No DISK_REPAIR_TIME on Exadata Cells

Starting with version, Exadata Cells use Pro-Active Disk Quarantine to override any setting of DISK_REPAIR_TIME. This and some other topics related to ASM mirroring on Exadata Storage Servers is explained in a recent posting of my dear colleage Joel Goodman. Even if you are familiar with ASM on non-Exadata Environments, you may not have used ASM redundancy yet and therefore benefit from his explanations about it.

Addendum: Maybe the headline is a little misleading as I just got aware. DISK_REPAIR_TIME set on an ASM Diskgroup that is built upon Exadata Storage Cells is still in use and valid. It is just not referring to the Disk level (Griddisk on Exadata) but instead on the Cell level.

In other words: If a physical disk inside a Cell gets damaged, the Griddisks built upon this damaged disk get dropped from the ASM Diskgroups immediately without waiting for DISK_REPAIR_TIME, due to Pro-Active Disk Quarantine. But if a whole Cell goes offline (Reboot of that Storage Server, for example), the dependant ASM disks get not dropped from the respective Diskgroups for the duration of DISK_REPAIR_TIME.

About these ads

, ,

  1. #1 by Albert on October 6, 2011 - 09:46

    I do like this site from my Oracle Exadata and RAC interest perspective! Very good indeed!

  2. #2 by Uwe Hesse on October 8, 2011 - 08:07

    Thank you, Albert, for stopping by now & then and for your nice words!

  3. #3 by cfakhry on October 31, 2013 - 12:57

    Hi Uwe,

    Its good to know this latest feature ( i was thinking the interest we got to choose a HIGH redundancy on ASM / Exadata )

  4. #4 by Ammar Semle on February 28, 2014 - 18:48

    Hi Uwe, This article and the linked article by Joel was very useful indeed, i always had this confusion w.r.t D_R_T in Exadata. Keep up the good work.

  1. Replacing a damaged Hard Disk on Exadata Cells « The Oracle Instructor

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s


Get every new post delivered to your Inbox.

Join 2,747 other followers

%d bloggers like this: