Date: Thu, 26 Feb 2009 07:28:12 +0100 (CET) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Josh Paetzel <josh@tcbug.org> Cc: questions@freebsd.org Subject: Re: SAS drives seem slow Message-ID: <alpine.BSF.2.00.0902260728040.12252@wojtek.tensor.gdynia.pl> In-Reply-To: <F1AB5657-660C-4554-BCF5-9E5C8001C74D@tcbug.org> References: <F1AB5657-660C-4554-BCF5-9E5C8001C74D@tcbug.org>
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> FreeBSD services.tcbug.org 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Feb 16 > 21:07:14 UTC 2009 root@:/usr/obj/usr/src/sys/SERVICES amd64 > > But 6.x and 7.x give similar results. > > The disks themselves are capable of sequential read/write in the 180 Meg/sec > range, so I'm trying to understand why I'm being told they are 100 Meg/sec, > and why that seems to be their real world performance cap. > probably you use RAID5 > # dd if=/dev/zero of=stuff bs=8m count=100 > 100+0 records in > 100+0 records out > 838860800 bytes transferred in 8.711125 secs (96297644 bytes/sec) > > Thanks, > > Josh Paetzel > > > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >
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