Netgear ReadyNAS XRAID2 vs XRAID5/6

We are currently using a RN1500 with 4 2TB drives in X-RAID2 array.  I realize X-RAID is somewhat of a reworked RAID5 but I was hoping someone could help me understand this a little better and clarify if we are truly utilizing this NAS optimally?

We use Egnyte Office Local cloud to sync data within our office of about 25 employees and then a few employees at each of our 65 different properties as well. This device stays pretty busy syncing data every 30 minutes.  The data is often just small writes (eg excel, docs, some pics) but rarely big GB's of data.

Long story short we just purchased an Netgear RN 516 that has 6 drive capacity and I'd like to set it up with the best RAID configuration with redundancy and speed in mind.  Also factoring in the small reads and writes but high volume of them (every 30 minutes) via Egnyte Local Cloud.  Thanks in advance for the responses!
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David Johnson, CD, MVPOwnerCommented:
With today's high density drives Raid 5 has outlived its lifetime considering that all new drives have uncorrectable errors (1 in 10^13 bits consumer grade / 10^14 bits data grade) drives.  Raid 6 is what you need at a minimum once you go over 12TB of raid storage. And in 5 years that will change as well.  Remember RAID is NOT backup, what normally happens is that while rebuilding you have no protection against errors and you will get a RAID error, especially with non data grade raid controllers.  It is faster and more reliable to take out the failed disk, break the raid, iisert the new disk, create a new array and then restore  from backup
Aaron TomoskySD-WAN SimplifiedCommented:
In a multi user environment it's the iops, not the Mbps that will help with the slowdowns.  I personally prefer raid 10 for increased iops in most situations, however I'm not sure what the RN supports. Additionally raid 10 gives you only 50% of raw space.

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Vontech615Author Commented:
Thanks for the replies.  The unit will have a  total of 12TB pre-raid.

@ Aaron the RN supports 0,1,5,6,10 I believe these units ship with Netgear's  X-RAID2 which again is based on RAID 5 but I would like to increase performance and I know RAID 6 might actually come at a cost to performance.  I may give RAID 10 a try.  It seems to be the balance I'm looking for.

Edit: Just doing some research on this and it looks like X-RAID2 wth 4 disks or more is actually a RAID 6 setup (dual redudancy) so we are actually running a RAID 6 config now.  Which would probably be why the performance is a bit slow.
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