From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roberto Spadim Subject: Re: What's the typical RAID10 setup? Date: Fri, 4 Feb 2011 19:13:45 -0200 Message-ID: References: <20110131152151.GD7861@cthulhu.home.robinhill.me.uk> <4D470F96.40409@cfl.rr.com> <4D471A41.1090706@hardwarefreak.com> <4D4730C0.8080900@cfl.rr.com> <20110201092007.GA7860@cthulhu.home.robinhill.me.uk> <4D4C2352.9000407@cfl.rr.com> <20110204162212.GA21779@cthulhu.home.robinhill.me.uk> <4D4C6A25.5070604@hardwarefreak.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <4D4C6A25.5070604@hardwarefreak.com> Sender: linux-raid-owner@vger.kernel.org To: Stan Hoeppner Cc: Phillip Susi , Linux-RAID List-Id: linux-raid.ids http://www.lsi.com/DistributionSystem/AssetDocument/SCG_LSI_SAS_6Gbps_I= R_PB_092909.pdf raid10 =3D (can use linux raid10 too, but i=B4m just explaning raid 1+0= ) mdadm --create /dev/md0 --level=3D1 --raid-devices 2 /dev/sda /dev/sdb mdadm --create /dev/md1 --level=3D1 --raid-devices 2 /dev/sdc /dev/sdd mdadm --create /dev/md2 --level=3D0 --raid-devices 2 /dev/md0 /dev/md1 2011/2/4 Stan Hoeppner : > Robin Hill put forth on 2/4/2011 10:22 AM: >> On Fri Feb 04, 2011 at 11:03:30AM -0500, Phillip Susi wrote: >> >>> FYI, you should get in the habit of using your mail client's reply = to >>> all function. =A0I did not see this until now because you did not s= end me >>> a copy. >>> >> I'll make an exception in this case, but I generally reply to messag= es >> on mailing lists to the list only, and I have no plans to change thi= s. >> >>> On 2/1/2011 4:20 AM, Robin Hill wrote: >>>> No, it's RAID 10 or RAID 1+0. RAID 0+1 would be 2 mirrored pairs o= f >>>> 5-disk RAID 0 arrays, in which case you could only lose 5 disks if >>> >>> In English we read from left to right and top to bottom, so 0+1 mea= ns >>> stripe on top of mirror. >>> >> The vast majority of online sources would disagree with you. =A0See: >> =A0 =A0 http://en.wikipedia.org/wiki/Nested_RAID_levels >> =A0 =A0 http://www.aput.net/~jheiss/raid10/ >> =A0 =A0 http://decipherinfosys.wordpress.com/2008/01/15/difference-b= etween-raid-01-vs-raid-10/ >> =A0 =A0 http://www.raid.com/04_01_0_1.html >> =A0 =A0 http://www.pcguide.com/ref/hdd/perf/raid/levels/multLevel01-= c.html >> =A0 =A0 http://www.adrc.com/raid-01.html >> >> The order it's written is the order of creation. =A0RAID0+1 =3D =A0R= AID 0, >> then RAID 1 (mirrored stripes) and RAID1+0 =3D RAID 1, then RAID 0 >> (striped mirrors). > > LSI is the undisputed king of HBA RAID, with all major server OEMs re= badging LSI > cards and/or using their storage processor chips on the mobo, includi= ng Dell, > HP, IBM, Intel, Sun, etc. =A0Note the diagram at the bottom of this P= DF showing > the layout of RAID 10: > > http://www.lsi.com/DistributionSystem/AssetDocument/SCG_LSI_SAS_6Gbps= _IR_PB_092909.pdf > > It clearly shows a stripe over two mirrors. > > -- > Stan > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at =A0http://vger.kernel.org/majordomo-info.html > --=20 Roberto Spadim Spadim Technology / SPAEmpresarial -- 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