Rack mountable 1U NAS with replication capability

[hpernu1]

Is there any affordable or just any NAS with the following feature set:
- NFS
- replication capability, synchronous would be best but async is ok. A differential protocol is a must, too much data to copy every time

( Netapp has these but will cost a minimum of 40 000 $, I am looking something in the thousands for dual replicated system. High IO speed is not required. )

Other desirable features(not absolutely necessary):
- 2,5" hard disk support
- redundant power supply

 

[rkaye]

under $40k? loads of choices. why do you want a 1u unit? most people who want a nas want hot-swap bays; and you cant fit too many of those in a 1u container. you want a commercial solution? one that supports a specific raid level? one you can build yourself? how many drives/ how much storage space? how much do you want to spend?