ZFSSA Storage Expansion Behavior

(Doc ID 2203416.1)

Last updated on JULY 24, 2017

Applies to:

Oracle ZFS Storage ZS5-4 - Version All Versions and later
Sun ZFS Storage 7320 - Version All Versions and later
Sun ZFS Storage 7420 - Version All Versions and later
Oracle ZFS Storage ZS3-2 - Version All Versions and later
Oracle ZFS Storage ZS3-4 - Version All Versions and later
7000 Appliance OS (Fishworks)

Goal

 The goal of this document is to better understand:

 

Terminology:

      N  = Number of disks
      BD  = Base disks (i.e., number of disks in initial pool configuration)
      AD  = Additional disks (i.e., number of disks being added while expanding storage)   
      TB  = Terabytes of raw capacity (1000^4 = 1,000,000,000,000 bytes)
      TiB     = Terabytes of usable capacity (1024^4 = 1,099,511,627,776 bytes)

 

 

 

 

 

 

Assumptions:

When this document refers to disks, that means data disks and not log, cache, or spare devices.

Although this information can be applied to data disks of any size, the examples assume data disks are 2TB.

 

Solution

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