Re: 11.2 Grid install RHEL5, oracleasm SAN multipath

You should use /dev/mapper/* devices if you are using native linux multipath

Regards

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On Sun, Aug 14, 2011 at 10:31 AM, Manuela Atoui
<manuelaout_at_googlemail.com>wrote:



> Dear all,

>

> I'm currently installing 11.2 grid infrastructure on a RHEL 5.5 system

> and trying to configure oracleasm. Storage is on SAN and the native

> linux multipath driver is used. I'm not the storage expert and unsure

> which partition to use.

>

> Here is the output of fdisk -l:

>

> Disk /dev/sda: 298.9 GB, 298999349248 bytes

> 255 heads, 63 sectors/track, 36351 cylinders

> Units = cylinders of 16065 * 512 = 8225280 bytes

>

>   Device Boot      Start         End      Blocks   Id  System

> /dev/sda1   *           1          13      104391   83  Linux

> /dev/sda2              14       36351   291884985   8e  Linux LVM

>

> Disk /dev/sdb: 901.9 GB, 901943132160 bytes

> 255 heads, 63 sectors/track, 109655 cylinders

> Units = cylinders of 16065 * 512 = 8225280 bytes

>

>   Device Boot      Start         End      Blocks   Id  System

> /dev/sdb1               1      109655   880803756   8e  Linux LVM

>

> Disk /dev/sdc: 901.9 GB, 901943132160 bytes

> 255 heads, 63 sectors/track, 109655 cylinders

> Units = cylinders of 16065 * 512 = 8225280 bytes

>

>   Device Boot      Start         End      Blocks   Id  System

> /dev/sdc1               1      109655   880803756   8e  Linux LVM

>

> Disk /dev/dm-3: 901.9 GB, 901943132160 bytes

> 255 heads, 63 sectors/track, 109655 cylinders

> Units = cylinders of 16065 * 512 = 8225280 bytes

>

>     Device Boot      Start         End      Blocks   Id  System

> /dev/dm-3p1               1      109655   880803756   8e  Linux LVM

>

> Disk /dev/dm-4: 901.9 GB, 901943046144 bytes

> 255 heads, 63 sectors/track, 109654 cylinders

> Units = cylinders of 16065 * 512 = 8225280 bytes

>

> This is the output of /dev/mapper:

> TESTORADATA

> TESTORADATAp1

> VolGroup00-LogVol00

> VolGroup00-LogVol01

> VolGroup00-testdbs

>

> I read the document "How to Partition DM-Multipath Pseudo Devices (Doc

> ID 470913.1)"  and "Configuring Oracle ASMLib on Multipath Disks on

> Linux (Doc ID 394956.1)".

> Is the following assumption right?

> /dev/sdb1 and /devsdc1 are the single paths to the storage, /dev/dm3

> is the multipath?

>

> In order to use multipath, I configured oracleasm that way:

> # ORACLEASM_ENABELED: 'true' means to load the driver on boot.

> ORACLEASM_ENABLED=true

>

> # ORACLEASM_UID: Default user owning the /dev/oracleasm mount point.

> ORACLEASM_UID=grid

>

> # ORACLEASM_GID: Default group owning the /dev/oracleasm mount point.

> ORACLEASM_GID=oinstall

>

> # ORACLEASM_SCANBOOT: 'true' means scan for ASM disks on boot.

> ORACLEASM_SCANBOOT=true

>

> # ORACLEASM_SCANORDER: Matching patterns to order disk scanning

> ORACLEASM_SCANORDER="dm"

>

> # ORACLEASM_SCANEXCLUDE: Matching patterns to exclude disks from scan

> ORACLEASM_SCANEXCLUDE="sdb sdc"

>

> Which disk must I use when creating the ASM disk for Oracle?

> /usr/sbin/oracleasm createdisk CRSVOL1 /dev/dm-3p1

> or /dev/dm-3 or /dev/dm-4?

>

> Thank you very much and have a nice day

>

> Manuela Atoui

> --

> http://www.freelists.org/webpage/oracle-l

>

>

>


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