Need help deciding on hard drives for NAS Raid setup

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allahpayneyo

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Mar 29, 2013
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Alright so here's the scoop. I am about to start building my nas, but I need to buy a few more drives. Currently I have 2 3TB WD Greens, 1 3TB Seagate HDD, and 1 2TB Black Hard drive. The black, as of now I am not planning on adding into my nas because it is only 2tb.

The plan right now that I'm thinking about taking includes buying 2 3TB WD Reds and 1 more seagate 3tb hard drive. This way, I can pair the two greens in raid and have the seagate as a backup for all my pictures and music, and then pair the two reds in raid and have the extra new seagate I bought be the clone for those. What do you all think about this idea? It's not extremely cost efficient as both the reds cost $120 ea, and the seagate costs $80. Is the right path for me?

I also found a good deal on some 5k3000 3TB Deskstar NAS drives for $80 per, so if this would be more beneficial than the seagate drives as the backups I could do that as well. Thanks for any help! I will be using the DS1815+ btw.

PS. I'm pretty clueless about this sort of thing, so if my plan is completely wrong just let me know. Also, if somebody could propose a plan that would suit my needs better could you advise me on the raid set up I should pursue with my drives?
 
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kanewolf
First, you need to go to Synology's web page and do some reading...

The 1815+ is a top end unit. Do you have a windows domain that you are attaching to?
That unit has multiple gig-e network ports. IF you have a lot of simultaneous access, you would want to look into link aggregation. If you are using this in a home environment, then you probably don't have sufficient simultaneous accesses to benefit from link aggregation.

Does your 10 to 12 TB need to be a single file system?
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kanewolf

kanewolf

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You have a lot of options with the DS1815+.
First, what is the largest single volume you believe you will need?
What benefit(s) do you believe you will get with multiple RAID 1 volumes rather than using the Synology dynamic RAID that you could expand if desired?

Backup is an important consideration even with RAID. It is good you are thinking about it.
 
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allahpayneyo

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I appreciate the reply! Honestly, I do not even know about all the options available in a RAID set up. What I would need is about 10-12 TB of space that is usable to me, and I just want to know what the best drives for that purpose will be.

What is the synology dynamic raid? I haven't even heard of that yet :/. What do you think I should do?
 
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kanewolf

kanewolf

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First, you need to go to Synology's web page and do some reading...

The 1815+ is a top end unit. Do you have a windows domain that you are attaching to?
That unit has multiple gig-e network ports. IF you have a lot of simultaneous access, you would want to look into link aggregation. If you are using this in a home environment, then you probably don't have sufficient simultaneous accesses to benefit from link aggregation.

Does your 10 to 12 TB need to be a single file system?
 
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allahpayneyo

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It will be used in a home environment, so I think you're right.

I do not need this system to be a single file system, anything can really work for me honestly. I just need files to be backed up and accessible over my network. So if one system or multiple, it's fine by me.
 
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kanewolf

kanewolf

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You have 8 slots in that unit. I would create a RAID 5 (4+1) volume for your primary storage (that would give you about 12TB) You have 3 slots left, You could create a second 3 disk RAID 5 for your backups of your primary volume. You would only have about 6 TB of "backup" space.
 
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allahpayneyo

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What do you think about, for now, just doing the RAID 5 set up 4+1? I think that could work well for me. Will the drives I would be using, the 2 greens, 1 seagate, and 2 reds be sufficient for producing such a raid set up?

And also, what would be my upgrade options from there? Like say I wanted to, 2 months from now add 2 more 3tb reds, could I just rebuild the system with the added storage?
 
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kanewolf

kanewolf

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Again, you NEED to go to the Synology website and READ !!!

According to the website, you can expand a volume by adding disks with RAID5, RAID6 and SHR. I only have a DS415+ so that isn't really an option for me.

You might want to think about how many power-on hours your existing disks have. If they have a lot of hours on them, you will want to be cautious. The likelihood of a failure goes up as disks age.

To lower the probability of a catastrophic failure you could do a RAID 6 (two parity disks) which can survive two disk failures. It would be a 4 + 2 volume with the same amount of usable space.
 
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popatim

popatim

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The backup utility built into the sysnology to back itself up will not backup to another raid that is in it. The Nas will only backup externally; usb or to another nas. I just wanted to be clear since the Nas has a built in utility to back itself up.

You will be fine if you put your data on array1 and a 2nd copy(backup) on array2

ps - you are aware that when you add the drives to any array or even into this nas as a single disk, its going to reformat and erase it/them, right?
 
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