From mboxrd@z Thu Jan 1 00:00:00 1970 From: SandeepKsinha Subject: Re: Requesting replace mode for changing a disk Date: Wed, 13 May 2009 10:07:00 +0530 Message-ID: <37d33d830905122137l18f13c2aoec8e1cf67fdba2c0@mail.gmail.com> References: <4A060CBE.9090308@tmr.com> <20090513012112681.IEFQ19662@cdptpa-omta02.mail.rr.com> <18954.19719.172893.761454@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <18954.19719.172893.761454@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: lrhorer@satx.rr.com, Linux RAID List-Id: linux-raid.ids Hi, On Wed, May 13, 2009 at 10:01 AM, Neil Brown wrote: > On Tuesday May 12, lrhorer@satx.rr.com wrote: >> >> But doesn't creating the array with the drive wipe the contents? =A0= If so, it >> doesn't seem to me this provides much redundancy. > > No. =A0Creating an array does not wipe the contents. > It might cause a resync which will copy contents from one drive to th= e > other and I don't promise which one. > However if you: > Now, my question is that what if I create a RAID1 with 100 disks on eac= h side. Do you mean to say that there will be unnecessary resync happening there as well, that too for unallocated/written data. If thats the case, we surely need to handle these two situations differently (1) which neil mentioned (2) the one I mentioned above. Remember I referring to the case of creation. > =A0 mdadm -C /dev/md0 --level 1 -n 2 /dev/foo missing > =A0 mdadm /dev/md0 --add /dev/bar > > then the contents on /dev/foo will not be changed (except for a few K > at the end for the metadata) and then all of foo will be copied to > bar. > Will the create happen at the first place? > NeilBrown > -- > 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 Regards, Sandeep. =09 =93To learn is to change. Education is a process that changes the learn= er.=94 -- 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