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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
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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.