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At this moment i have 3 servers running cpanel.

  1. Dell PowerEdge
  2. HP DL360
  3. Intel based (intel boards, cpu, chassis)

    Each server has its own internal storage. What i want is to setup one NAS or SAN or DAS (i don't know witch i need, in question i call it NAS). I am new to network attached storage.
    What i want is:

  4. high availability (redundant power supplies, raid cards, etc)

  5. redundancy
  6. Way to connect one NAS to multiple servers. Here i need dedicated switch for storage network? If that, this is single point of failure, right? I think, that with 1 gigabit link will enough for each server. That means, i need NAS with 10G link? Or better is to put in NAS additional dedicated network card? Maybe connect it to data center switch ? Is it safe? Or connect direct each server to NAS (with dedicated NIC in SAN)?
  7. Way to create virtual disk for each server. For example, if usable space is 12 TB, then split it to four 3 TB partitions and i can give each server 3 TB.
  8. hardware raid (looks like raid6 is way to go)
  9. what about iSCSI?

What is better [from performance aspect] ( if i want 12 TB): place six 3TB drives or eight 2TB in raid6? I think that eight 2TB drives was better performance.
Did i need to keep one spare drive in NAS?

And question: What parameters i have to look when searching for NAS (redundant IO, power)? IO throughput?

And what parameters i don't need? (for example: to scale or another enterprise features)

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Why use slow consumer disks, why not use something a bit performant? –  Chopper3 Jan 22 '13 at 13:32
Just a quick question but are you on a budget? –  Lucas Kauffman Jan 22 '13 at 13:38
If you want performance, you'll want SAS, 10k or more, Avoid RAID5 and 6, use RAID10. iSCSI works as well as anything when properly setup. –  Chris S Jan 22 '13 at 14:01
budget is not specified, but is limited. I don't want to buy expensive NAS with tons of features witch i don't need. –  Guntis Jan 23 '13 at 6:49

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