My CU using ZFS7420 Storage for their exadata db backup and I want to know the snapshot size exactly.
I used to check available pool size and snapshot size via below method.
They taken snapshot daily after db backup automatically, project base snapshot taken(Not per volumes)
1. Shares -> Projects Usages on ZFS WEB GUI.
I Can show the bleow informaion on Usages tab.
Usage 60% of 25TB
Referenced data 10T
Snapshot data 5T
Total space 15T
df -h command display that on nfs mounted host was not strange.
Available size is 10TB remains.
2. My quesiton is in Project's snapshot list pages.(Shares -> Projects -> Snapshots)
They have a 7 snapshot(1~7) and each snapshot entry has below list.
NAME / CREATION / UNIQUE / TOTAL
Upper 7 snapshot has UNIQUE size each and I assume the sum of all snapshot's UNIQUE size is 5T.
But, sum of all snapshot's UNIZUE size is just around 2T.
I guess that Snapshot data(5TB) is not a sum of each snapshot's unique size, right?
I would appreciate if could let me know what is the meaning of UNIQUE size of snapshot?
And, Is it only way to check the all snapshot size using Shares->Project Usages tab?
Is is possible to check the specific snapshot's size(Not all snapshot sum size)?
I'll be looking forward to your reply.