Sanjay,
If the disk group is normal or high redundancy and there is at least one1. Can I drop this disk and bring the Diskgroup up ?
multiple Database ?2. Can I recover the Database once the DG is mounted instead to restore
Seth
I can understand that playing with kfed/amdu is really scary thing and ust
want to play on my personal laptop now to get well versed with outputs and
commands.
Quick question, that if I had multiple database sharing same diskgroup and
lost the disk in the diskgroup then
1. Can I drop this disk and bring the Diskgroup up ?
2. Can I recover the Database once the DG is mounted instead to restore
multiple Database ?
T
Sanjay
On Wednesday, February 24, 2016 10:35 AM, Seth Miller <
sethmiller.sm@xxxxxxxxx> wrote:
Sanjay,
Although this is probably not the answer you are looking for but, at the
point you are describing the best way is to engage Oracle Support. There
are a number of good articles on using kfed/kfod and manual disk repair,
and the ASM SMEs at Oracle are really smart and willing to share their
information but, once you start messing with the disk header, you are deep
in the weeds and certainly unsupported without the direct involvement of
Oracle Support.
Seth Miller
On Wed, Feb 24, 2016 at 9:27 AM, Sanjay Mishra <smishra_97@xxxxxxxxx>
wrote:
Seth
If header is not repairable then what is the best way to bring environment
back with less downtime. Scenario is Disk group is 20Tb and Lost disk is
512G.
TIA
Sanjay
On Tuesday, February 23, 2016 3:29 PM, Seth Miller <
sethmiller.sm@xxxxxxxxx> wrote:
Sanjay,
There are ways to fix corrupt ASM disk headers (other than restoring a
backup of the header) so no, it is not true that all the data would be lost
if external redundancy disk header is lost.
However, this scenario is exactly why you would not use external
redundancy of you are unable to protect the disks and the headers at the
storage layer.
There are scenarios where you would have separate disk groups for each
database but these would generally not be for protecting data, but
segregating it for purposes of using storage snapshots.
Seth Miller
On Tue, Feb 23, 2016 at 10:48 AM, Sanjay Mishra <
dmarc-noreply@xxxxxxxxxxxxx> wrote:
Hi
Need some expert opinion on Oracle ASM best practices and high
availability. It is recommended to have minimum DG using ASM like DATA/FRA
for multiple database on the Cluster. Now I had seen some scenario, where
one disk header on External Redundancy DG causes to restore all Database
and hence Major failure. Does this not make sense to create multiple DG
like DATA for each Database and FRA can be shared ?
Please share your opinion and just for reference that Disk header in such
scenario was not recoverable from backup header.
TIA
Sanjay
