Configure the ASM without ORACLEASM drives


Guys,

I found that right for your perticular kernel asmlib is a PAIN. (I also came to know Oracle dsnt predict asmlib rhel 6)

Finally, we can find those, but can any 1 share knowledge how to configure the asm without Asmlib drives?

I mean I dnt want to use/usr/sbin/oracleasm createdisk/dev/sdb5 (like this)

Now if you ask me what operating system, my OS is RHEL 6.3, but I would like to know for all versions of configuration asmlib.

DB: 11.2.0

Which records exactly? Local? NAS? SAN? Single path of I/O? Multiple I/O paths?

The Linux kernel will automatically enumerate all devices h/w - and udev to create entries of device for these devices. Then all devices scsi for devices SAN/NAS/local lands in tree in/dev automatically.

However, the device names are not static (not even local devices as a new drive added to the server may have an impact of the names of existing devices). So in general, the names of devices directly deprecated. Same fstab/etc/fstab of the kernel utilisΘ string of identifier.

If you have multiple path i/o devices, the multipath driver should be used.

If you have devices path of single e/s (e.g. NAS/iscsi), then you can do the following.

  1. Identify devices using lsscsi
  2. Use fdisk to create one (for example partition 4) partition on the disk, and then assign him da (Non-FSdata) partition type. This allows you to identify via the number of partition storage devices (i.e. all 4 partition are storage). The partition type is a safeguard against accidental to mount the partition as a file system.
  3. Create a udev rule to call for partition devices 4:
    file #: /etc/udev/rules.d/99-oracle-asmdevices.rules
    KERNEL == "sd * 4", BUS == "scsi"PROGRAM="/etc/udev/scripts/localdev.sh %b", SYMBOLIC link += "asm / $result", OWNER = "grid", GROUP = "oinstall", MODE = "0660" "
  4. Create a udev script that will create a special link to device ASM to ASM to use, for example
#!/bin/sh
# file:         /etc/udev/scripts/localdev.sh
# descr:        outputs logical device name for a local asm scsi target

TAG="[scsi]"
BUS=${1}
DRIVE=`echo "$BUS" |  sed 's/://g'`

targetname=disk-${DRIVE}

logger -t $TAG -- "/etc/udev/scripts/localdev.sh bus=$* target=$targetname"

echo "${targetname}"
#eof

So when a partition device 4 is detected, a device entry is created for in/dev/asm. I used a very simplistic device (drive-busid) naming scheme. You can get the WWID of the device and assign more readable names.

You now discovery point ASM string drive in /dev/asm / *.

Once you enter the basics above (it is not that the resort), you can get very creative with how you want to identify the devices for ASM usage - and how you create and name (symbolic link) of the names of devices for ASM.

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