From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: raid1 and raid 10 always writes all data to all disks? Date: Mon, 04 Feb 2008 13:24:10 -0500 Message-ID: <47A7584A.5080503@tmr.com> References: <20080202235335.GA29029@rap.rap.dk> <47A5E411.10208@tmr.com> <20080203171317.GA24820@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: <20080203171317.GA24820@rap.rap.dk> Sender: linux-raid-owner@vger.kernel.org To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Keld J=F8rn Simonsen wrote: > On Sun, Feb 03, 2008 at 10:56:01AM -0500, Bill Davidsen wrote: > =20 >> Keld J=F8rn Simonsen wrote: >> =20 >>> I found a sentence in the HOWTO: >>> >>> "raid1 and raid 10 always writes all data to all disks" >>> >>> I think this is wrong for raid10. >>> >>> eg >>> >>> a raid10,f2 of 4 disks only writes to two of the disks - >>> not all 4 disks. Is that true? >>> =20 >>> =20 >> I suspect that really should have read "all mirror copies," in the=20 >> raid10 case. >> =20 > > OK, I changed the text to: > > raid1 always writes all data to all disks. > =20 Just to be really pedantic, you might say "devices" instead of disks,=20 since many or most arrays are on partitions. Otherwise I like this, it'= s=20 much clearer. > raid10 always writes all data to the number of copies that the raid h= olds. > For example on a raid10,f2 or raid10,o2 of 6 disks, the data will onl= y > be written 2 times. > > Best regards > Keld > > =20 --=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