Oracle ZFS Storage Appliance: Performance Issue when Pool is almost Full (Doc ID 1392492.1)

Last updated on AUGUST 26, 2016

Applies to:

Sun Storage 7110 Unified Storage System - Version All Versions and later
Sun ZFS Storage 7120 - Version All Versions and later
Sun Storage 7410 Unified Storage System - Version All Versions and later
Sun ZFS Storage 7320 - Version All Versions and later
Sun Storage 7210 Unified Storage System - Version All Versions and later
7000 Appliance OS (Fishworks)
NAS head revision : [not dependent]
BIOS revision : [not dependent]
ILOM revision : [not dependent]
JBODs Model : [not dependent]
CLUSTER related : [not dependent]

Symptoms

To discuss this information further with Oracle experts and industry peers, we encourage you to review, join or start a discussion in the My Oracle Support Community - Disk Storage ZFS Storage Appliance Community

 

Older firmware versions suffered from performance problems when storage pools are beyond some usage (80%).  This is no longer the case, with all supported current Appliance Firmware releases.

There is now no such threshold, such that we will be missing space on disk and having write failures in the first place when the pool becomes full.

We will no longer experience degraded I/O performance, when performing write operations, but get IO errors and conclude that some clean up is needed in order to empty on-disk space for new data.

Observe

cli> status show
Storage:
   pool-0:
      Used     8.58T bytes
      Avail     496B bytes
      State          online
      Compression:   1x
      Dedup:         1.03x
Here, default is the project, fs01 is a filesystem inside the project.
cli> shares select default select fs01 show
     ...
               space_available = 495G
                   space_total = 49K
                    root_group = other

 

 

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms