Is calculating IOPS for ZFS RAIDZ different then calculating IOPS for RAID5 & RAID6?

performance storage zfs

This is easier to answer...

It's all distilled here: ZFS RAID recommendations: space, performance, and MTTDL and A Closer Look at ZFS, Vdevs and Performance

  • RAIDZ with one parity drive will give you a single disk's IOPS performance, but n-1 times aggregate bandwidth of a single disk.

So if you need to scale, you scale with the number of RAIDZ vdevs... E.g. with 16 disks, 4 groups of 4-disk RAIDZ would have greater IOPS potential than 2 groups of 8-disk RAIDZ.

Surprising, right?

I typically go with striped mirrors (RAID 1+0) on my ZFS installations. The same concept applies. More mirrored pairs == better performance.

In ZFS, you can only expand in units of a full vdev. So while expansion of a RAID 1+0 set means adding more pairs, doing the same for RAIDZ sets means adding more RAIDZ groups of equal compositon.

Related

Upgrade CentOS 5.x to CentOS 6.x - tips and techniques
Why did rebooting cause one side of my ZFS mirror to become UNAVAIL?
Pros and Cons of a Decentralized Puppet Architecture
$AB-BA=I$ having no solutions
Do values attached to integers have implicit parentheses?
Is it true that the order of $ab$ is always equal to the order of $ba$?
Finite Sum of Power?
If the positive series $\sum a_n$ diverges and $s_n=\sum\limits_{k\leqslant n}a_k$ then $\sum \frac{a_n}{s_n}$ diverges as well
How does the Herglotz trick work?
On the factorial equations $A! B! =C!$ and $A!B!C! = D!$
How to evaluate $\int_0^1\int_0^1 \frac{1}{1-xy} \, dy \, dx$ to prove $\sum_{n=1}^{\infty} \frac{1}{n^2}=\frac{\pi^2}{6}$.
Derivation of asymptotic solution of $\tan(x) = x$.