Date: Tue, 26 Apr 2016 15:47:33 +0000 (UTC) From: DH <dhutch9999@yahoo.com> To: <freebsd-fs@freebsd.org>, Miroslav Lachman <000.fbsd@quip.cz> Subject: Re: How to speed up slow zpool scrub? Message-ID: <698816653.2698619.1461685653634.JavaMail.yahoo@mail.yahoo.com> References: <698816653.2698619.1461685653634.JavaMail.yahoo.ref@mail.yahoo.com>
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>5GB of RAM That seems to be an insufficient amount of system ram when employing zfs. Take a look at this: http://doc.freenas.org/9.3/freenas_intro.html#ram David Hutchens III System Administrator -------------------------------------------- On Tue, 4/26/16, Miroslav Lachman <000.fbsd@quip.cz> wrote: Subject: How to speed up slow zpool scrub? To: freebsd-fs@freebsd.org Date: Tuesday, April 26, 2016, 5:44 AM Hi, is there any way to make zpool scrub faster? We have one older machine with CPU Pentium(R) Dual E2160 @1.80GHz, 5GB of RAM and 4x 4TB HDDs. It is just a storage for backups for about 20 machines. Scrub is scheduled from periodic each 30 days but it takes about 4 days to complete and everything during scrub is slow. Backups takes 8 hours instead of 5 (made by rsync), deleting of old files is even more slower. The backups are made every night from the midnight to morning, the machine is idle for the rest of the day. Is there any tuning to make scrub faster in this idle time? Or is it better to do it other way - slower scrub with even lower priority taking for about one week but not affecting time of normal operations? (is it dangerous to have scrub running this long or reboot machine during the scrub?) I have a performance graphs of this machine and CPU is about 70% idle during scrub, but hard drives are busy 75% (according to iostat) FreeBSD 10.3-RELEASE amd64 GENERIC Miroslav Lachman _______________________________________________ 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"
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