Hello, Ok I managed to fix this myself using the mdadm options in /etc/mdadm.conf

Many thanks

Arun

-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org]On Behalf Of Arun Tagarsi Sent: Sunday, October 02, 2005 1:10 PM To: CentOS mailing list Subject: [CentOS] mdadm quandary

Hello, I wonder if has seen a problem of the sorts I am describing as at the moment it is driving me nuts.

We have an array of LSI disks (Hardware Raid 5) which are attached to a Linux node. The Node has a LSI929 dual fibre channel card that has a channel attached to controller A and B of the array.

So we have a list of devices under /proc/partitions mapping what we are expecting to see , for example the devices

/dev/sdd1 (A) and /dev/sdx1 (B ) would form a raid 0 device under linux to make a file system slightly under 1TB.

This file system was created using the older mkraid utils at the time but has been in production for over a year.

This node and the array unfortunately had a power outage and the resulting problem faced by us is the following.

The raid start up fails with as it cannot find a device /dev/sdai1 . This device is not part of the /etc/raidtab but is a normal device defined in the /dev directory.

There are no references to the /dev/sdai1 device in /proc/partitions at all . All devices expected as /dev/sdd1 and /dev/sdx1 are listed and show the expected sizes. so I presume these are the only devices that the Linux box would be able to work with.

If I run a mdadm --examine of the /dev/sdd1 it shows me that indeed /dev/sdd1 and it is lun 0 of the MD device but it also has references to the /dev/sdai1 device.

The mdadm --examine /dev/sdx1 shows up as /dev/sdai1 and is lun 1 of the MD device.

This is where I am totally confused and I hope I was able to explain the problem .

Is there a way to change the super block from referencing sdai1 to sdx1? without compromising the array . The data on the array we suspect is intact and would take a great deal of time to restore.

Thanks for your time.

Arun

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