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Thinking About A Nas


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M.2 is a form factor.

 

 

The cache function is to act as a buffer for reads or writes by the appliance. In the case of drives, the SSD M.2 cards is to act as added storage space that's entirely flash based and super fast. In the enterprise world we're starting to get really nice hybrid or all SSD based systems that don't have any delay in reads or writes.

 

 

How the Synologies handle the data across the SSD and spinning disks is a question for the Synology techie folks.

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  • 2 weeks later...

I can thoroughly recommend raid 10, having had a drive fail followed by som idiot pulling the drive next to it out of the rack when trying to hot swap the broken one.

 

No idea who that idiot was...

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A few general remarks.

  1. The fewer drives, the better. Mirroring two big drives is less likely to produce failures than many small ones, assuming otherwise equal failure rates (which is of course not a valid assumption, see table above)
  2. RAIDs with redundancy are no substitute for backups. If one drive goes, chances are that the mirror drive will fail soon, too. They have, after all, the same operating hours.
  3. For video streaming purposes, M2 SSDs are a costly and superfluous luxury. All you need is continuous delivery of data streams at LAN bandwidths; even slow drives can easily deliver that. SSDs are great to reduce latencies, especially when handling many and small files. Video streaming by definition is the handling of very few, rather big ones. It's about the simplest task possible for conventional HDDs
  4. Storage space; 200 DVDs x 4.5 GByte = 0.9 Terabyte --- 200 BluRays x 25 GByte = 5 Terabyte. Your base load isn't very high. If you would take two 10 TByte drives in a RAID 10 you'd have between two and ten times as much storage space available than your specified purpose dictates. Anything beyond that is, IMO, crazy and expensively overdimensioned. Should you one day make the transition to 4K and replace your entire video collection it may be time to reconsider. But by then bigger drives will be cheaper, so why buy five times as much as you need when all that you will accomplish is having to deal with the replacement of failed drives that are only 20% full over the expected life expectancy of the NAS (your kids will grow up and eventually leave home, I take it, probably in the next five to ten years, so don't build your IT infrastructure to last all eternity).

Question time: How do you plan to rip the BluRay disks for your in-house streaming?

Edited by Ssnake
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  • 5 weeks later...

I have decided on the Synology DS918+ with Western Digital RED drives (either 8 or 10 tb). I should have the money saved to get it around mid summer.

 

If you are fitting it with an even number of drives, remember to buy them in different retailers. Different brands would be nice, too.

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I'm gonna buy up a whole bunch of spinning rust drives and then start spreading a rumor that iron oxide cures COVID-19. Profit!

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Backblaze just published their drive stats for 2020 Q2;

 

https://www.backblaze.com/blog/backblaze-hard-drive-stats-q2-2020/

 

HGST comes out looking totally primo.

 

Seagate recovering from their recent troubles.

 

Toshiba still looking good.

 

Keep in mind that these are enterprise-class 7200 rpm SATA drives.

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Ordered a Dell 510 refurb to become my new NAS, 2.6 gHz x 12 cores, 64 mB DDR3, 8x 3 tB SaS, $510 through Amazon.

 

The 12 cores is really overkill for a NAS, i may do VMWARE with Open Media Vault in a VM as my NAS, rather than original plan for FreeNas. That way I can run Windows 2016 and several Linux distributions in VM with their own cores.

 

I have the parts to make a NAS sitting in guestroom (Ryzen 5 1600, 64 mB ddr4, 6x 4 tb SATA), by the time all the parts arrived I had changed shifts so it fell on the backburner. With fall/winter arriving I will probably complete it as FreeNAS eventually. Will give me 41 tB of NAS space between them.

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Dell 510 arrived Sunday, sitting in kitchen, to large/heavy for me to solo move it upstairs to guest room. Researching the Perc controller it won't do FreeNAS or Unraid, so for now I'll do ESXI with OMV.

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