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Building new home server with RAID 5    Building/Modding/ Overclocking

Started Dec-4 by Joe PC User (JoePCUser); 108 views.
In reply toRe: msg 4

Thanks a bunch for the detailed response. That's a wealth of information.

I am leaning towards ECC. For that I am looking at Asus P10S-V/4L motherboard (for price and availability).

Your comment on the amount of RAM required gave me pause. 16GB of ECC RAM for 8TB of storage space with a 4 x 4TB RADI array (according to an online RAID capacity calculator) is a lot of $$. I'll have to shell out even more $$ if I want to expand the array's capacity. I'm thinking of using Windows 10 instead then. That leads to another question: I've been reading on how to set up RAID, but I'm a bit confused. It seems that if there is hardware RAID support (the ASUS mobo above has it) then there is nothing that needs to be done from the OS, specifically Windows 10, which offers software RAID. I read that Windows 10 recognizes RAID controllers (installing drivers as required), in which case nothing further needs to be done (i.e. it is not necessary to set up RAID through Disk Management). SO, putting all these together, is it correct to say that I can use Windows 10 as the OS with a RAID 10 set up as long as I enablethat in the motherboard's RAID controller ROM?

If I can use Windows 10 with hardware RAID, can I install the OS on a separate SSD and leave the RAID array for data only?

Many thanks for your advice and help.

THECOM
Staff

From: THECOM

Dec-6

Registered ECC DDR4 isn't THAT terribly expensive.

8GB Modules

16GB Modules

This is why I recommend the server-grade boards instead of the workstation-grade stuff.

And YES, with hardware RAID, you can:

  1. Install to the SSD
  2. Set up the RAID in the BIOS and then make it available to the OS.
In reply toRe: msg 6

Thanks again for your reply.

I'll reconsider the amount of RAM. May be my mentality is not quite server oriented, I just think that putting in more than 8GB is too much for what I want the box to do - store and serve files for a few devices around the house.

For some reason, none of your links worked for me, so I have no idea about the motherboard and RAM modules that you wanted me to look at. I live in Canada so availability is not the same anyway. I chose the ASUS  P10S-V/4L motherboard because it is reasonably priced and available. The board seems to be a server grade board, which has the C236 chipset and supports Xenon processors.

Cheers.

THECOM
Staff

From: THECOM

Dec-6

Fricking add pass-thrus...

https://tinyurl.com/ServerBoards

These bad boys: https://tinyurl.com/SeagateCheetah15K

https://tinyurl.com/ECC-DDR4-8GB

https://tinyurl.com/ECC-DDR4-16GB
There, that should cover the 4 links I gave you, in-order.

I'd give you pointers to SAS SSDs, but their pricing is TOTALLY out of whack.
 
  • Edited December 6, 2017 6:59 pm  by  THECOM
xSomeguyx

From: xSomeguyx

Dec-7

I think the commentary on RAID 5 is correct; with BIG drives, rebuild time for a gigantic array is extensive, and is more prone to completely borking since you're taxing the other disks.  I do think that it's overstated though; I've rebuilt RAID 6 arrays (same as RAID 5, but instead of one parity drive there are two) with 12 disks a number of times, and though it's not fast it does succeed.  I'm a big fan of RAID 10 though, especially if you can sacrifice the disk space; the speed boost is real nice, especially when you're talking about writes.



The problem isn't the RAID5 itself.  It's the size of the disks themselves vs the overall number of disks in the raid.
With a 12 disk RAID, you're spreading out your data MUCH further than you are with a 3 drive RAID.  And with double-parity, you have more recovery chances.
With a 4TB drive, the URE rate is something like 10^14.  This gives you an almost guaranteed error at 12.5TB (3 plus a bit) complete read cycles of the array.

Since your RAID is still, only 8TB, your chances of tripping a URE aren't terrible.  The more drives you add, and the more parity stripes you add, the better your chances of not hitting a truly unrecoverable error.

But, with 6, 8 and even the newer 10+TB drives, your chances of tripping a URE are STILL only about 10^14 (some better drives are 10^15, giving you a bigger margin of safety).
Why are these figures not improving with the improvements in tech?  Because the areal density of the drives keep going up.
So, essentially, they're the same mechanism, they're just cramming more into the same space.

  • Edited December 8, 2017 6:50 pm  by  THECOM
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