Making a 20tb+ NAS. What RAID?

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Soroid

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Jan 6, 2014
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I want to make a 20+tb NAS and after some research I decided to go with FreeNAS, and to do weekly backups onto some other harddrive (Anytips for this).

The purpose is for media and general backup of important things, so I was thinking of going with Raidz3, but is data striped in raidz3? Because i want to be able to take out harddrives from the nas and plug it into my main computer.

Also, I plan to use this case
Rosewill RSV-L4411~200-250$ @newegg
is there anything better? (I'll be using 12 harddrives, one for the os also)

Planned to use the new kaveri apu with the gigabyte g.1 sniper and a pci-e card that adds 4 SATA iii ports.

Should i get a 2nd network card?
 
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If you want this kind of setup, go with a Windows Server...
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getochkn

getochkn

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Generally you can't pop RAID drives out and into another PC. Also, if you go with freenas and want to use their RAID features and filesystem, Windows wouldn't read it anyways.

You might be better off using freenas and making a few different volumes. One that is RAID'd for important stuff that you want backed up and one that is meh, I could live without that stuff at the cost of all the extra HD space needed.
 
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Kraszmyl

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I currently run an 8tb Raid 6 for storage on my home server and I would suggest another network jack maybe one of the 4 port cards. I have two 10/100/1000 jacks and they are typically maxed out with three users over wired and wireless and it gets really awful during lans.

You generally wont be able to pull individual drives and get data off them with any raid setup except RAID 1

Also as a personal preference I use a RAID card, I don't like setups like yours but they work fine. With how much you're seeming to be spending it might be something to look into however.
 
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Soroid

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So i don't have to use RAID with freenas? :O that's nice.

Is there any backup strategy plan that i should use? Also, what harddrives should i use in the backup system, and what harddrives should i use in the freenas? Should the backup system be... anothe nas?
 
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smitbret

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If you want this kind of setup, go with a Windows Server box and run FlexRAID:

www.flexraid.org

It won't be as fast as FreeNAS, but you have unlimited redundancy possibilities (3 parity drives = RAIDz3). You'll also be able to pull drives out and just pop them into any Windows box and access the data.
 
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Soroid

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What makes it slower than FreeNAS? Or what makes FreeNAS fast? I might also use a linux htpc, so the window box idea might not be so good.

How's unraid?
 
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smitbret

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FreeNAS uses striping across the array so that multiple HDDs are being read from or written to at the same time. FlexRAID stores the file on one physical disk, so you are limited to the speed of that particular drive. That's also why you can just pull the disk from a FlexRAID array and use the data as a stand alone disk, because it's not spread out over several different drives. Any form of striping will keep you from being able to pull the disk out.
 
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Soroid

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So FreeNAS has mandatory RAID? (Striping) Is that just a property of ZFS?

Does Raidz3 stripe? Do all RAIDs stripe? i know raid 1 doesn't...
 
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smitbret

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RAID uses striping and mirroring. RAID 0 only stripes. RAID 1 only mirrors. That's why you get half the total of your HDDs storage space with RAID 1. The rest use some form of both. Only RAID 1 will let you pull the drive out and maintain data.

RAIDz# and hardware RAID5 or 6 stripe data across the disks with an additional parity block(s) so that the loss of a drive leaves you with the original data or enough of the original data that the missing information can be recalculated with the parity blocks.

RAID 10 is a mirror of stripes and gives the speed of RAID 0 with the redundancy of RAID 1.

There are other RAID levels, but these are the ones that are most practical for home use. Even then, the hardware expense of RAID 10 makes it fairly uncommon, too.

If you got to Wikipedia and look up "Standard RAID Levels" and "Nested RAID Levels", you'll get a pretty good idea of how it works.
 
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