Date: Thu, 24 Feb 2011 19:23:54 +0100 From: Christer Solskogen <christer.solskogen@gmail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: Re: ZFS - abysmal performance with samba since upgrade to 8.2-RELEASE Message-ID: <AANLkTi=qM8Jym1SpVSoYKC%2B1mqjmuYudVhT5m%2BhXQgJ7@mail.gmail.com> In-Reply-To: <20110224075517.GA18146@icarus.home.lan> References: <4D660909.6090202@my.gd> <20110224075517.GA18146@icarus.home.lan>
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On Thu, Feb 24, 2011 at 8:55 AM, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > > # Set TXG write limit to a lower threshold. This helps "level out" > # the throughput rate (see "zpool iostat"). A value of 256MB works well > # for systems with 4GB of RAM, while 1GB works well for us w/ 8GB on > # disks which have 64MB cache. > vfs.zfs.txg.write_limit_override=1073741824 > > Sorry if you have said this before, but could you elaborate a bit about this number? For instance, how much does the cache on the disk has to say. In my case: 3x1.5TB raidz with WD15EADS-00R6B0 which has 32MB cache and 12GB memory. What would you recommend and why. -- chs,
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