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Sun Storage 7000 Unified Storage System: Sufficient installed RAM is required for efficient use/performance of installed Read SSDs (readzilla) (Doc ID 1532289.1)

Last updated on JULY 25, 2018

Applies to:

Sun ZFS Storage 7320 - Version All Versions and later
Sun ZFS Storage 7420 - Version All Versions and later
Sun Storage 7310 Unified Storage System - Version All Versions and later
Sun Storage 7410 Unified Storage System - Version All Versions and later
Oracle Exalogic Elastic Cloud Software - Version 2.0.3.0.7 to 2.0.3.0.7
7000 Appliance OS (Fishworks)

Symptoms

Customer is losing FC connection frequently in the storage appliance 7320 (not cluster).
Only FC lun service is been used.  Performance issue ?

System configuration is: 7320 + 1 JBOD (1T drives), 24G RAM, 2 x readzillas/logzillas

FC configuration looks OK (Direct Attach - No SAN switches):

Analytics before the reboot shows L2ARC headers using >12G of the available memory.
Drives >95% utilization is also very high. Cache hit rate of only 37%.
Read to write ratio: 70% reads/30% writes.

 

 

Cause

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