Date: Wed, 15 Apr 2009 14:49:05 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-questions@freebsd.org Subject: Re: hard drive performance Message-ID: <gs4l3u$75a$1@ger.gmane.org> In-Reply-To: <permail-20090415115413f0889e8400007ff5-a_best01@message-id.uni-muenster.de> References: <permail-20090415115413f0889e8400007ff5-a_best01@message-id.uni-muenster.de>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigB1EC0298C77D7E862A2914F7 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Alexander Best wrote: > hi there, >=20 > i have 2 hard drives running. the first one is SATA300 and the other on= e > UDMA100. here are the dmesg entries: >=20 > ad0: 238474MB <SAMSUNG SP2504C VT100-50> at ata0-master SATA300 > ad1: 157066MB <Hitachi HDS722516VLAT80 V34OA63A> at ata4-master UDMA100= >=20 > i've tried to test the drives' performances using the following command= s: >=20 > dd if=3D/dev/ad0 of=3D/dev/null bs=3D1m count=3D300 > and > dd if=3D/dev/ad1 of=3D/dev/null bs=3D1m count=3D300 >=20 > the results are: > ad0 =3D 314572800 bytes transferred in 4.325645 secs (72722751 bytes/se= c) > ad1 =3D 314572800 bytes transferred in 5.166126 secs (60891430 bytes/se= c) >=20 > the results for ad0 are a bit disappointing though. is this normal or i= s bs=3D1m > wrong? 70+ MB/s is a perfectly fine speed for a modern drive. The "300" in SATA300 doesn't mean what you probably think it means. --------------enigB1EC0298C77D7E862A2914F7 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFJ5dfBldnAQVacBcgRAsMzAKC0Lm8Y69l1QAMIsHAfKEZ6wGI+qwCg626k RpB5KY98EXTvvIaBrGCrfO4= =zKZF -----END PGP SIGNATURE----- --------------enigB1EC0298C77D7E862A2914F7--
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