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Advisory: Degraded Read Performance with Multiple Logical Drives (LUNs) Configured to One Array Group with Specific Conditions


Document ID: c00622089

Version: 1

Advisory: Degraded Read Performance with Multiple Logical Drives (LUNs) Configured to One Array Group with Specific Conditions
NOTICE: The information in this document, including products and software versions, is current as of the Release Date. This document is subject to change without notice.

Release Date: 2006-04-11

Last Updated: 2006-04-11


An issue has been identified on the MSA1000, MSA1500 and MSA1510i arrays where degraded read performance has been observed when multiple logical drives (LUNs) are configured to a single array group. The degraded read performance occurs during heavy write utilization of a LUN and simultaneous read access of another LUN on the same array group.

In situations of performance degradation, performance will drop rapidly.


All Firmware versions for:



In order to prevent the read performance degradation, the following configuration/utilization changes can be made.

  • Move any LUNs under heavy write utilization to its own array group

  • Reduce write IO to the LUN

Hardware Platforms Affected: HP MSA Controllers, HP StorageWorks 1000 Modular Smart Array, HP StorageWorks 1500cs Modular Smart Array
Components Affected: Not Applicable
Operating Systems Affected: Not Applicable
Software Affected: Not Applicable
Third Party Products Affected: Not Applicable
Support Communication Cross Reference ID: IA00598895
©Copyright 2006 Hewlett-Packard Development Company, L.P.
Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The information provided is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental,special or consequential damages including downtime cost; lost profits;damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this document is subject to change without notice. Hewlett-Packard Company and the names of Hewlett-Packard products referenced herein are trademarks of Hewlett-Packard Company in the United States and other countries. Other product and company names mentioned herein may be trademarks of their respective owners.

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