What are the OS for NAS?

Question

NAS

Good afternoon!
I want to assemble a NAS on an old atom, there are 4 disks with a total capacity of 10 TB. (There will be 5 TB of storage)
I'm looking at FreeNAS - but confuses the requirements of ZFS - 8 GB of memory. My mother gets only 4 GB. No longer supported.
Will it work fine with 4 GB of memory?
If not - what are the adequate alternatives to FreeNAS (to use another file system)?
Tasks:
1. Backup storage
2. Network share
3. FTP / SSH for backups
4. 4 iSCSI disks for 4 computers (1 computer - 1 disk) computers with SSD, which is enough for the OS and a little more. The rest I want to put into storage. This task is not critical. If 4 GB is not enough for it - to flattery.
Please advise software for NAS with the above tasks.

Answer 1

I'm looking at FreeNAS - but confuses the requirements of ZFS - 8 GB of memory. My mother gets only 4 GB. No longer supported.
Will it work fine with 4 GB of memory?

This is not a requirement, but a strong recommendation to achieve maximum performance in a corporate environment with deduplication enabled . Deduplication is very memory intensive, yes. But it can be turned off.
Personally, I've run ZFS at 1G with a 32-bit processor quite successfully, although the recommendations strongly call for a 64-bit processor and 8G.
A more recent version of FreeNAS is NAS4Free
. List of alternatives:

• FreeNAS
  
• NAS4Free
  
• ZFSguru
  
• Gluster
  
• OpenMedia Vault
  
• openfiler
  

Answer 2

nas4free, openmedia vault.
In general, freenas works for me on 2Gb and everything works fine (prefetch is disabled, ARC is small) on linear reading.