Oracle ZFS Storage Appliance: How To Resolve Files Taking Too Much Space With 8TB Drives And RAID2Z Pool Configurations

(Doc ID 2185053.1)

Last updated on SEPTEMBER 23, 2016

Applies to:

Oracle ZFS Storage ZS4-4 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-2 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-4 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-BA - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS5-2 - Version All Versions to All Versions [Release All Releases]
7000 Appliance OS (Fishworks)

Symptoms

On certain ZFS Storage Appliances we have seen RaidZ2 filesystem filling up faster than anticipated.

This was observed where the customer was using a record size of 8k blocks for a NFS file system and the pool was using 8TB drives in a RaidZ2 pool.

One example was du -h reported 17K on an 8192 byte (8K) write from NFS.

 

Cause

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