Latest LQ Deal: Latest LQ Deals
Go Back > Forums > Linux Forums > Linux - Hardware
User Name
Linux - Hardware This forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?


  Search this Thread
Old 09-12-2007, 09:33 PM   #1
LQ Newbie
Registered: Dec 2006
Posts: 4

Rep: Reputation: 0
Question looking for tips, suggestions& ideas on RAID with RHEL

hi there... i'm relatively new to the world of Linux...and even more so to RAID... I'm about to install an Adaptec RAID card into a server running rhel4... the initial idea was to configure RAID5 on four 73G HD...although i'm thinking that i should probably do a RAID 5 on three HD and leave the last for for a possible hot swap if a HD fails? I've never done this before...ever...period....
So, RAID guru's and Linux guru's out there.... any pointers? tips? something to look out for?
Any comments, tips, ideas...anything at all is highly appreciated!
Thanks in advance... :-)
Old 09-13-2007, 02:33 PM   #2
LQ Guru
Registered: May 2005
Location: Atlanta Georgia USA
Distribution: Redhat (RHEL), CentOS, Fedora, CoreOS, Debian, FreeBSD, HP-UX, Solaris, SCO
Posts: 7,831
Blog Entries: 15

Rep: Reputation: 1668Reputation: 1668Reputation: 1668Reputation: 1668Reputation: 1668Reputation: 1668Reputation: 1668Reputation: 1668Reputation: 1668Reputation: 1668Reputation: 1668
RAID 5 can survive one disk failing. The only reason to have hot spare is if you fear you're going to have a second disk fail before you physically replace the failed first disk and have it recover. The hot spare would allow it to rebuild the "failed" drive as soon as it failed. Usually however once you physically replace the failed drive then it rebuilds back to the new drive so that the hot spare can again become the hot spare.

For a small system that only had 4 drive bays unless it was mission critical AND space wasn't expected to ever be an issue I wouldn't bother with a hot spare. We do have high end disk arrays with 15 disks in each enclosure used for large (4 TB) databases. In those we do RAID 1/0 and we do reserve disks for hot spares. Once two years ago while we were doing RAID 5 we did see two disks fail in the same RAID group but overall this is a fairly rare kind of event.


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
RHEL 4 WS & onboard raid controller problem Jukas Red Hat 3 06-29-2007 12:03 AM
Need some install Tips and Suggestions gajaykrishnan *BSD 1 02-27-2007 04:16 AM
RHEL 3: Steps of expanding file system (add new SCSI disks) to existing SW RAID & LVM atman1974 Linux - General 2 01-12-2006 09:49 PM
Rhel 3 Ws & Via Vt8237 Sata Raid prion Linux - Hardware 4 10-27-2004 10:14 PM > Forums > Linux Forums > Linux - Hardware

All times are GMT -5. The time now is 06:07 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration