Date: Wed, 20 Mar 2013 13:24:17 +0100 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: freebsd-fs@freebsd.org Subject: Re: FreBSD 9.1 and ZFS v28 performances Message-ID: <op.wt8veruy8527sy@ronaldradial.versatec.local> In-Reply-To: <alpine.GSO.2.01.1303192031480.11141@freddy.simplesystems.org> References: <514729BD.2000608@contactlab.com> <810E5C08C2D149DBAC94E30678234995@multiplay.co.uk> <51473D1D.3050306@contactlab.com> <1DD6360145924BE0ABF2D0979287F5F4@multiplay.co.uk> <51474F2F.5040003@contactlab.com> <E106A7DB08744581A08C610BD8A86560@multiplay.co.uk> <51475267.1050204@contactlab.com> <514757DD.9030705@contactlab.com> <42B9D942BA134E16AFDDB564858CA007@multiplay.co.uk> <1bfdea0efb95a7e06554dadf703d58e7@sys.tomatointeractive.it> <alpine.GSO.2.01.1303192031480.11141@freddy.simplesystems.org>
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On Wed, 20 Mar 2013 02:34:16 +0100, Bob Friesenhahn <bfriesen@simple.dallas.tx.us> wrote: > On Mon, 18 Mar 2013, Davide D'Amico wrote: >>> While running the tests what sort of thing are you >>> seeing from gstat, any disks maxing? If so primarily >>> read or write? >> Here the r/w pattern using zpool iostat 2: > > Using 'zpool iostat 2' is not likely to be very useful since zfs writes > all of is data in bursts and may wait up to 5 seconds to do so. > > If your benchmark uses synchronous writes and does continous updates, > then you should see zfs writing continiously to your zil device (or the > pool). > > Bob Zpool iostat 2 still prints the per-second-speed. So it is the amount of data divided by 2. It is easier to reason about it if you use zpool iostat 1. Ronald.
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