Re: some general md raid questions

["Peter W. Morreale" <morreale@sgi.com>]

On Wed, 2011-10-12 at 10:55 -0700, Keith Keller wrote: 
> On 2011-10-12, Peter W. Morreale <morreale@sgi.com> wrote:
> >
> > Assuming I have two or more jbods attached to the machine, how can I
> > determine which disks are associated with which paths?  (Yes, sorry, I
> > realize this is a general discovery question and not specific to
> > raid :-)
> 
> Not positive this is what you want, but you can look at the udevinfo
> tool:

DOH!  Of course, I can look at the PCI addressing. 

Thanks,
-PWM


> 
> # udevinfo -q all -n sdc1
> P: /block/sdc/sdc1
> N: sdc1
> S: disk/by-id/scsi-1AMCC_A367495389E5F400123E-part1
> S: disk/by-path/pci-0000:01:03.0-scsi-0:0:1:0-part1
> E: ID_VENDOR=AMCC
> E: ID_MODEL=9550SX-16M_DISK
> E: ID_REVISION=3.02
> E: ID_SERIAL=1AMCC_A367495389E5F400123E
> E: ID_TYPE=disk
> E: ID_BUS=scsi
> E: ID_PATH=pci-0000:01:03.0-scsi-0:0:1:0
> 
> I hope someone else can answer your other questions; I've just started
> using mdraid myself.  I have played with the speed_limit parameters, but
> haven't noticed a huge difference (likely because they aren't good
> disks, not a fault with md).
> 
> --keith
>