It also depends on what you use it for. For reading the performance difference is not as dramatic as for writing, especially as you add more disks. For writing the difference will improve with more disks, but will still be less than half of raid1.
On Mon, Apr 11, 2011 at 4:53 PM, Ken Schaefer <[email protected]> wrote: > 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] > 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
