?
Solved

Hard drive configuration option on a Linux OS

Posted on 2012-04-12
6
Medium Priority
?
319 Views
Last Modified: 2012-04-16
What is best practice for configuring two 500GB hard drives using Linux?  I plan to install an IDS service on the platform and would like to take advantage of both physical drives. Can it be a 1+0 set?

I am not familar with Linux beyond basic caommand sets.

Thank you.
0
Comment
Question by:lipotech
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 88

Assisted Solution

by:rindi
rindi earned 500 total points
ID: 37841334
The OS is irrelevant here. If you have 2 disks of the same size I'd use RAID 1 with every OS.
0
 
LVL 13

Accepted Solution

by:
Sandy earned 252 total points
ID: 37841415
Yes,  you can go ahead with this and i suggest you to use raid 0 in case you are seeking redundancy.

#mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1 will help you in this required.
0
 
LVL 88

Assisted Solution

by:rindi
rindi earned 500 total points
ID: 37841496
No, RAID 0 is the opposite of redundancy. If one disk fails in a RAID 0 array, you loose everything, your OS and data. RAID 0 is only good if you need speed and for temporary data.

RAID 1 (mirroring) is the only 2-disk array that gives you redundancy. If one disk fails and the other is fine, your OS and all your Data will still be fine.

Please note that no form of RAID excuses you from making backups.
0
Percona Live Europe 2017 | Sep 25 - 27, 2017

The Percona Live Open Source Database Conference Europe 2017 is the premier event for the diverse and active European open source database community, as well as businesses that develop and use open source database software.

 
LVL 20

Assisted Solution

by:Daniel McAllister
Daniel McAllister earned 248 total points
ID: 37842641
The linix mdraid command set will allow (and help you) create a RAID 10 (which is a combined RAID 1 (mirror) and RAID 0 (stripe) set using just 2 disks (essentially, the disks are each split in half). The resulting performance isn't as nice as a RAID 10 set with 4 drives, but it's better than just the RAID 1 performance.

<from the Linux RAID creation wkik>
RAID10,F2

The Linux MD raid10 has another way to be created - it uses only one mdadm command. For an array of 4 drives use:

# mdadm -C /dev/md0 --chunk=256 -n 4 -l 10 -p f2 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1

Note that this can even be done with only 2 drives (-n 2). For newer drives as of 2008 it is recommended by the people on the linux-raid kernel mailing list to use chunk sizes between 256 kiB and 1 MiB.

To be clear, using 2 drives is trickier... (you'd use pieces with labels like /dev/sda1 /dev/sda2 /dev/sdb1 /dev/sdb2), but mdadm is supposed to be able to figure all that out for you...

Of course, with a pair of 500GB drives, using RAID 10 gives you only 500GB of usable space....

Good luck!

Dan
0
 

Author Closing Comment

by:lipotech
ID: 37851155
Thanks to all.
0
 

Author Comment

by:lipotech
ID: 37851158
Thank you.
0

Featured Post

WordPress Tutorial 3: Plugins, Themes, and Widgets

The three most common changes you will make to your website involve the look (themes), the functionality (plugins), and modular elements (widgets).

In this article we will briefly define each again, and give you directions on how to install them.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The purpose of this article is to demonstrate how we can use conditional statements using Python.
Google Drive is extremely cheap offsite storage, and it's even possible to get extra storage for free for two years.  You can use the free account 15GB, and if you have an Android device..when you install Google Drive for the first time it will give…
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.
Suggested Courses
Course of the Month15 days, 6 hours left to enroll

741 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