linux-kernel - Re: Which disk is ata4?

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Message-ID: <CALCETrUsnxLpv0AuM0792QEFs_dRwCUZz_yxQ3ZObOHXV1AQVw@mail.gmail.com>
Date:	Thu, 30 Aug 2012 08:27:35 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Tim Nufire <linux_ide_tim@...nk.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: Which disk is ata4?

On Thu, Aug 30, 2012 at 8:15 AM, Tim Nufire <linux_ide_tim@...nk.com> wrote:
>
> I'm not sure if there is a better way, but on Debian 5 "Squeeze" I look at the contents of the directory /dev/disk/by-path/
>
> ls -l /dev/disk/by-path/
> total 0
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:00:1f.2-scsi-0:0:0:0 -> ../../sdae
> lrwxrwxrwx 1 root root 11 2012-08-08 14:42 pci-0000:00:1f.2-scsi-0:0:0:0-part1 -> ../../sdae1
> lrwxrwxrwx 1 root root 11 2012-08-08 14:42 pci-0000:00:1f.2-scsi-0:0:0:0-part2 -> ../../sdae2
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-0:0:0:0 -> ../../sda
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-0:1:0:0 -> ../../sdb
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-0:2:0:0 -> ../../sdc
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-0:3:0:0 -> ../../sdd
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-0:4:0:0 -> ../../sde
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-3:0:0:0 -> ../../sdf
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-3:1:0:0 -> ../../sdg
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-3:2:0:0 -> ../../sdh
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-3:3:0:0 -> ../../sdi
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-3:4:0:0 -> ../../sdj
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-4:0:0:0 -> ../../sdk
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-4:1:0:0 -> ../../sdl
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-4:2:0:0 -> ../../sdm
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-4:3:0:0 -> ../../sdn
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:02:04.0-scsi-4:4:0:0 -> ../../sdo
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-0:0:0:0 -> ../../sdp
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-0:1:0:0 -> ../../sdq
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-0:2:0:0 -> ../../sdr
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-0:3:0:0 -> ../../sds
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-0:4:0:0 -> ../../sdt
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-2:0:0:0 -> ../../sdu
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-2:1:0:0 -> ../../sdv
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-2:2:0:0 -> ../../sdw
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-2:3:0:0 -> ../../sdx
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-2:4:0:0 -> ../../sdy
> lrwxrwxrwx 1 root root  9 2012-08-08 14:42 pci-0000:04:04.0-scsi-3:0:0:0 -> ../../sdz
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:04:04.0-scsi-3:1:0:0 -> ../../sdaa
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:04:04.0-scsi-3:2:0:0 -> ../../sdab
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:04:04.0-scsi-3:3:0:0 -> ../../sdac
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:04:04.0-scsi-3:4:0:0 -> ../../sdad
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-0:0:0:0 -> ../../sdaf
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-0:1:0:0 -> ../../sdag
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-0:2:0:0 -> ../../sdah
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-0:3:0:0 -> ../../sdai
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-0:4:0:0 -> ../../sdaj
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-2:0:0:0 -> ../../sdak
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-2:1:0:0 -> ../../sdal
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-2:2:0:0 -> ../../sdam
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-2:3:0:0 -> ../../sdan
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-2:4:0:0 -> ../../sdao
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-3:0:0:0 -> ../../sdap
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-3:1:0:0 -> ../../sdaq
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-3:2:0:0 -> ../../sdar
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-3:3:0:0 -> ../../sdas
> lrwxrwxrwx 1 root root 10 2012-08-08 14:42 pci-0000:06:04.0-scsi-3:4:0:0 -> ../../sdat
>
> The SCSI ids are one less than ATA ids because they start at 0 rather than 1. So, ata4.00 is the same as scsi-3:0:0:0. On my system this means that ata4.00 is sdap.

...which presumably stops working as soon as there's a non-ATA SCSI
device in the system.  (It worked for me, I think, but there really
ought to be a generic solution.)

Again, what's apparently missing is a map between ata
ports/links/devices and scsi hosts/targets/devices.

--Andy
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