[prev in list] [next in list] [prev in thread] [next in thread]
List: freebsd-fs
Subject: Re: Zfs heavy io writing | zfskern txg_thread_enter
From: Michelle Sullivan <michelle () sorbs ! net>
Date: 2016-02-20 0:12:09
Message-ID: 56C7AF59.6060600 () sorbs ! net
[Download RAW message or body]
Don Lewis wrote:
> On 19 Feb, Niccol=F2 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 becom=
es
>> really slow due of a really heavy io writing. We investigated and we thi=
nk
>> 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 Niccol=F2 on the 9.1 system.
Best regards,
Michelle
-- =
Michelle Sullivan
http://www.mhix.org/
_______________________________________________
freebsd-fs@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-fs
To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic