Information in this document applies to any platform.
Date of Workaround release: 01-Mar-2012
Date of Resolved Release: 15-May-2012
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Description
An issue with Adaptive Replacement Cache (ARC) tuning may cause ZFS Storage Appliance Software to hang due to excessive memory fragmentation if those systems are configured with shares using multiple block sizes.
Occurrence
This issue can occur in the following releases:
- ZFS Storage Appliance Software 2010.Q3.1.0 and 2011.1.1.0
on the following Sun ZFS 7000 Storage Appliance platforms:
- Sun ZFS Storage 7420 Storage Appliance
Note 1: Sun ZFS Storage Appliance 7110/7210/7310/7410/7120 and 7320 are not affected by this issue.
Note 2: This issue only occurs on systems with 512GB of memory or greater.
Note 3: To determine the current software release, do the following from the Browser User Interface (BUI):
- Navigate to: Maintenance -> System
- The current software release is shown in the 'Current Installation' section under 'Version'.
For example, the 2010.Q3.1.0 release would be shown as: 2010.08.17.1.0,1-1.14.
Note 4: This issue may occur if the Sun ZFS Storage Appliance (ZFSSA) is being configured using multiple shares, and those shares utilize more than one block size. This configuration in combination with a workload that causes the ZFSSA to switch from shares heavily utilizing one block size to shares heavily utilizing another block size can contribute to this issue. One such change in workload may be combining an external load that uses smaller block sizes (ie. 8k) with integrated features like Network Data Management Protocol (NDMP) and replication that normally use large block sizes (ie. 128k).
Symptoms
Should the described issue occur, the affected system slowly becomes unresponsive and will eventually hang.
Workaround
This issue is addressed in the following release:
- ZFS Storage Appliance Software 2011.1.3.0
Sun ZFS Storage Appliance Software information can be found at:
https://wikis.oracle.com/display/FishWorks/Software+Updates
History
01-Mar-2012: Document released.
02-Mar-2012: Additional Product Attribution added
15-May-2012: Update Resolution section, issue is Resolved
Internal Section: Comments:
Confirmation of issue may be validated by issuing a NMI reset/core dump. A NMI coredump can be initiated by contacting Oracle Services.
See CR 7092116 and 7105404 for analysis steps to confirm this issue.
Please send technical questions to:
[email protected]
and copy the Responsible Engineer/Contributor listed below:
Internal Contributor/Submitter: [email protected], [email protected]
Internal Eng Responsible Engineer: [email protected]
Internal Services Knowledge Engineer: [email protected]
Internal Eng Business Unit Group: ZFS Storage Appliance
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