RE: Trying to Simulate a disk failure for one of the disks used by ASM disk group
- From: "Chitale, Hemant K" <Hemant-K.Chitale@xxxxxx>
- To: <hithanan@xxxxxxxxx>
- Date: Thu, 28 Aug 2014 13:52:47 +0800
I would use "dd" to overwrite a disk (or just the header of it) to
simulate a failure.
Was your second test also about removing a disk physically ? And the DG
didn't dismount merely because permissions on the dev had been changed ?
OR was the second test different in some other way ?
Hemant K Chitale
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Hanan Hit
Sent: Thursday, August 28, 2014 7:16 AM
To: Oracle L
Cc: Hit Hanan Gmail
Subject: Trying to Simulate a disk failure for one of the disks used by
ASM disk group
Hi All,
I am sorry for the large distribution but I am somehow hitting a wall.
I have a new 12c single instance install (Oracle Database 12c Enterprise
Edition Release 12.1.0.2.0 - 64bit Production) using ASM on RHEL 6.5.
The underline storage array that I am using is MD-1220 from HP.
I have total of 24 drives that each presented as a single drives.
Using ASMlib.
I was able to create the ASM instance using two disk groups (DATADG with
16 drives and FRADG with 8 disks). I am using Normal Redundancy.
All drives were labeled (first 1M).
Here are the compatibility details of both disk groups:
GROUP_NUMBER NAME
------------ ------------------------------
COMPATIBILITY
------------------------------------------------------------
DATABASE_COMPATIBILITY
------------------------------------------------------------
2 FRADG
12.1.0.0.0
12.1.0.0.0
1 DATADG
12.1.0.0.0
12.1.0.0.0
I also modified the disk repair time for the given disk to 6 hours from
the default of 3.6 hours .
SQL> show parameter disk_
NAME TYPE VALUE
------------------------------------ -----------
------------------------------
asm_diskgroups string FRADG,
DATADG
asm_diskstring string ORCL:*
Now I am trying to simulate a failure of one disk (that of course
shouldn't fail the DATADG).
In the first test we physically plug out one drive (found the right
device) and the DATADG was dismounted (to my surprise). This obviously
didn't work as I expected. I don't think it's a fat finger issue.
In the second test after opening a SR with Oracle, I modified the
permission for the device during the run, rescan the drives but all is
functioning well and not failed disk were encountered.
# chmod 000 /dev/sdd1
# /etc/init.d/oracleasm scandisks
Scanning the system for Oracle ASMLib disks: [ OK ]
So finally, is there a better way to logically simulate a disk failure
with Normal Redundancy and while using my infrastructure?
Any help would be highly appreciated.
Best,
Hanan
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