> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx On Behalf Of Jussi Hirvi
> Sent: 30/04/2011 10:31
> To: CentOS mailing list
> Subject: Identifying physical disks
>
> I am sure this is really simple.
>
> I have a setup of 2 disks (sda, sdb) which are outwardly
> identical, and
> are mirrors of each other. Together they form 3 raid1 devices. Both
> disks can boot.
>
> Now sda has bad sectors, and I should replace it. But which
> one of the
> physical disks is sda??
>
> The machine boots fine from either one of the disks, (and the booting
> disk of course is always called sda).
>
> In the messages log I see entries like this:
>
> Apr 29 02:21:07 a134-224 kernel: ata2: SATA link up 3.0 Gbps (SStatus
> 123 SControl 300)
>
> By noticing which SATA link (ata1, ata2) is up and which is
> down, I can
> find out which physical disk is connected to ata1 and which to ata2.
>
> If both disks are connected, will the hd in ata1 become sda,
> and the hd
> in ata2 become sdb??
>
> - Jussi
How about:
ls -l /dev/disk/by-id
which on my system gives me:
lrwxrwxrwx 1 root root 9 Mar 6 14:34 scsi-SATA_SAMSUNG_HD154UIS1XWJ1BZ900317 -> ../../sdc
lrwxrwxrwx 1 root root 9 Mar 6 14:34 scsi-SATA_SAMSUNG_HD154UIS1XWJ1BZ900318 -> ../../sdb
lrwxrwxrwx 1 root root 9 Mar 6 14:34 scsi-SATA_SAMSUNG_HD154UIS1XWJ9CZA00454 -> ../../sdd
which are my three identical Samsung HD154UI disks. Their serial numbers are the S1XWJ... bits at the end.
hth Andy
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