RE: Trying to Simulate a disk failure for one of the disks used by ASM disk group

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Matthew Zito Sent: Thursday, August 28, 2014 1:08 PM
To: Mark W. Farnham
Cc: hithanan_at_gmail.com; Chitale, Hemant K; ORACLE-L Subject: Re: Trying to Simulate a disk failure for one of the disks used by ASM disk group  

Remember, it's ASM, so there's no mounting or unmounting!

Changing the permissions *might* work, but on Linux, since you still do an open() and get a file descriptor even when you're doing direct I/O, I think it would bypass it if the database is already running (since it already has a valid FD it's writing to/from).      

On Thu, Aug 28, 2014 at 1:03 PM, Mark W. Farnham <mwf_at_rsiz.com> wrote:

If this is Linux or Unix, then probably umount followed by a mount readonly would do the trick if you’re writing to that disk at all.  

Possibly changing the permissions would intervene, but I think that varies about whether that will stop a running application that already has a file open.  

Heh. It was easier when there was a button on each drive you could toggle to make it read only.    

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