Re: Trying to Simulate a disk failure for one of the disks used by ASM disk group
- From: Hanan Hit <hithanan@xxxxxxxxx>
- To: Matthew Zito <matt@xxxxxxxxxxxxxxxxx>
- Date: Thu, 28 Aug 2014 10:09:29 -0700
Yes Matthew I think this is what is happing.
On Aug 28, 2014, at 10:07 AM, Matthew Zito <matt@xxxxxxxxxxxxxxxxx> wrote:
> 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@xxxxxxxx> 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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