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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, 2022

Applies to:

Oracle ZFS Storage ZS3-2 - Version All Versions and later
Oracle ZFS Storage ZS3-4 - Version All Versions and later
Sun Storage 7410 Unified Storage System - Version All Versions and later
Sun ZFS Storage 7120 - Version All Versions and later
Sun ZFS Storage 7320 - Version All Versions and later
7000 Appliance OS (Fishworks)


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.


 if you try and delete a lun when there is no space you get the following error:

error: An unanticipated system error occurred: cannot set property for
out of space


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