------------------- ---------- -----
Volume Data Footprint 268KB 0%
Volume Guarantee 0B 0%
Flexible Volume Metadata 523.2MB 0%
Delayed Frees 6.82MB 0%
Total Footprint 530.3MB 0%
there are no luns present in this volume, even it is not used for anything like snapmirror etc.
Also when can I say this volume is full when it total used reaches 10GB or when total physical used reaches 10GB ?
Volume total size is 10GB.