Mathias Zarick's Blog - Alle Kommentare

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

Mathias Zarick — Mon, 08 Jun 2009 13:45:26 GMT

Hello Martin, Baki, Milen, Mehmood,

thanks for your feedback!

Cheers Mathias

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

Mathias Zarick — Mon, 08 Jun 2009 13:43:52 GMT

Hi Milen,

I would propose the there would be no difference.

In my test I used only one LUN from iscsi, so an I/O failure on this LUN would have the same effect as no connection iscsi filer at all.

Hope to answer your question.

Mathias

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

Mehmood — Sun, 07 Jun 2009 13:50:06 GMT

very nice article, it is very helpful to DBAs.

cheers

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

Milen Kulev — Fri, 22 May 2009 12:29:49 GMT

Hello mathias,

very nice tests ;) I wonder whether there will be any difference in tests if you let only a specific LUNs fail

and not simulate a crash of the whole iSCSI filer (by suspending the VM) ;)

Best Regards. Milen

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

Baki — Sun, 10 May 2009 21:41:22 GMT

greate post. Thanks

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

Martin Berger — Fri, 08 May 2009 06:40:02 GMT

Hi Mathias,

it's great to see you blogging. On more great resource of proved information here!

Just 2 comments:

*) if you want to save the time for wiping the disk, you can also use

Alter Diskgroup DG1 Add Disk '/asm_disks/iscsi.lun1' FORCE;

This might not be a big deal with 1 LUN, maybe with a lot of.

*) As Oracle is really silent about BADFDATA, the function kfdCopy seems to write the corresponding lines into the alert.log. Unfortunately there is not much more Information about kfdCopy, but at least kfd.c seems to hold a lot of functions for dealing with disks used by ASM. (it's not even mentioned in Note:175982.1 yet)

keep blogging,

Martin

Mathias Zarick's Blog - Alle Kommentare

Blogroll Report 30/10/2009-06/11/2009 « Coskan’s Approach to Oracle

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?

re: ASM Disk Groups / Redundancy at Diskgroup Level vs. Redundancy at Template Level. Are there differences?