RAID10 vs RAIDZ2 : r/truenas - Reddit

View community ranking In the Top 5% of largest communities on Reddit. RAID10 vs RAIDZ2 . Got 4x4TB drives in 2x striped mirrors. I would like to add 2x 16TB drives. I love the flexibility …

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RAID10 Vs RAIDZ2 : R/truenas - Reddit

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View community ranking In the Top 5% of largest communities on Reddit. RAID10 vs RAIDZ2 . Got 4x4TB drives in 2x striped mirrors. I would like to add 2x 16TB drives. I love the flexibility …

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FAQs about RAID10 vs RAIDZ2 : r/truenas - Reddit Coupon?

Is RAID-Z2 faster than RAID 10?

RAID10 was supposed to be faster, since it is all striped but no parity bits. But now I'm reading that RAID-Z2 is fast after all? Basically, I do want the ability to exchange drives if they break, but most important to me is increased speed. I want my reads and writes to be significantly faster than single-drive. ...

What are the disadvantages of RaidZ 2?

Drawback is you can only lose one disk per mirrored vdev. RAIDZ-2 (RAID6) can tolerate the failure of any two disks, but is much slower. The slowness of RAIDZ2 doesn’t matter for most NAS users because the network speed is a lot slower than even a single disk and writes tend to be large and sustained or relatively few. ...

Why does raidz2 resilver so long?

The issue is with rebuild potential stressing the mirror drive and it failing. Whereas even if you get a catastrophic failure of another drive in RAIDZ2, you still rebuild / recover. The other side of this is that resilver times on Z2 are significantly longer than on mirrors. Longer resilvering correlates with more likely cascading drive failures. ...

Why is raidz1 not recommended?

Let’s say user has 4 or maybe 6 disk. Striped mirrors yields the best performance but at only 50% space efficiency AND you are also vulnerable to the wrong 2 disks breaking at the same time, taking down your entire pool. Or the mirror disk breaks while you resilver. I.e exactly why RaidZ1 is usually not recommended. ...

Can I convert raidz1 to raidz2?

You cannot convert from raidz1 to raidz2 later. In either case, backups are highly recommended. If you dont need the space, you could also go 3-way mirror with the drives you have. This will give you faster resilver times (no parity) and the same level of resilience as a raidz2 . ...

Is 3 wide raidz2 possible?

3-wide raidz2 is not possible: 4 drives minimum. Mirrors are more flexible (can change width, add or remove vdevs), but 3-way mirrors (for good resiliency) are not as space-efficient as raidz2 (33% vs. 50% minimum, 67-75% for “sweet spot” 6- to 8-wide raidz2) and thus a lot more expensive. You get what you pay for. ...