topic Re: fdisk question in Operating System - Linux

fdisk question

Ravi S. Banda — Tue, 24 Nov 2009 19:07:12 GMT

I understand we can use fdisk to create partitions using a disk; for example:
fdisk /dev/cciss/c0d0p2
1) any already created VolGroups (and LogVols underneath) will be wiped-off, correct!?
2) if 1) is true, can I create new LogVols for the VolGroups of the disk and present them as partitions for my Oracle +ASM instance (where a DISKSTRING needs to be presented) or as raw devices?

Thanks!
Ravi.

Re: fdisk question

Steven E. Protter — Tue, 24 Nov 2009 23:52:33 GMT

Shalom Ravi,

1) Only true if you delete the partition information on the disk /dev/cciss/c0d0p2. It is possible to do this non destructively.

run fdisk -l
Make sure your system is not booting on the disk.

2) You need to consult the Oracle documentation, because my understanding is Oracle would prever not to have disk presented as LVM. ASM wants to own and manage the entire disk for itself.

SEP

Re: fdisk question

Ivan Ferreira — Wed, 25 Nov 2009 14:46:56 GMT

The command must be over the disk without any partition specified:

fdisk /dev/cciss/c0d0

1) It's better if your delete the VGs y LVs before destroying the partition, ensure that the /etc/fstab file does not have any entry for the destroyed LVs

2) Normally, for ASM, you use RAW devices, depending of your Linux version, this must be configured for example, on /etc/sysconfig/rawdevices.