Date: Mon, 10 Feb 2020 07:19:18 +0000 From: Erik Lauritsen <eriklauritsen@yandex.com> To: freebsd-questions@freebsd.org Subject: Bad ZFS performance on the desktop Message-ID: <17394471581319158@vla1-b55dfea406f0.qloud-c.yandex.net>
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I normally only use ZFS for a storage server, but decided to give it a try on the desktop. I have installed FreeBSD 12.1 on ZFS root in a mirror with 2 x 1TB drives for desktop usage. The performance is terrible every time I use a browser. I suspected the browser cache to be the problem, so I made a tmpfs and put the cache there, but the problem is that browsers write to disk all the time and not only when using the cache. As soon as I shut down the browser, and I have tried with Firefox and others, then the harddrives stops working (I can hear the noise). The browsers are the worst, but other applications that write some stuff to disk is also not so good. I understand that ZFS has to write every single bit to disk twice because I run a mirror, but I am surprised at the performance penalty and how much these drives keep working. I have monitored ZFS using 'top' and can see that it never eats more than half of my memory, so it's not because I'm out of memory. I'm thinking about getting a couple of SSDs, but then again I use backup meticulously and perhaps ZFS on a single drive or just UFS is better for the desktop? Any advice would be greatly appreciated. Kind regards, Erik
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