Date: Wed, 28 Mar 2007 06:21:34 -0700 (PDT) From: "R. B. Riddick" <arne_woerner@yahoo.com> To: "Szabó" "Péter" <matyee@mail.alba.hu>, freebsd-geom@freebsd.org Subject: Re: raid3 is slow Message-ID: <657228.54534.qm@web30313.mail.mud.yahoo.com> In-Reply-To: <008701c77139$613694b0$6502a8c0@peteruj>
next in thread | previous in thread | raw e-mail | index | archive | help
--- Szabó Péter <matyee@mail.alba.hu> wrote: > raid3 > Transfer rates: > outside: 102400 kbytes in 1.179933 sec = 86785 kbytes/sec > middle: 102400 kbytes in 1.148816 sec = 89135 kbytes/sec > inside: 102400 kbytes in 1.171987 sec = 87373 kbytes/sec > Looks good... > #diskinfo -vt /dev/label/nmivol1 > outside: 102400 kbytes in 1.839020 sec = 55682 kbytes/sec > middle: 102400 kbytes in 2.112483 sec = 48474 kbytes/sec > inside: 102400 kbytes in 3.416896 sec = 29969 kbytes/sec > Looks slow... > # atacontrol mode ad0 > current mode = UDMA100 > # atacontrol mode ad1 > current mode = UDMA100 > # atacontrol mode ad2 > current mode = UDMA100 > # atacontrol mode ad3 > current mode = UDMA100 > # atacontrol mode ad6 > current mode = SATA150 > Looks good... > gstripe may help, and extends disk space, but less secure. > Yup... > #dd if=/dev/zero of=/mnt/new/x.x bs=1m count=128 > 128+0 records in > 128+0 records out > 134217728 bytes transferred in 11.410957 secs (11762180 bytes/sec) > Hmm And what if u try this: dd if=/dev/raid3/... of=/dev/null bs=1m count=128 ? > > Disks ad0 ad1 ad2 ad3 ad6 intrn > > KB/t 8.42 8.42 8.42 8.42 5.67 113904 buf > > tps 287 287 287 287 1780 133 dirtybuf > > MB/s 2.36 2.36 2.36 2.36 9.85 69984 desiredvnodes > > % busy 25 26 24 26 99 21586 numvnodes > 8KB/transfer is a little low for my taste... Looks like ur copy program uses 32KB transfers, instead of 128KB transfers... > > I use mc to copy. > What if u try dd if=/source-file/on/raid3-device of=/dev/null bs=1m count=128 ? -Arne ____________________________________________________________________________________ Don't pick lemons. See all the new 2007 cars at Yahoo! Autos. http://autos.yahoo.com/new_cars.html
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?657228.54534.qm>