Date: Wed, 02 Mar 2005 18:23:40 +0300 From: Deomid Ryabkov <myself@rojer.pp.ru> To: Lukas Ertl <le@freebsd.org> Cc: freebsd-geom@freebsd.org Subject: Re: gvinum mirror seems to use only one disk for reading Message-ID: <4225DA7C.2060103@rojer.pp.ru> In-Reply-To: <4225D8C1.1000804@rojer.pp.ru> References: <4225CF92.80800@rojer.pp.ru> <20050302153930.D19615@pcle2.cc.univie.ac.at> <4225D8C1.1000804@rojer.pp.ru>
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This is a cryptographically signed message in MIME format. --------------ms030102030103050702060305 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Deomid Ryabkov wrote: > >>> writes go to both drives as they should and tps numbers are the >>> same, as expected, but "time spent processing requests" is different >>> for da0 and da1. >> >> >> >> I've no idea yet, why that happens. Have you checked out gstat(8) >> and how the numbers compare there? >> > about same: da0 getting about twice the load when writing. > sample snapshot of gstat with dd if=/dev/zero of=/usr/test in background: > > dT: 2.009 flag_I 2000000us sizeof 240 i -1 > L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name > 0 0 0 0 0.0 0 0 0.0 0.0| fd0 > 0 85 0 0 0.0 85 10550 3.7 31.2| da0 > 0 84 0 0 0.0 84 10486 2.1 17.4| da1 > 0 85 0 0 0.0 85 10550 3.8 31.5| da0s1 > 0 84 0 0 0.0 84 10486 2.1 17.7| da1s1 well, it actually seems like percentage is computed incorrectly for either of drives, since kbps and transaction values are identical. -- Deomid Ryabkov aka Rojer myself@rojer.pp.ru rojer@sysadmins.ru ICQ: 8025844 --------------ms030102030103050702060305 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature 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