[zfs-discuss] Improving read IOPS on RAIDZ

Edward Ned Harvey (zfsonlinux) zfsonlinux at nedharvey.com
Sat Apr 30 19:00:31 EDT 2016

> From: Phil Harman [mailto:phil.harman at gmail.com]
> I’ve certainly seen cases where hardware RAID is much quicker than RAIDZ
> (particularly when the controller has some for non-volatile write cache). So
> the question is rather: in what cases is hardware RAID faster, but is it as safe,
> and do we care?

When you're doing writes, there are many configuration options you can consider using, with and without nonvolatile write-back buffers, with and without SSD log device. But that's not the subject of this thread.

The question is about random read IOPS.

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