ONTAP Discussions
ONTAP Discussions
Hi,
We have a problem where used space on our aggregate does not equal the total sum of used space for all volumes.
Filer1> df -Ag
Aggregate total used avail capacity
aggr0 9699GB 6042GB 3657GB 62%
aggr0/.snapshot 0GB 0GB 0GB ---%
Filter1> df -sg
Filesystem used saved %saved
/vol/vol0/ 5GB 0GB 0%
/vol/vol_vmware_nfs/ 8456GB 2058GB 20%
As you can see there is approx 8.4TB of space used by all (thin provisioned) volumes, but only 6TB used on the aggregate.
Even taking away the 2TB of de-dupe savings, there is still nearly 500GB that appears to have gone "missing". Can anyone explain what might be going on here?
I have checked and there are no snapshots currently on the volume.
Thanks,
If you want to go for exact caliculation, go for mb or kb level. Then only you will get exact caliculation. NetApp will prefer round figures. If you have a 1GB volume and that is used 900MB but if you check t with df -g it will show u as 0 only.
df -Am
df -m
Also post output of "aggr show_space".
Hi, thanks for the replies. Here is the output. It looks like aggr show_space shows the actual used space of the volume vol_vmware_nfs. Can you help me understand why there is such a difference between the two outputs (9.2TB with df-m and approx 6.6TB with aggr_show_space?)
Aggregate total used avail capacity
aggr0 9932067MB 6757124MB 3174943MB 68%
aggr0/.snapshot 0MB 0MB 0MB ---%
Filer1> df -m
Filesystem total used avail capacity Mounted on
/vol/vol0/ 157593MB 6106MB 151487MB 4% /vol/vol0/
/vol/vol0/.snapshot 8294MB 293MB 8001MB 4% /vol/vol0/.snapshot
/vol/vol_vmware_nfs/ 10485760MB 9200257MB 1285502MB 88% /vol/vol_vmware_nfs/
/vol/vol_vmware_nfs/.snapshot 0MB 507180MB 0MB ---% /vol/vol_vmware_nfs/.snapshot
Filer1> aggr show_space
Aggregate 'aggr0'
Total space WAFL reserve Snap reserve Usable space BSR NVLOG A-SIS Smtape
11300486144KB 1130048612KB 0KB 10170437532KB 0KB 103664352KB 0KB
Space allocated to volumes in the aggregate
Volume Allocated Used Guarantee
vol0 171898376KB 6000312KB volume
vol_vmware_nfs 6643458956KB 6607153892KB none
Aggregate Allocated Used Avail
Total space 6815357332KB 6613154204KB 3250943096KB
Snap reserve 0KB 0KB 0KB
WAFL reserve 1130048612KB 123729496KB 1006319116KB
My best guess is that this is deduplication effect. I.e. logically your files require about 9000GB on volume; but actual space consumption on aggregate level is reduced due to deduplication.