Date: Wed, 08 Jul 2015 10:28:16 -0400 From: Mike Tancsa <mike@sentex.net> To: freebsd-fs@freebsd.org Subject: Re: Speeding up resilvering Message-ID: <559D3380.8050703@sentex.net> In-Reply-To: <559D3236.1060102@denninger.net> References: <559D2AB6.5070007@FreeBSD.org> <559D2C7C.6060201@denninger.net> <559D3167.1000705@infracaninophile.co.uk> <559D3236.1060102@denninger.net>
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On 7/8/2015 10:22 AM, Karl Denninger wrote: >>> What OS version? >>> >> 10.1-RELEASE-p10 >> >> Cheers, >> >> Matthew > Look at the IO saturation on the disk channel(s) involved with either > systat -vm or iostat. If the channel is saturated then there's nothing > you can do in terms of tuning; the question then turns to why actual I/O > performance is so poor and has to be addressed there. I had one server that was taking ages, and it turned out to be the controller, not the disk that was hosed. As Karl suggested, take a look at the throughput on gstat. Is anyone disk or groups of disks lagging far behind on write speeds ? In my case, it was a very obvious and glaring outlier. ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/
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