----- Message from [EMAIL PROTECTED] ---------
Date: Wed, 23 Jan 2008 16:05:40 +1100
From: Michael Harris <[EMAIL PROTECTED]>
Reply-To: Michael Harris <[EMAIL PROTECTED]>
Subject: identifying failed disk/s in an array.
To: linux-raid@vger.kernel.org
Hi,
I have just built a Raid 5 array using mdadm and while it is
running fine I have a question, about identifying the order of disks
in the array.
In the pre sata days you would connect your drives as follows:
Primary Master - HDA
Primary Slave - HDB
Secondary - Master - HDC
Secondary - Slave -HDD
So if disk HDC failed i would know it was the primary disk on the
secondary controller and would replace that drive.
My current setup is as follows
MB Primary Master (PATA) Primary Master - Operating System
The array disks are attached to:
MB Sata port 1
MB Sata port 2
PCI card Sata port 1
When i setup the array the OS drive was SDA and the other SDB,SDC,SDD.
Now the problem is everytime i reboot, the drives are sometimes
detected in a different order, now because i mount root via the UUID
of the OS disk and the kernel looks at the superblocks of the
raided drives everything comes up fine, but I'm worried that if i
move the array to another machine and need to do a mdadm --assemble
that i won't know the correct order of the disks and what is more
worrying if i have a disk fail say HDC for example, i wont know
which disk HDC is as it could be any of the 5 disks in the PC. Is
there anyway to make it easier to identify which disk is which?.
----- End message from [EMAIL PROTECTED] -----
Try this:
mdadm -Q --detail /dev/md0
to see which disk is which disk in the raid.
To identify a disk you can examine it using:
mdadm -E /dev/sd[b-d]
and read your dmesg.
And finally you can use "blkid" to associate UUIDs with devices.
I hope this helps.
Kind regards,
Alex.
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