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Best raid 4x4tb

alex87alex

Dabbler
Joined
Jun 28, 2017
Messages
17
Hello everyone,
I have an HP Microserver gen10 with 16gb ram, 4x4tb Seagate, an ssd for the system and a 10gb card and I want to install truenas, so my question is:

What is the best raid configuration in your opinion?
Actually I have truenas with 6x4tb on raid-z2 but I want to disassembly this becouse I don't need so much space and I have to sell the nas (hp ml10 gen9).

You have to consider that actually I have a vm with truenas with a single 8tb disk that is a replication server for the nas, I'll keep it, so I could consider a raid-z1...

What do you think? raid-z1 or raid-z2? Mirror?

Help me please
Thank you very much
 

ornias

Wizard
Joined
Mar 6, 2020
Messages
1,461
Only use Raidz1 if you would be okey with a stripe (no redundancy).
With 4x4, you are basically limited to striped mirrors.
 

danb35

Hall of Famer
Joined
Aug 16, 2011
Messages
13,540
With 4x4, you are basically limited to striped mirrors.
Well, you could use RAIDZ2 instead. Redundancy would be better that way. But I think I'd agree that mirrors would be the way to go.
 

ornias

Wizard
Joined
Mar 6, 2020
Messages
1,461
Well, you could use RAIDZ2 instead. Redundancy would be better that way. But I think I'd agree that mirrors would be the way to go.
Statistically speaking the redundancy is worse using RAIDZ2, definately now Mirrors have sequential rebuild and Raidz doesn't... or on par, depending on the viewpoint, who you ask and when you ask them. xD
 

danb35

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I was thinking of the ability to lose any two disks without data loss in RAIDZ2--with mirrors, if the wrong two disks go, the pool is lost. But yes, resilvers on mirrors are faster, which offsets this (at least to a degree).
 

alex87alex

Dabbler
Joined
Jun 28, 2017
Messages
17
Thank you for reply!

I'm not so skilled with zfs so I created a testing vm. Is this the correct configuration for striped mirror? Thank you

2020-12-31 12_03_29-TrueNAS - 172.18.66.93.png
 

alex87alex

Dabbler
Joined
Jun 28, 2017
Messages
17
I was thinking of the ability to lose any two disks without data loss in RAIDZ2--with mirrors, if the wrong two disks go, the pool is lost. But yes, resilvers on mirrors are faster, which offsets this (at least to a degree).
Performance-side striped mirrors have better performance (speed transfers) comparison with raidz2?
 

danb35

Hall of Famer
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Aug 16, 2011
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I don't believe striped mirrors are any better for sequential transfers than RAIDZ2, but more vdevs -> more IOPS.
 

SweetAndLow

Sweet'NASty
Joined
Nov 6, 2013
Messages
6,415
I don't believe striped mirrors are any better for sequential transfers than RAIDZ2, but more vdevs -> more IOPS.
Read should be a little faster also because your can read from both mirrored hdds. But really iops is what's important.
 
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