Date: Mon, 12 Oct 2015 13:27:48 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: Quartz <quartz@sneakertech.com> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: A couple ZFS questions Message-ID: <alpine.GSO.2.01.1510121324240.16073@freddy.simplesystems.org> In-Reply-To: <56174374.1040609@sneakertech.com> References: <56174374.1040609@sneakertech.com>
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On Fri, 9 Oct 2015, Quartz wrote: > Inside a thread on -questions, it was asked if was a bad idea to have a ZFS > array that spanned different controllers (ie; motherboard sata + pci-e sata). > I answered that AFAIK it was ok as long as the speed of the onboard > ports+drives and card+drives aren't drastically different and that the drives > are the same. But it occurred to me that maybe that's not true [anymore]. Can > anyone with more hardware knowledge chime in? Different should not be a problem. Keep in mind that vdev performance is driven by the slowest device in the vdev. If you have multiple vdevs then overall performance is improved by putting similar performance devices in each vdev since zfs will load-share across them, taking current requests, observed performance, and how full the vdev is into account. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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