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SPARC M7 Series Servers : ZFS fault on eUSB disk after CMIOU replacement (Doc ID 2184100.1)

Last updated on OCTOBER 11, 2017

Applies to:

SPARC M7-8 - Version All Versions and later
Oracle SuperCluster M7 Hardware - Version All Versions and later
SPARC M7-16 - Version All Versions and later
Information in this document applies to any platform.


After replacing a CMIOU on SPARC M7 servers or SPARC SuperCluster M7 servers, if iSCSI over IPoIB is used as a boot option then the domain owning the eUSB disk from the CMIOU replaced might complain with a ZFS fault when restarting the domains.

For instance :

SUNW-MSG-ID: ZFS-8000-D3, TYPE: Fault, VER: 1, SEVERITY: Major
EVENT-TIME: Thu Sep 15 22:03:09 PDT 2016
PLATFORM: unknown, CSN: unknown, HOSTNAME:
SOURCE: zfs-diagnosis, REV: 1.0
EVENT-ID: 21ba6416-f79f-4b70-9059-e1c705462754
DESC: ZFS device 'id1,sd@SMICRON__eUSB_DISK_______17F0022700070705/a' in pool 'bpool' failed.
AUTO-RESPONSE: No automated response will occur.
IMPACT: Fault tolerance of the pool may be compromised.
REC-ACTION: Use 'fmadm faulty' to provide a more detailed view of this event. Run 'zpool status -lx' for more information. Please e document at for the latest service procedures and policies regarding this diagnosis.
288 Thu Sep 15 22:03:10 2016 Fault Repair minor
Fault fault.fs.zfs.device on component - cleared
287 Thu Sep 15 21:58:52 2016 Fault Fault critical
Fault detected at time = Thu Sep 15 21:58:35 2016. The suspect component: - has fault.fs.zfs.device with probability=100. Refer to for details

See the documents referenced below for further information about iSCSI over IPoIB.

Replacing a CMIOU does not require to transfer the eUSB from the suspect to the new CMIOU unless the eUSB disk is the only device in the boot pool.



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