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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[-- Attachment #1 --] Alexander Best wrote: > hi there, > > i have 2 hard drives running. the first one is SATA300 and the other one > UDMA100. here are the dmesg entries: > > ad0: 238474MB <SAMSUNG SP2504C VT100-50> at ata0-master SATA300 > ad1: 157066MB <Hitachi HDS722516VLAT80 V34OA63A> at ata4-master UDMA100 > > i've tried to test the drives' performances using the following commands: > > dd if=/dev/ad0 of=/dev/null bs=1m count=300 > and > dd if=/dev/ad1 of=/dev/null bs=1m count=300 > > the results are: > ad0 = 314572800 bytes transferred in 4.325645 secs (72722751 bytes/sec) > ad1 = 314572800 bytes transferred in 5.166126 secs (60891430 bytes/sec) > > the results for ad0 are a bit disappointing though. is this normal or is bs=1m > 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. [-- Attachment #2 --] -----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-----
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