Date: Sun, 2 Oct 2005 16:15:58 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: <freebsd-performance@freebsd.org>, "Patrick Proniewski" <patpro@patpro.net> Subject: Re: dd(1) performance when copiing a disk to another Message-ID: <003e01c5c764$3391d720$b3db87d4@multiplay.co.uk> References: <7035DA0C-E43C-478B-9B1C-6A32545E5E63@patpro.net>
next in thread | previous in thread | raw e-mail | index | archive | help
That's actually pretty good for a sustained read / write on a single disk.
Steve
----- Original Message -----
From: "Patrick Proniewski" <patpro@patpro.net>
To: <freebsd-performance@freebsd.org>
Sent: Sunday, October 02, 2005 3:57 PM
Subject: dd(1) performance when copiing a disk to another
Hi,
(carte mère supermicro
chip SATA Intel 6300ESB)
I run FreeBSD 5.4 on a PIV 3GHz (SuperMicro motherboard, Intel SATA
6300ESB chipset) with 2 SATA HDD. I'm in the process to duplicate the
boot HDD to the second HDD. I run dd for that:
# dd if=/dev/ad4 of=/dev/ad6 bs=1m
It yields to poor performances:
$ iostat -dhKw 1
(...)
ad4 ad6
KB/t tps MB/s KB/t tps MB/s
124.49 252 30.69 128.00 246 30.69
128.00 285 35.64 128.00 279 34.90
128.00 282 35.27 128.00 283 35.40
(...)
Is it normal that data rate won't go upper than 35/38 MB/s ?
HDDs are: ad4 -> Maxtor 80 Go 7200 rpm
ad6 -> Hitachi 80 Go 7200 rpm
one more question: is dd(1) a good way to duplicate a boot drive to
make a bootable spare disk ?
patpro_______________________________________________
freebsd-performance@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-performance
To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org"
================================================
This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it.
In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137
or return the E.mail to postmaster@multiplay.co.uk.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?003e01c5c764$3391d720$b3db87d4>