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
  • 5
  • 2
LVL 34

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 

Open in new window

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.
LVL 34

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)

Open in new window

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

Open in new window

In case you're interested, I made up that script from the output of strace lsscsi. The file is attached
Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

LVL 34

Expert Comment

by:Duncan Roe
ID: 39244062
This is Linux specific sorry. I just noticed you talk about Unix
LVL 34

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.
LVL 34

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.

Featured Post

Top 6 Sources for Identifying Threat Actor TTPs

Understanding your enemy is essential. These six sources will help you identify the most popular threat actor tactics, techniques, and procedures (TTPs).

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
array6 challenfge 6 64
mapShare challenge 13 69
advertisement module in core php 4 92
Recommendation vb6 to or others 14 41
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
"Disruption" is the most feared word for C-level executives these days. They agonize over their industry being disturbed by another player - most likely by startups.
An introduction to basic programming syntax in Java by creating a simple program. Viewers can follow the tutorial as they create their first class in Java. Definitions and explanations about each element are given to help prepare viewers for future …
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now