raid 6 On 1/24/2013 7:37 AM, Wenshan Ren wrote: > > Rudi Ahlers writes: > >> On Thu, Jan 24, 2013 at 7:59 AM, Ren Wen shan <renws1990 at gmail.com> wrote: >> >>> Hello everyone, >>> >>> I am new to this group so please forgive me if this question has been >>> already asked. >>> >>> With four identical hard drives, I want to setup RAID 5 + 1 hot spare by a >>> fresh CentOS (6.3) installation. >>> >>> I have read this article ( >>> >>> http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-raid-config.html >>> ) >>> and watched this video (http://www.youtube.com/watch?v=qm3MkuTfDLw), now I >>> have the basic ideas. >>> >>> However, due to my limited experience and knowledge on this area, I am >>> still confused. >>> >>> To make things easier, I only need a swap and a `/' partition. >>> >>> Could you give me any hint on this? What should I read to get the basic >>> knowledge? How can I setup a simple RAID 5 + hot spare? >>> >>> >>> Regards, >>> - Meatball >>> _______________________________________________ >>> >>> >> Since you're new to this list, and this topic, I'm going to spare you the >> headache. Don't use RAID5 Even with a hot-spare, if you use large drives >> chances are you'll loose everything if one of the drive fail and you need >> to rebuild the whole set. >> >> Rather use RAID 10. The newer CentOS installation disks has an option to >> setup RAID10, alternatively. >> >> There are numerous tutorials out there on how todo it, but this one seems >> quite easy to follow: >> http://www.youtube.com/watch?v=zlOK1voR2nA > > Hi Rudi, > > Thanks a lot for your reply, the video is very helpful. > > I read this discussion on serverfault.com > http://serverfault.com/questions/106131/raid-5-with-hot-spare-or-raid-10-with-no-hot-spare > > > but still quite confused as some people think RAID-10 is way safer while > some people wrote: > " > I'd have to disagree with CHopper3. Since there are only 4 drives in > this situation your failure capabilities are the same (2 drives) with > either scenario, except with raid 10 if you happen to lose the wrong 2 > drives then you'll have a real problem. Also there is definitely an > added benefit of having a global spare for your other RAIDs as well. > " > > > My new question is: > As RAID 10 requires at least 4 hard drives (not very sure about this > information), with only 4 hard disks, is RAID-10 without hot spare a > better solution than RAID-5 + 1 hot spare? Why or why not? > > -- > Wenshan Ren > Email: renws1990 at gmail.com > Blog: wenshanren.org > Douban: www.douban.com/people/renws > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >