Date: Wed, 22 Jul 2015 01:32:18 +0100 From: Gary Palmer <gpalmer@freebsd.org> To: javocado <javocado@gmail.com> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: Prioritize resilvering priority Message-ID: <20150722003218.GD41419@in-addr.com> In-Reply-To: <CAP1HOmTo28BishnEdPCBsg7V4M4yYfcSKw_AmUbPP-mW4JtRQg@mail.gmail.com> References: <CAP1HOmTo28BishnEdPCBsg7V4M4yYfcSKw_AmUbPP-mW4JtRQg@mail.gmail.com>
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On Tue, Jul 21, 2015 at 04:06:05PM -0700, javocado wrote: > Hi, > > How does one go about prioritizing the resilvering process so it does not > overwhelm normal disk I/O on a FreeBSD (8.3amd) system? Further, can this > be altered in real time, or do the settings have to be in place prior to > the resilvering even starting? You don't state, but is this on ZFS? I assume they're on 8.3 also, but look at settings like vfs.zfs.resilver_min_time_ms and vfs.zfs.resilver_delay in sysctl. Searching for resilver_min_time_ms and resilver_delay may give some hints, e.g. http://broken.net/uncategorized/zfs-performance-tuning-for-scrubs-and-resilvers/ does the opposite to what you want, but it should give hints. Also https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/zfs-advanced.html I think they're dynamic. I tuned the scrub settings and they took effect immediately. Regards, Gary
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