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FAS 2020 6 disks Capacity

Hi!

I have 6 x 1tb disks in RAID 4. 5 data disks and 1 parity disk.

Considering fair size of the disk less than 1 TB I should have about 4TB of space, but Filer display the size of 3.05TB. Where is 1TB?

> vol status vol0 -r

Volume vol0 (online, raid4) (block checksums)

  Plex /vol0/plex0 (online, normal, active)

    RAID group /vol0/plex0/rg0 (normal)

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

      --------- ------  ------------- ---- ---- ---- ----- --------------    --------------

      parity    0c.00.1 0c    0   1   SA:2   -  SATA  7200 847555/1735794176 847884/1736466816

      data      0c.00.2 0c    0   2   SA:2   -  SATA  7200 847555/1735794176 847884/1736466816

      data      0c.00.0 0c    0   0   SA:2   -  SATA  7200 847555/1735794176 847884/1736466816

      data      0c.00.3 0c    0   3   SA:2   -  SATA  7200 847555/1735794176 847884/1736466816

      data      0c.00.4 0c    0   4   SA:2   -  SATA  7200 847555/1735794176 847884/1736466816

      data      0c.00.5 0c    0   5   SA:2   -  SATA  7200 847555/1735794176 847884/1736466816

Pls find screenshot attached

Re: FAS 2020 6 disks Capacity

https://kb.netapp.com/support/index?page=content&id=3011274

And if you do not have access to KB

Raw aggregate size is 4.04TiB. 10% is reserved for WAFL and is never visible which leaves 3.63TiB. As it is traditional volume, 20% is by default reserved for snapshots (and is not counted as available space). Which leaves exactly 2.9TiB. Now NetApp traditionally used definition of GB as 1024 x 1024 x 1000 and my experience is that FilerView is using these units. Which gives us approximately 3.05 "NetApp TB".

"aggr show_space" gives much better information of aggregate space consumption.