Automating Unmirror and Remirror for Solaris Volume Manager Volumes

1. 

   Dec 29, 2008

   Rahim.Othman says:

   Thanks for the information. I have couple of questions though: In the case of...

   Thanks for the information. I have couple of questions though:

   • In the case of RAID 1 (two mirrored disks), when the mirroring is disabled, which disk the system is going to use?
   • If the upgrade fails and wants to boot from the other disk; how do we do that and make sure when mirroring is enabled again that the "failed upgrade disk" will mirror to the other disk not the other way around?

   Thanks in advance for the response.

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   1. 

      Jan 14, 2009

      victorfeng1 says:

      Sorry for this late. 1. When we disable mirroring, we actually use "metadetach...

      Sorry for this late.

      1. When we disable mirroring, we actually use "metadetach" to unmirror those SVM volumes. But if the mirroring is disabled by system mulfuntion, e.g. SVM module could not be loaded during booting, the OS will not even start up.

      2. In this case, you need to manually mirror the "failed upgrade disk".

      Victor

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      1. 

         Jan 15, 2009

         Rahim.Othman says:

         Hi Victor, Thanks for your response. It seems I did not phrase my question prop...

         Hi Victor,

         Thanks for your response. It seems I did not phrase my question properly (especially the first part).

         1. I understand that if the mirroring is disabled by system mulfuntion, e.g. SVM module could not be loaded during booting, the OS will not start up. What I meant was, when you run "unmirror" and the system reboots, which disk it will use to boot from (suppose you have 2 disks; disk0 & disk1)? From my observation I noticed it will use disk0 to boot from. When you run "remirror", it will attach disk1 again and sync it with disk0. Let me know if this is not the case.

         2. Suppose you have two disks (disk0 & disk1) and you ran "unmirror" and rebooted the system. Based on the above observation, the system is running on disk0. If the upgrade/activity fails, my question is, how do you force the server to use disk1 (which was not affected by the activity since it was detached) to boot from instead of disk0 (which had failed the upgrade) when reboot? Once you can boot from disk1, you can them manually enable mirroring and let disk0 sync with disk1 in this case.

         Thanks again for your help,
         Rahim

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         1. 

            Jan 18, 2009

            victorfeng1 says:

            1. You are right. 2. at OBP prompt, ok> boot disk1 Victor

            1. You are right.

            2. at OBP prompt, ok> boot disk1

            Victor

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            1. 

               Jan 19, 2009

               Rahim.Othman says:

               Thank you!

               Thank you!

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2. 

   Dec 31, 2008

   CMacWasHere says:

   Hello and thanks for your comment. We have sent it along to the author of the ar...

   Hello and thanks for your comment. We have sent it along to the author of the article (a member of the sys admin community). Happy New Year from the BigAdmin team.

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   1. 

      Jan 05, 2009

      Rahim.Othman says:

      Thanks and happy New Year

      Thanks and happy New Year

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