Date: Sat, 20 Feb 2016 01:12:09 +0100 From: Michelle Sullivan <michelle@sorbs.net> To: Don Lewis <truckman@FreeBSD.org> Cc: n.corvini@gmail.com, freebsd-fs@freebsd.org Subject: Re: Zfs heavy io writing | zfskern txg_thread_enter Message-ID: <56C7AF59.6060600@sorbs.net> In-Reply-To: <201602192250.u1JMoLjQ079393@gw.catspoiler.org> References: <201602192250.u1JMoLjQ079393@gw.catspoiler.org>
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Don Lewis wrote: > On 19 Feb, Niccolò Corvini wrote: > >> Hi, first time here! >> We are having a problem with a server running FreeBsd 9.1 with ZFS on a >> single sata drive. Since a few days ago, in the morning the system becomes >> really slow due of a really heavy io writing. We investigated and we think >> it might start at night, maybe correlated to to crondaily (standard) but we >> are not sure. After a few hours the situation returns to normal. >> Any help is much appreciated >> The machine is a Intel Xeon E5-2620 with 36GB of RAM, the HDD is a 2TB an >> is half full. >> > > The only way that you should get a lot of write traffic during the daily > periodic runs is if atime updates are enabled. I don't know what the > default was for FreeBSD 9.1, but recent versions of FreeBSD disable > atime updates on ZFS everywhere except /var/mail. What does > zfs get -o all atime > say? > On 9.2 and 9.3 it seems the default is (respectively): NAME PROPERTY VALUE RECEIVED SOURCE storage atime on - default NAME PROPERTY VALUE RECEIVED SOURCE VirtualDisks atime on - default VirtualDisks/FreeBSD10.0amd64-Build atime - - - VirtualDisks/FreeBSD10.0amd64-OS atime - - - VirtualDisks/FreeBSD10.1amd64-Build atime - - - VirtualDisks/FreeBSD10.1amd64-OS atime - - - VirtualDisks/FreeBSD8.4-Build atime - - - VirtualDisks/FreeBSD8.4-OS atime - - - VirtualDisks/FreeBSD9.0-Build atime - - - VirtualDisks/FreeBSD9.0-OS atime - - - VirtualDisks/FreeBSD9.1-Build atime - - - VirtualDisks/FreeBSD9.1-OS atime - - - VirtualDisks/FreeBSD9.2amd64-Build atime - - - VirtualDisks/FreeBSD9.2amd64-OS atime - - - VirtualDisks/FreeBSD9.2i386-Build atime - - - VirtualDisks/FreeBSD9.2i386-OS atime - - - VirtualDisks/FreeBSD9.3amd64-Build atime - - - VirtualDisks/FreeBSD9.3amd64-OS atime - - - VirtualDisks/FreeBSD9.3i386-Build atime - - - VirtualDisks/FreeBSD9.3i386-OS atime - - - sorbs atime on - default sorbs/VirtualDisks atime - - - It's probably the same for Niccolò on the 9.1 system. Best regards, Michelle -- Michelle Sullivan http://www.mhix.org/
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