I've honestly never seen any in-depth comparisons on the performance differences between RAID 0+1 and RAID 10. This article provides a clear explanation on the fault tolerant differences between the two (RAID 10 allowing for a greater combination of drive failures).
http://www.aput.net/~jheiss/raid10/ - Sean On Mon, Apr 11, 2011 at 9:45 AM, Matthew W. Ross <mr...@ephrataschools.org>wrote: > I have a question about Raid 10 vs Raid 0+1... > > I understand the fundamental differences between the two: One is a raid 1 > of two raid 0s, and the other is a raid 0 of two raid 1s... > > Obviously, the raid 10 allows any two disks to die, which I see as an > advantage. Is there some kind of speed improvement with the Raid 0+1 which > is beneficial? As far as I can tell, I would think not... as the raid 0+1 > would require twice the mirroring, and the raid 10 would only require twice > the striping... which I imagine is easier for the controller to do. (Or do I > have Raid10 and Raid 0+1 backward?) > > Also, if you had 8 disks in a raid 10, do you get (Total Space/2), or (4 * > (Total Space of 2 drives/2))? > > Another way to ask: would you have a > > > (Raid0(Raid1(Disk1)(Disk2))(Raid1(Disk3)(Disk4))(Raid1(Disk5)(Disk6))(Raid1(Disk7)(Disk8))) > > or would you have a > > > (Raid0(Raid1(Disk1)(Disk2)(Disk3)(Disk4))(Raid1(Disk5)(Disk6)(Disk7)(Disk8)))? > > I'm sure the answer to this question is "It depends on your raid card." But > I'm curious on what people use and what experiences they have. > > Personally, I've been using Raid 5 or Raid 6 for years, as speed has not > been an issue for us... until very recently. > > > --Matt Ross > Ephrata School District > > > ----- Original Message ----- > From: Crawford, Scott > [mailto:crawfo...@evangel.edu] > To: NT System Admin Issues > [mailto:ntsysadmin@lyris.sunbelt-software.com] > Sent: Mon, 11 Apr 2011 > 10:27:54 -0700 > Subject: RE: Opinion on rebuilding Raid 5 > > > > Theoretically, you could lose half your drives without failure with > > RAID1...but they need to be the "right" half. > > > > From: Ken Schaefer [mailto:k...@adopenstatic.com] > > Sent: Monday, April 11, 2011 9:54 AM > > To: NT System Admin Issues > > Subject: RE: Opinion on rebuilding Raid 5 > > > > RAID1 you lose 50% of disk space > > RAID5 you lose 1/n (n = number of drives) of disk space. (33% for 3 > drives, > > 25% for 4 drives, 10% for 10 drives, 5% for 20 drives etc.) > > > > The larger the number of spindles in your RAID5 array, the less space you > > lose. RAID1 performs better though. Both arrays can lose a single drive > > without failure. > > > > So you need to weigh up whether you need perf or space. > > > > Chees > > Ken > > > > From: Holstrom, Don [mailto:dholst...@nbm.org] > > Sent: Monday, 11 April 2011 10:07 PM > > To: NT System Admin Issues > > Subject: RE: Opinion on rebuilding Raid 5 > > > > With the huge sizes hard drives can reach, is RAID5 still better than, > say, > > mirrored drives? Or some other way. Our consultants want RAID5 for every > > server... > > > > <huge snippage> > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > > > --- > > To manage subscriptions click here: > > http://lyris.sunbelt-software.com/read/my_forums/ > > or send an email to > > listmana...@lyris.sunbeltsoftware.com<mailto: > listmana...@lyris.sunbeltsoftware.com> > > with the body: unsubscribe ntsysadmin > > > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > > > --- > > To manage subscriptions click here: > > http://lyris.sunbelt-software.com/read/my_forums/ > > or send an email to listmana...@lyris.sunbeltsoftware.com > > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe ntsysadmin
