HP Tru64 UNIX - Version 5.1B-4: Potential Erroneous Handling of Failed Disk I/O



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 Advisory Information

LAST UPDATE: 2008-07-10


Under certain rare circumstances in HP Tru64 UNIX v5.1B-4, a failed disk I/O can be returned to the caller with success status. The erroneous return occurs only when all three of the following circumstances take place:

  • The I/O is a disk write, and
  • The I/O is being retried within the bad block replacement code, and
  • The I/O was returned from storage with a HARDWARE ERROR (4h) sense key

 The Early Release Patch (ERP) announced in this document resolves this potential handling error. HP strongly recommends that all customers running HP Tru64 UNIX v5.1B-4 and TruCluster Server v5.1B-4 install this ERP.


The following supported version is affected:

  • HP Tru64 UNIX/TruCluster Server v5.1B-4



HP is releasing the following ERP kit publicly for use by any customer. The ERP kit uses dupatch to install and will not install over any Customer Specific Patches (CSPs) that have file intersections with the ERP. Contact your service provider for assistance if the installation of an ERP is blocked by any of your installed CSPs.

The fix contained in this ERP kit is targeted for availability in the following mainstream patch kit:

HP Tru64 UNIX 5.1B-5

Early Release Patch

HP Tru64 UNIX version: 5.1B-4
Kit Location: