topic Re: Usable Capacity of disks & third party luns in ONTAP Discussions

Usable Capacity of disks & third party luns

MOHAN1985 — Thu, 05 Jun 2025 05:44:49 GMT

Hi,

Is there a command that lists the usable capacity of disks on netapp filer?

If a filer is has storage from a third party, how can these be identified using Data ONTAP commands?.

Thanks,

Mohan

Re: Usable Capacity of disks & third party luns

aborzenkov — Fri, 24 Jan 2014 07:18:53 GMT

On 7-mode “aggr status -r” lists both physical and useable (right-sized) capacity.

Re: Usable Capacity of disks & third party luns

MOHAN1985 — Fri, 24 Jan 2014 11:15:12 GMT

Thanks for the respose, I have the below output from the "aggr status -r" command, output lists only the used and phsysical capacities.

How can usable capacity (usually lesser than the physical capacity) of the disk be determined?

>aggr status -r

Aggregate aggr_1 (online, raid_dp) (block checksums)

Plex /aggr_1/plex0 (online, normal, active, pool0)

RAID group /aggr_1/plex0/rg0 (normal)

RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks)

dparity 0z.112 0a 7 3 FC:A 0 FCAL 10000 136000/278528000 137422/281442144

Thanks,

Mohan

Re: Usable Capacity of disks & third party luns

aborzenkov — Fri, 24 Jan 2014 11:16:29 GMT

Used == usable.

Re: Usable Capacity of disks & third party luns

MOHAN1985 — Fri, 24 Jan 2014 11:38:01 GMT

But, the NetApp Storage administration guide suggests a formula,

Usable Capacity = Raw Capacity - System Reserve Capacity

which indicates usable capacity of a disk is not equal to the raw capacity of the disk.

For Example, let there be disk of physical capacity 100GB, 10GB of the disk space is used for metadata and other purposes. In this case, only 90GB of disk space is available for usage (usable capacity)

How can this be obtained on ONTAP?

Re: Usable Capacity of disks & third party luns

aborzenkov — Fri, 24 Jan 2014 11:40:29 GMT

10% of total aggregate size is reserved for internal use if this is what you mean.