4 Replies Latest reply: Nov 21, 2011 8:16 AM by user12028775 RSS

    Assign PVID to ASM disks

    user12028775
      Hi,

      SO: AIX 6.1
      Oracle: 11.2.0.3

      I heard from some professionals that we should not assign PVID for ASM disks.
      I have Luns (ASM Disks) with PVID assigned used by ASM in production.
      Is there any issues that would prevent I set PVID?
        • 1. Re: Assign PVID to ASM disks
          ora_tech
          Hi,

          Refer Links below:
          http://oracle.erkansaka.org/2010/10/aix-asm-metadata-disks.html
          http://download.oracle.com/docs/cd/E11882_01/install.112/e10814/storage.htm#CWAIX276

          thanks,
          X A H E E R
          • 2. Re: Assign PVID to ASM disks
            Levi Pereira
            Hi,
            user12028775 wrote:
            I heard from some professionals that we should not assign PVID for ASM disks.
            I have Luns (ASM Disks) with PVID assigned used by ASM in production.
            Is there any issues that would prevent I set PVID?
            Big YES.

            When the PVID is set to a disk in a volume group, the PVID is stored in two locations. In Physical disk header ( within first 4K )and in AIX's system object database, called ODM ( Object Data Manager ).

            When the diskgroup is created, the disk header information of PVID is overwritten. However, with reboot the OS, from ODM, AIX might try to restore the PVID information onto the disk header, there by destroying the ASM metadata.

            You can use this note to fix it:

            Corrective Action for Diskgroup with Disks Having PVIDs [ID 750016.1]

            Hope this helps,
            Levi Pereira
            • 3. Re: Assign PVID to ASM disks
              585179
              user12028775 wrote:
              Hi,

              SO: AIX 6.1
              Oracle: 11.2.0.3

              I heard from some professionals that we should not assign PVID for ASM disks.
              I have Luns (ASM Disks) with PVID assigned used by ASM in production.
              Is there any issues that would prevent I set PVID?
              Hi,

              Additional please have a read Assigning a Physical Volume ID (PVID) To An Existing ASM Disk Corrupts the ASM Disk Header [ID 353761.1]

              It might cause the ASM disk header corrupt if you assign PVID


              Cheers
              • 4. Re: Assign PVID to ASM disks
                user12028775
                Thank all.
                Here is danger of assign PVID *"with reboot the OS, from ODM, AIX might try to restore the PVID information onto the disk header"*