RE: fdisk, device mapper and asmlib

  • From: D'Hooge Freek <Freek.DHooge@xxxxxxxxx>
  • To: "cichomitiko@xxxxxxxxx" <cichomitiko@xxxxxxxxx>, ORACLE-L <oracle-l@xxxxxxxxxxxxx>
  • Date: Fri, 17 Feb 2012 22:05:26 +0100

Dimitre,
You probably need to rescan the partition table from the second node.
You can do this by using blockdev --rereadpt <single path device>
Once you have done this, it could be you still need to reread the partition 
table on the multipath device, which can be done using partprobe. After that it 
could be necessary to use kpartx to create the new partition.

I never found why sometimes the multipath and / or the multipath partition 
steps needed to be done and why the sometimes where directly correct after 
using the blockdev command on one of the single path devices.
I can only guess it has something to do with caching.


Regards,

 
Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge@xxxxxxxxx
tel +32(0)3 451 23 82
http://www.uptime.be
disclaimer: www.uptime.be/disclaimer

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Radoulov, Dimitre
Sent: vrijdag 17 februari 2012 21:42
To: ORACLE-L
Subject: Re: fdisk, device mapper and asmlib

Just to add that kpartx and partprobe were executed on the second node 
after the partition was recreated.


Dimitre


On 17/02/2012 21:34, Radoulov, Dimitre wrote:
>
> Hi all,
> again a 2 node RAC 11.2.0.3.1 setup on RHEL 5.7
> asmlib oracleasm-2.6.18-274.17.1.el5-2.0.5-1.el5
> (kernel in use oracleasm-2.6.18-274.17.1.el5)
> Linux native multipath - device mapper
> asm scan order: "mpath_string dm"
> asm exclude: "sd"
>
> We're facing the following issue:
[...]


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