info about hdds in raid

[Leonard Chatagnier]

--- On Mon, 11/2/09, Preston Hagar <prestonh at gmail.com> wrote:

> From: Preston Hagar <prestonh at gmail.com>
> Subject: Re: info about hdds in raid
> To: "Ubuntu user technical support, not for general discussions" <ubuntu-users at lists.ubuntu.com>, eugeneapolinary81 at yahoo.com
> Date: Monday, November 2, 2009, 5:06 PM
> On Mon, Nov 2, 2009
> at 4:47 PM, Eugeneapolinary Ju <eugeneapolinary81 at yahoo.com>
> wrote:
> 
> 
> How can I tell wich HDD to swap, when the "cat
> /proc/mdstat" says one HDD of the RAID1 array has
> died?
> 
> Does the HDD's has some serial numbers, that I can see
> in "reality", and I can get that number from e.g.:
> a commands output?
> 
> 
> How could I know wich HDD to swap in e.g.: a RAID1 array?
> 
> thank you
> 
> 
> cat /proc/mdstat 
> 
> should give you the devices in your RAID1 array.  For
> example, lets say they are /dev/sda1 and /dev/sdb1
> 
> 
> Now, if you run
> 
> sudo lshw
> 
> you will get a lot of output about your system.  Look for
> the disk section with the failed /dev/sd device in it.  For
> example, let's say /dev/sda1 is the failed drive.  When
> I do sudo lshw on my system, I end up with this disk section
> relating to /dev/sda:
> 
> 
>   *-disk:0
>              description: ATA Disk
>              product: ST3320620AS
>              vendor: Seagate
>              physical id: 0
>              bus info: scsi at 0:0.0.0
>              logical name: /dev/sda
> 
>              version: 3.AA
>              serial: 4QF0028B
>              size: 298GiB (320GB)
>              capabilities: partitioned
> partitioned:dos
>              configuration: ansiversion=5
> signature=000d9eb3
> 
>          
> 
> This should give you all the information you need to
> determine which physical drive it is.  
> 
> Hope this helps,
> 
>
I read this with interest but I don't see where the commands would show which drive has failed.  Is is something obvious to you that isn't to me, someone who has never used any raid setup. I certainly would like to know as I have a computer in my lan with 2 HDDs that someday when I'm feeling reckless may try to set up a raid system.
Leonard Chatagnier
lenc5570 at sbcglobal.net