Error 'CDB: Unmap/Read sub-channel TIMEOUT_ERROR' on Nutanix Virtual Machines

This document (7022293) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 12 Service Pack 2 (SLES 12 SP2)
SUSE Linux Enterprise Server 12 Service Pack 3 (SLES 12 SP3)


This error is observed when performing fstrim of xfs file system LUN presented by Nutanix Acropolis hypervisor (AHV):

                 CDB: Unmap/Read sub-channel TIMEOUT_ERROR


Fixed in:-

SUSE Linux Enterprise Server Service Pack 2:    kernel-default-4.4.103-92.53.1
SUSE Linux Enterprise Server Service Pack 3:    kernel-default-4.4.92-6.18.1


Unaligned SCSI unmap requests from fstrim cause disk congestion, I/O aborts and in extreme cases virtual machine hangs.

Additional Information


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  • Document ID:7022293
  • Creation Date: 08-Nov-2017
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server

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