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On any HPE servers running Red Hat Enterprise Linux 8.8, 8.9, 9.2, or 9.3 and using the Intel Virtual RAID on CPU (VROC), the correspondingmdadmgrow command will not function properly to enable or disable Partial Parity Log (PPL) for the RAID Write Hole (RWH) protection feature on an existing RAID 5 volume, as shown below.When themdadm --grow --consistency-policy=ppl /dev/mdxxxcommand is executed to enable PPL, the command returns an error message:mdadm: Subarray x in /dev/mdxxx is active, cannot update ppl, similar to the following:However, if themdadmcommand is successful in enabling PPL, it does not return any output, and the result can be verified by checking the details of the volume. For a successful enabling of PPL, the "Consistency Policy" should be set to "ppl", as shown below:
This issue has been observed on HPE servers running Red Hat Enterprise Linux 8.8, 8.9, 9.2, or 9.3 and using the Intel Virtual RAID on CPU (VROC).
As a workaround, perform either of the following:On an operating system RAID 5 volume:Reboot the server.During the server Power-On Self-Test (POST), pressF9.From the System Utilities screen, selectSystem Configuration > Intel(R) SATA/sSATA/tSATA Controller or Intel(R) Virtual RAID on CPU > The designated RAID 5 volume > RWH Policy.From the drop-down list, selectDistributed PPL or Disable.SelectChange RWH settings.On a data RAID 5 volume, to ensure that there is no I/O to the RAID volume, perform the following:Get the designated volume's sub-array index in the RAID container. In this example, "md127" is the container name:# mdadm --examine /dev/md127Stop the designated RAID 5 volume. In this example, "md126" is the RAID volume name:# mdadm --stop /dev/md126Use the "ppl" or the "no-ppl" option to enable or disable PPL on the designated volume's sub-array in the RAID container. In this example, the sub-array ID is "0", and "md127" is the container name:# mdadm --update-subarray=0 --update=no-ppl /dev/md127Assemble and activate the RAID volume:# mdadm -AsThis issue is still under investigation. This document will be updated as more information becomes available.RECEIVE PROACTIVE UPDATES: Receive support alerts (such as Customer Advisories), as well as updates on drivers, software, firmware, and customer replaceable components, proactively in your e-mail through HPE Support Alerts. Sign up for Support Alerts at the following URL:HPE Email Preference CenterNAVIGATION TIP:For hints on navigating HPE.com to locate the latest drivers, patches and other support software downloads, refer to theNavigation Tips document.SEARCH TIP:For hints on locating similar documents on HPE.com, refer to theSearch Tips document.
Operating Systems Affected:Red Hat Enterprise Linux 8 Server, Red Hat Enterprise Linux 9
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