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:[email protected]] To: NT System Admin Issues [mailto:[email protected]] 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:[email protected]] > 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:[email protected]] > 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 > [email protected]<mailto:[email protected]> > 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 [email protected] > 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 [email protected] with the body: unsubscribe ntsysadmin
