Serge van Ginderachter » raid http://serge.vanginderachter.be van achtere naer vorene Sat, 21 Apr 2012 10:40:26 +0000 en hourly 1 http://wordpress.org/?v=3.3.2 RAID5 http://serge.vanginderachter.be/2009/raid5/?utm_source=rss&utm_medium=rss&utm_campaign=rss http://serge.vanginderachter.be/2009/raid5/#comments Fri, 02 Oct 2009 12:56:54 +0000 Serge van Ginderachter http://www.vanginderachter.be/?p=1072 serge@mansfield:/tmp$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 loop2[1] loop1[0]
10176 blocks level 5, 64k chunk, algorithm 2 [2/2] [UU]
unused devices: none
serge@mansfield:/tmp$

]]> http://serge.vanginderachter.be/2009/raid5/feed/ 4 On software vs. hardware RAID http://serge.vanginderachter.be/2008/on-software-vs-hardware-raid/?utm_source=rss&utm_medium=rss&utm_campaign=rss http://serge.vanginderachter.be/2008/on-software-vs-hardware-raid/#comments Sun, 15 Jun 2008 07:35:28 +0000 Serge van Ginderachter http://www.vanginderachter.be/?p=715 Christer Edwards wonders how to compare software and hardware RAID.

I was pleasanlty surprised to read the comments being so positive on software RAID, especially on performance.

Let me repeat what I posted:

Over all, I prefer software RAID (on Linux that is) because
- more control
- easy to migrate disks
- no problems with replacing controllers
- no controllers which might ruin your whole array when replacing a disk (happened to me on a Dell box)
- most hosts have enough cpu power to handle the average loads I need in most of my environments

Downside of software raid:
- I wouldn’t use it when your apss need big iron (e.g. heavily used and optimised database environment)
- Bad support from most installers to easily boot from second mirror drive when the first failed; also not so easy to configure Grub to handle all possible failures (e.g. bad FS vs. bad disk)

What are your opinions on this?

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