Date: Thu, 8 Dec 2011 10:19:43 +0100 From: Matthias Apitz <guru@unixarea.de> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-questions@freebsd.org, freebsd-usb@freebsd.org Subject: Re: restore(8) to UFS on USB key: terrible slow Message-ID: <20111208091943.GA7014@tinyCurrent> In-Reply-To: <201112081010.36695.hselasky@c2i.net> References: <20111208063711.GA6482@tinyCurrent> <201112081010.36695.hselasky@c2i.net>
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El día Thursday, December 08, 2011 a las 10:10:36AM +0100, Hans Petter Selasky escribió: > > # fdisk -I da0 > > # fdisk -B da0 > > # bsdlabel -w da0s1 auto > > # bsdlabel -B da0s1 > > # bsdlabel -e da0s1 > > # newfs /dev/da0s1a > > # mount /dev/da0s1a /mnt > > > > When I now bulk write a big file to the file system, the write > > performance is reasonable fast, even with blocks of 512 bytes, > > it gives 2 MByte / sec: > > > > # dd if=usb.dmp of=/mnt/byte > > 10926520+0 records in > > 10926520+0 records out > > 5594378240 bytes transferred in 2538.942585 secs (2203428 bytes/sec) > > > > Hello! > > The default block size of dd is 512 bytes. Try setting bs=65536 :-) Hello Hans, I know (as I said) that dd(1) per default writes in blocks of 512 bytes; but this is not the problem; the problem is the poor performance of restore(8); the dd(1) was just to see if the USB key performs fast enough in general; please read my post again :-) Thanks matthias -- Matthias Apitz t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211 e <guru@unixarea.de> - w http://www.unixarea.de/ UNIX since V7 on PDP-11 | UNIX on mainframe since ESER 1055 (IBM /370) UNIX on x86 since SVR4.2 UnixWare 2.1.2 | FreeBSD since 2.2.5
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