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September 24th, 2011 01:00
Different emcpower device names on cluster nodes
Hi,
I am building a cluster on RHEL 5 with nodes connected to SYMMETRIX via PowerPath 5.6.
My concern is devices (LUNs) are showing in different names. For instance one of the LUN showing in node1 as /dev/emcpowere and on the second node as /dev/emcpowerf, how can I make the device name identical?
Also which device name is recommended to use in fstab as I see the all LUNs have two names /dec/emcpower and /dev/sd when I use fdisk -l?
Thanks and Regards,
Siraj.
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dynamox
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September 24th, 2011 05:00
we get these behavior on our RAC servers all the time but it's fixed easily. Take a look at man pages for emcpadm command. This command will allow you to export "powerpath to device" mappings from one host and import them on the other.
It is best if you use PowerPath devices in fstab, LVM ..etc. Take a look at the following two documents:
PowerPath for Linux Installation and Administration Guide 5.6 A02
EMC Host Connectivity Guide for Linux -- A27
SKT2
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September 25th, 2011 10:00
is there a reason you are not using LVM? is this an Oracle ASM setup?