RE question about path_id of scsi hard disk

["Jack Wang" <jack_wang@xxxxxxxxx>]

> 在 Sat, 21 Jul 2012 06:31:54 +0800，James Bottomley
> <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> 写道:
> 
> > On Fri, 2012-07-20 at 16:24 +0800, gaoqiang wrote:
> >> I'm using udev to manage my hard disks. but I'm confusing
> >> about the "PATH_ID"
> >>
> >> gaoqiang@h150:~$/lib/udev/path_id  /block/sda
> >> ID_PATH=pci-0000:01:00.0-scsi-0:0:0:0
> >>
> >> the path_id is about disk or about disk slot ?
> >
> > Neither: it's pci function and scsi host:channel:target:lun
> >
> > As far as I can tell, path_id returns are completely useless for
> > labelling disks (since host and sometimes target are scan order
> > dependent).
> >
> > James
> >
> >
> 
> I know the host:channel:target:lun but not deeply. the "lun" is about a
> disk, or a disk slot?
> I mean,if I take the disk on a slot and plug in a new disk,will the
> ID_PATH change,or not ?
> 
> many thanks.
> 
[Jack Wang] It depends on driver implement. Driver base on
scsi_transport_sas(like mpt2sas pm8001 isci..)the number always get bigger,
but some driver bind the lun number with topology like phy number.

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