Hi there...I am no Hitachi or SAN expert but could someone explain to me the difference between the "Used" and "Subscription" %.
Should I be concerned with DP0 being close to 80% used?
In your case , no you dont need to worried since the subscription is not greater than the pool capacity. "Used" is the actual data (bits and bytes) written to the disk, "subscription" refers to the capacity allocated to the host
You can find this information and more about Hitachi provisioning at this guide:
"Hitachi Virtual Storage Platform Provisioning Guide for Open Systems"
Capacity = this is the real capacity or the physical capacity of the pool.
for DP0 this is 36.57TB. This capacity really exists within the raid groups that are created from physical disks.
To use this pool you need to create volumes. These volumes are then mapped to the host (or servers)
No of DP VOL -> This tells how many volumes are created from this pool. For DP0 it is 18.
By default these volumes are thin (means when you create them they dont take up any space, as the server starts to
write, they will start to consume space)
Subscribed capacity is the capacity of the total defined volumes (in your case in DP0 the 18 volumes). In your case this
is 36TB. Looks like your in safe hands. This value can be greater than "Capacity" described above. If it is greater then you
have "oversubscribed" the pool.
Now the 18 volumes that you have mapped to the host(servers), are receiving data from the host. The total actual capacity
used by the 18 volumes is 28.9TB and the 79% is the 28.9/36.5 expressed as percentage.
Hope it helps.
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