Re: Trying to Simulate a disk failure for one of the disks used by ASM disk group
- From: Seth Miller <sethmiller.sm@xxxxxxxxx>
- To: Hanan Hit <hithanan@xxxxxxxxx>
- Date: Thu, 28 Aug 2014 16:57:54 -0500
The command I used would delete the "/dev/sdc" block device (along with its
partition devices) but you would replace that with whichever block device
you want to make go away.
Seth Miller
On Thu, Aug 28, 2014 at 4:54 PM, Hanan Hit <hithanan@xxxxxxxxx> wrote:
> I can I choose only a single drive - or maybe I didn’t understand that.
>
> Thanks,
> Hanan
>
> On Aug 28, 2014, at 2:52 PM, Seth Miller <sethmiller.sm@xxxxxxxxx> wrote:
>
> Hanan,
>
> You can simply delete the virtual representation of the device from the
> scsi subsystem.
>
> echo 1 > /sys/block/sdc/device/delete
>
> Seth Miller
>
>
> On Thu, Aug 28, 2014 at 1:34 PM, Mark W. Farnham <mwf@xxxxxxxx> wrote:
>
>> doh. right you are.
>>
>>
>>
>> *From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
>> oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *Matthew Zito
>> *Sent:* Thursday, August 28, 2014 1:08 PM
>> *To:* Mark W. Farnham
>> *Cc:* hithanan@xxxxxxxxx; 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@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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