From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: striping of a 4 drive raid10 Date: Mon, 28 Jan 2008 13:24:45 -0500 Message-ID: <479E1DED.4010907@tmr.com> References: <20080127193345.GA5426@rap.rap.dk> <18332.58858.191866.347099@notabene.brown> <20080127204841.GA10112@rap.rap.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20080127204841.GA10112@rap.rap.dk> Sender: linux-raid-owner@vger.kernel.org To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= Cc: Neil Brown , linux-raid@vger.kernel.org List-Id: linux-raid.ids Keld J=F8rn Simonsen wrote: > On Mon, Jan 28, 2008 at 07:13:30AM +1100, Neil Brown wrote: > =20 >> On Sunday January 27, keld@dkuug.dk wrote: >> =20 >>> Hi >>> >>> I have tried to make a striping raid out of my new 4 x 1 TB >>> SATA-2 disks. I tried raid10,f2 in several ways: >>> >>> 1: md0 =3D raid10,f2 of sda1+sdb1, md1=3D raid10,f2 of sdc1+sdd1, m= d2 =3D raid0 >>> of md0+md1 >>> >>> 2: md0 =3D raid0 of sda1+sdb1, md1=3D raid0 of sdc1+sdd1, md2 =3D r= aid01,f2 >>> of md0+md1 >>> >>> 3: md0 =3D raid10,f2 of sda1+sdb1, md1=3D raid10,f2 of sdc1+sdd1, c= hunksize of=20 >>> md0 =3Dmd1 =3D128 KB, md2 =3D raid0 of md0+md1 chunksize =3D 256 K= B >>> >>> 4: md0 =3D raid0 of sda1+sdb1, md1=3D raid0 of sdc1+sdd1, chunksize >>> of md0 =3D md1 =3D 128 KB, md2 =3D raid01,f2 of md0+md1 chunksize =3D= 256 KB >>> >>> 5: md0=3D raid10,f4 of sda1+sdb1+sdc1+sdd1 >>> =20 >> Try >> 6: md0 =3D raid10,f2 of sda1+sdb1+sdc1+sdd1 >> =20 > > That I already tried, (and I wrongly stated that I used f4 in stead o= f > f2). I had two times a thruput of about 300 MB/s but since then I cou= ld > not reproduce the behaviour. Are there errors on this that has been > corrected in newer kernels? > > > =20 >> Also try raid10,o2 with a largeish chunksize (256KB is probably big >> enough). >> =20 > > I tried that too, but my mdadm did not allow me to use the o flag. > > My kernel is 2.6.12 and mdadm is v1.12.0 - 14 June 2005. > can I upgrade the mdadm alone to a newer version, and then which is > recommendable? > =20 I doubt that updating the mdadm is going to help, the kernel is old and= =20 lacks a number of improvements in the last few years. I don't think you= =20 will see any major improvements without a kernel upgrade. --=20 Bill Davidsen "Woe unto the statesman who makes war without a reason that will stil= l be valid when the war is over..." Otto von Bismark=20 - To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html