Oracle ZFS Storage Appliance: Writes to an iSCSI or FC LUN fail with medium errors, filesystem becomes read-only (Doc ID 1469814.1)

Last updated on SEPTEMBER 30, 2016

Applies to:

Oracle ZFS Storage ZS3-BA - Version All Versions and later
Oracle ZFS Storage ZS4-4 - Version All Versions and later
Oracle ZFS Storage Appliance Racked System ZS4-4 - Version All Versions and later
Sun Storage 7310 Unified Storage System - Version All Versions and later
Sun ZFS Storage 7120 - Version All Versions and later
7000 Appliance OS (Fishworks)

Symptoms

On an iSCSI or FC client, a filesystem residing on a ZFSSA LUN has become read-only.

The client system log reports write failures due to "Medium Errors".

Example - on a Linux client:

 

After running a filesystem check (fsck, e2fsck), the filesystem can be mounted read/write.  But when resuming write operations, it goes back to read-only.

 

Cause

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