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aleeri
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Full Name: Alexander Eriksson
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Advice on design of RAID50/60 60-disks

Post by aleeri » Dec 20, 2017 2:43 pm

Hi,

We are designing a new Veeam backup-solution moving away from Microsoft DPM.
We have around 1000 virtual machines running on Hyper-v Clusters.

We have bought some new hardware for this and have decided to go for a
short-term / long-term design.

The short-term (7days) will have a 60-disk Dell powervault md3060e with 4TB NLSAS drives connected to a DellR740
placed in-house.

The long-term (30days) will have a 60-disk Dell powervault md3060e with 6TB NLSAS drives connected to a DellR740
placed in a co-located datacenter.


For the long-term backups I was thinking of a RAID60 because of fault-tolerance.
For the short-term backups placed in-house it´s more easy to replace broken disks so here
I was thinking about RAID50 for slighly better write perfomance.

But what is the best way to configure the RAID arrays? 6 arrays with 10 disks in each?
For example 6 * 10 RAID6? Here I loose 12 disks if my calculations are correct.

So long story short. How would to design a RAID50/60 with 60 physical disks?

Regards
Aleeri

nmdange
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Re: Advice on design of RAID50/60 60-disks

Post by nmdange » Dec 20, 2017 2:59 pm

If it was RAID 50 I would do 7 disks per RAID 5 (so 8 raid 0 spans of 7 raid5 sets), for 56 disks, plus 4 hotspares. I've been running something similar with raid 50 for several years (which I actually use for both DPM and Veeam)

aleeri
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Re: Advice on design of RAID50/60 60-disks

Post by aleeri » Dec 21, 2017 9:32 am

Thank you for your reply, so how many logical volymes would you get? I guess 1 big maybe isn´t the way to go? Or does it matter?

nmdange
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Re: Advice on design of RAID50/60 60-disks

Post by nmdange » Dec 21, 2017 3:07 pm

Currently I stay under 64tb volume size with NTFS to allow things like dedup (although I'm not doing that currently). 14 4TB drives in 2x7 yields 43tb of space, so in your case you'd have 4 43tb volumes.

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