I have been reading lots of stuff but trying to find out if a raid10 2drive setup is any better/worse than a normal raid 1 setup....I have to 1Tb drives for my data and a seperate system drive, I am only interested in doing raid on my data... So i setup my initial test like this.... mdadm -v --create /dev/md0 --chunk 1024 --level=raid10 --raid-devices=2 /dev/sdb1 /dev/sdc1 I have also read about near and far but was going to play with this and was wondering if anyone had any insights for 2 drives setup...Thanks... -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100924/9308ef2f/attachment.html>
On 10-09-24 10:27 PM, Tom Bishop wrote:> I have been reading lots of stuff but trying to find out if a raid10 > 2drive setup is any better/worse than a normal raid 1 setup....I have to > 1Tb drives for my data and a seperate system drive, I am only interested > in doing raid on my data... > > > So i setup my initial test like this.... > > mdadm -v --create /dev/md0 --chunk 1024 --level=raid10 --raid-devices=2 > /dev/sdb1 /dev/sdc1 > > > I have also read about near and far but was going to play with this and > was wondering if anyone had any insights for 2 drives setup...Thanks...Raid 10 requires 4 drives. First you would make two RAID 0 arrays, then create a third array that is RAID 1 using the two RAID 0 arrays for it's devices. With only two drives, your option is RAID 1 (mirroring - proper redundancy) or RAID 0 (striping only - lose one drive and you lose *all* data). -- Digimer E-Mail: linux at alteeve.com AN!Whitepapers: http://alteeve.com Node Assassin: http://nodeassassin.org
RAID10 requires at least 4 drives does it not? Since it's a strip set of mirrored disks, the smallest configuration I can see is 4 disks, 2 mirrored pairs stripped. On Fri, Sep 24, 2010 at 7:27 PM, Tom Bishop <bishoptf at gmail.com> wrote:> I have been reading lots of stuff but trying to find out if a raid10 2drive > setup is any better/worse than a normal raid 1 setup....I have to 1Tb drives > for my data and a seperate system drive, I am only interested in doing raid > on my data... > > > So i setup my initial test like this.... > > mdadm -v --create /dev/md0 --chunk 1024 --level=raid10 --raid-devices=2 > /dev/sdb1 /dev/sdc1 > > > I have also read about near and far but was going to play with this and was > wondering if anyone had any insights for 2 drives setup...Thanks... > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > >-- Jacob Bresciani Linux Systems Administrator Advanced Ecommerce Research Systems / Terapeak Cell: 250 418-5412 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100924/e8c908ce/attachment.html>
Jacob Bresciani wrote:> RAID10 requires at least 4 drives does it not? > > Since it's a strip set of mirrored disks, the smallest configuration I > can see is 4 disks, 2 mirrored pairs stripped.He might be referring to what he can get from the mdraid10 (i know, Neil Brown could have chosen a better name) which is not quite the same as nested 1+0. Doing it the nested way, you need at least 4 drives. Using mdraid10 is another story. Thanks Neil for muddying the waters!