RE: Which (physical) disk is broken?

On Wednesday December 22, michael@insulin-pumpers.org wrote:

<snip>

quoted

Use a command like this to cause your disks to have activity, then look for
the blinking lights:
dd if=/dev/md/1 of=/dev/null bs=64k

Oh swell!.... I have one blinking light for ALL the disks on all 12 of 
our raid systems. There has to be a better way.

There are really only two ways:

 1/ make lights blinks.
 2/ have labels on the front of each bay saying what SCSI (or
    whatever) ID the device has.

If your storage array does not have per-device lights, or per-device
labels, you should speak sternly to your hardware provider.

NeilBrown