Label of the ASM to name of LUN mapping; Are not even necessary device names when you use ASMLib?

= Environment details start =.

OS: Oracle Linux 6.4

Version Infra grid: 11.2.0.4

Storage: EMC VMAX

ASM Lib version:

# rpm - qa | grep oracleasm

oracleasm-support - 2.1.8 - 1.el6.x86_64

oracleasmlib - 2.0.4 - 1.el6.x86_64

oracleasm version came not in rpm-qa output may be because it is part of the Oracle Linux kernel. But the 2 components above are not

= Environment details end =.

We have a 2 node RAC cluster.

We wanted to add 2 LUNS to our data Diskgroup and asked team storage available to both nodes of the cluster.

After that they provided, the Linux Admin scanned the LUN and powerpath device names were generated. The powerpath device names like SCSI logic unit number names are incremented sequentially. Because, two additional powerpath LUN used to Node1 to a local file system, the names of powerpath were incrementing differently in the two nodes.

Thus, for the same LUNS emcpowerpath names differed in Node2. Linux Admin did not notice this difference. And he told us the names of newly added from Node1 LUNS powerpath that have been

/ dev/emcpowerv

/ dev/emcpowerw

But in Node2, the same LUN were appointed

/ dev/emcpowert

/ dev/emcpoweru

The DBA guess powerpath name these 2 LUNS will be same on Node2, label the discs to help

oracleasm createdisk DATA17/dev/emcpowerv1

oracleasm createdisk DATA18/dev/emcpowerw1

After marking in node 1, the DBA ran scandisks in Node2. But while the oracleasm scandisks in Node2 is running, it does not seem to/dev/emcpowerv and/dev/emcpowerw in Node2. Instead, ASMLib is smart enough to read the LUN ID in Node1 and search devices powerpath with the same LUN ID and labels as Node1. What's it like in Node2, / dev/emcpowert is labeled DATA17 and/dev/emcpoweru is labeled DATA18 correctly, as shown below.

Node1

Node2

LUN ID

Label of the ASM

/ dev/emcpowerv

/ dev/emcpowert

873F

DATA17

/ dev/emcpowerw

/ dev/emcpoweru

629:

DATA18

Confirmed using the oracleasm querydisk Pei/dev/emcpower < x > .

During labelling using the oracleasm createdisk , since we use the LUN name I always thought that asmlib dealt only with the names of devices (Powerpath name in this case). I didn't know that ASMLib treats ID LUN. If ASMLIB faces in LUN ID internally, then you don't need to have the same name for a particular LUN for disks shared in different RAC nodes? Right?

ASMLIB contains 3 packs. Oracleasmlib, which is distributed under a license of Oracle user space and is not part of the standard GPL software distribution. Oracleasm-support, which is in the standard repository and kernel driver of Oracleasm, which is included in the core Oracle UEK only or distributed by Red Hat to RHCK kernel. The subsequent RHCK driver requires a Red Hat subscription. You need all 3 installed packages.

ASMLib doesn't care to the SCSI ID or device names. When you configure a device to ASMLIB, he writes a header special disk in the device, the command scandisk read and identify a device. ASMLIB devices are populated under the tree of device/dev/oracleasm and found by ASM using the default ORCL: device chain.

Don't forget that ASMLIB does not work with multiple devices and if you use DB-Multipath or EMC Powerpath, you need to blacklist the physical devices so ASMLIB will use powerpath or multipath device instead. Otherwise there will be no failover devices like ASMLIB will simply use the first device found and ignore the other. Check the following:

http://www.Oracle.com/technetwork/topics/Linux/multipath-097959.html

Tags: Database

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