Date: Sat, 21 Jan 2006 19:15:20 -0500 From: "Tamouh H." <hakmi@rogers.com> To: <freebsd-questions@freebsd.org> Subject: RE: slow RAID-5 on FreeBSD 5.4 Message-ID: <20060122001523.4E29243D5F@mx1.FreeBSD.org> In-Reply-To: <20060122000609.3DDFE43D48@mx1.FreeBSD.org>
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On another note, I've ran diskinfo test and these are the results, much =
better but still the RAID-5 slower than a single drive:
impala# diskinfo -t aacd1
aacd1
512 # sectorsize
146781044736 # mediasize in bytes (137G)
286681728 # mediasize in sectors
17845 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 3.291258 sec =3D 13.165 msec
Half stroke: 250 iter in 2.362839 sec =3D 9.451 msec
Quarter stroke: 500 iter in 3.908358 sec =3D 7.817 msec
Short forward: 400 iter in 2.478195 sec =3D 6.195 msec
Short backward: 400 iter in 2.459182 sec =3D 6.148 msec
Seq outer: 2048 iter in 0.661217 sec =3D 0.323 msec
Seq inner: 2048 iter in 0.637923 sec =3D 0.311 msec
Transfer rates:
outside: 102400 kbytes in 1.659174 sec =3D 61717 =
kbytes/sec
middle: 102400 kbytes in 1.763043 sec =3D 58081 =
kbytes/sec
inside: 102400 kbytes in 2.867523 sec =3D 35710 =
kbytes/sec
impala# diskinfo -t aacd0
aacd0
512 # sectorsize
293561434112 # mediasize in bytes (273G)
573362176 # mediasize in sectors
35690 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 2.966840 sec =3D 11.867 msec
Half stroke: 250 iter in 2.270758 sec =3D 9.083 msec
Quarter stroke: 500 iter in 4.493850 sec =3D 8.988 msec
Short forward: 400 iter in 2.681128 sec =3D 6.703 msec
Short backward: 400 iter in 1.520458 sec =3D 3.801 msec
Seq outer: 2048 iter in 0.631963 sec =3D 0.309 msec
Seq inner: 2048 iter in 0.625584 sec =3D 0.305 msec
Transfer rates:
outside: 102400 kbytes in 2.139737 sec =3D 47856 =
kbytes/sec
middle: 102400 kbytes in 3.080063 sec =3D 33246 =
kbytes/sec
inside: 102400 kbytes in 4.358889 sec =3D 23492 =
kbytes/sec
=20
>=20
> Hello,
>=20
> I've just ran Bonnie on a FreeBSD 5.4 machine with Adaptec=20
> 2230SLP RAID-5 SCSI Card and Seagate 146GB 10K RPM U320 drives.=20
>=20
> The results were very surprising. The RAID-5 is EXTREMELY=20
> slow, and I can't figure out why!=20
>=20
> The RAID controller has two volumes: RAID-5 and a lone drive.
>=20
> This is Bonnie results from the lone drive on the Adaptec card:
>=20
> impala# ./Bonnie -d /tmp
> File '/tmp/Bonnie.30883', size: 104857600 Writing with=20
> putc()...done Rewriting...done Writing intelligently...done=20
> Reading with getc()...done Reading intelligently...done=20
> Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
> -------Sequential Output-------- ---Sequential=20
> Input-- --Random--
> -Per Char- --Block--- -Rewrite-- -Per Char-=20
> --Block--- --Seeks---
> Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU=20
> K/sec %CPU /sec %CPU
> 100 27168 28.2 31668 13.9 36530 10.8 83540 92.1=20
> 495217 98.5 26086.8 182.8
>=20
> Here are the results doing the same test on the RAID-5:
>=20
> impala# ./Bonnie -d /usr
> File '/usr/Bonnie.30972', size: 104857600 Writing with=20
> putc()...done Rewriting...done Writing intelligently...done=20
> Reading with getc()...done Reading intelligently...done=20
> Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
> -------Sequential Output-------- ---Sequential=20
> Input-- --Random--
> -Per Char- --Block--- -Rewrite-- -Per Char-=20
> --Block--- --Seeks---
> Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU=20
> K/sec %CPU /sec %CPU
> 100 7478 7.7 10727 4.3 7250 3.2 101910 99.6=20
> 1464070 99.2 24067.2 180.6
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