How to have a script locate a specific hard drive.

Posted on 2013-06-11
Last Modified: 2016-02-11
I am trying to write a shell script to perform some file maintenance on a model of hard drives that I have on several unix boxes. Is there any specific variable that the hard drives report to the OS that I could have the script look for to target these drives if I do not know the name of the volume on each box?

Currently I am just loading the script on that drive and allowing it to work but I would like to be able to just send it to my customer and have them run it without worrying that they got it on the correct drive or doing it myself.

Just in case this differs by manufacturer these are specifically Seagate drives.
Question by:Christopher Gay
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Expert Comment

by:Duncan Roe
ID: 39239534
lsscsi might do the trick
07:42:35$ lsscsi 
[2:0:4:0]    tape    HP       C1537A           L105  /dev/st0 
[3:0:0:0]    disk    ATA      WDC WD2500JD-00G 02.0  /dev/sda 
[5:0:0:0]    cd/dvd  HL-DT-ST CD-RW GCE-8240B  1.06  /dev/sr0 
[9:0:0:0]    cd/dvd  ATAPI    CD-ROM DRIVE-40X T0CP  /dev/sr1 
[9:0:1:0]    cd/dvd  HL-DT-ST DVD-RAM GSA-H22L 1.00  /dev/sr2 
[10:0:0:0]   disk    ATA      QUANTUM FIREBALL APL.  /dev/sdb 
[10:0:1:0]   cd/dvd  SAMSUNG  CD-ROM SC-152C   CS05  /dev/sr3 

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Your script could grep for the disk you want from this output. I have a recent Linux which presents all disks as scsi even if they are ide - you might want to check whether your systems behave likewise. The information comes from the /sys jungle - column 3 is supposed to be Vendor but as you can see it only sometimes is. Still, you get the model.

Author Comment

by:Christopher Gay
ID: 39242813
Unfortunately these unix boxes do not have lsscsi and I am unable to install it to them.
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Expert Comment

by:Duncan Roe
ID: 39244055
That's too bad. Never mind, it seems you can likely get enough from a shell script
  for i in $(ls /sys/bus/scsi/devices);do  echo $i|grep '^[1-9]' >/dev/null 2>&1 && process_target $i;done
  cd /sys/bus/scsi/devices/$1
  [ -d block ] || return
  echo $(cat vendor) $(cat model) /dev/$(ls block)

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The output looks like
20:41:35$ ~/tests/ 
SAMSUNG CD-ROM SC-152C /dev/sr3
ATA WDC WD2500JD-00G /dev/sda
HL-DT-ST CD-RW GCE-8240B /dev/sr0
HL-DT-ST DVD-RAM GSA-H22L /dev/sr2

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In case you're interested, I made up that script from the output of strace lsscsi. The file is attached
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Expert Comment

by:Duncan Roe
ID: 39244062
This is Linux specific sorry. I just noticed you talk about Unix
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Accepted Solution

Duncan Roe earned 500 total points
ID: 39246144
To address your original question: there is nothing in standard Unix that will meet your request. Any solution will involve architecture-specific extensions, such as I posted for Linux.
What is the architecture of your Unix systems? (FreeBSD, Solaris (x86/Sparc), HP-UX, Tru64, ...)

Author Comment

by:Christopher Gay
ID: 39248787

Thanks for the information. I am running FreeBSD and have just updated it to 9.1.
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Expert Comment

by:Duncan Roe
ID: 39249397
I think your best course of action is to post a fresh question making it clear you need a solution for FreeBSD. It's far more important to know that than to know we're looking for a Seagate drive.
I suggest a new Q because the chances of anyone else looking through this Q is rather low now, and I don't know FreeBSD at all well. I would title it something like "FreeBSD - how to determine hard drive models programatically" - don't limit yourself to scripting because the information may only be available to a program.

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