Date: Wed, 25 Jul 2018 15:59:43 -0700 From: Kirk McKusick <mckusick@mckusick.com> To: "Mikhail T." <mi+thun@aldan.algebra.com> Cc: fs@freebsd.org Subject: Re: core dumps onto ZFS Message-ID: <201807252259.w6PMxhDt055842@chez.mckusick.com> In-Reply-To: <a3574554-731b-6aeb-b7e1-ec29e79d8a00@aldan.algebra.com>
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Is there any chance that your filesystem was more than 90% full? Once ZFS gets past 90% full its performance drops precipitously. As it approaches completely full it locks up for minutes per write doing huge numbers of writes to its pool in an attempt to consolodate what little free space it has left into something big enough for it to use (which it sounds like is happening to you). Kirk McKusick
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