From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Matthews Subject: Re: Adding disks with raid to existing raid system. Date: Mon, 15 Mar 2010 22:31:10 -0700 Message-ID: <40b437201003152231j78494657la373a2ab67156cbe@mail.gmail.com> References: <40b437201003142323g7b0f4e48wb9d58b963f12e988@mail.gmail.com> <4877c76c1003151836r56d03faeh50d8bfd1bb2925cf@mail.gmail.com> <40b437201003152053i69fd7a69kfa25f2900a01bb6f@mail.gmail.com> <4877c76c1003152159o315f0a64mcbf0203170010c26@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <4877c76c1003152159o315f0a64mcbf0203170010c26@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: Michael Evans Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Mon, Mar 15, 2010 at 9:59 PM, Michael Evans = wrote: > On Mon, Mar 15, 2010 at 7:53 PM, Simon Matthews > wrote: >> On Mon, Mar 15, 2010 at 5:36 PM, Michael Evans wrote: >>> On Sun, Mar 14, 2010 at 10:23 PM, Simon Matthews >>> wrote: >>>> I have just built a system and have it booting off a software raid >>>> partition. The raid sets use devices /dev/md0, /dev/hd1, /dev/md2, >>>> /dev/md3. >>>> >>>> I now need to transfer some additional disks to this system. These >>>> disks are presently in another system where they host a number of = raid >>>> sets, currently also /dev/md0 - /dev/md4. >>>> >>>> I need to ensure that the data on the raid set that I am adding to= the >>>> system is not lost. However, clearly, I can't have the raid sets o= n >>>> these disks come up as /dev/md0-md4. How do I ensure this and have >>>> these raid sets come up on /dev/md5 and higher? >>>> >>>> Simon >>>> -- >>>> To unsubscribe from this list: send the line "unsubscribe linux-ra= id" in >>>> the body of a message to majordomo@vger.kernel.org >>>> More majordomo info at =A0http://vger.kernel.org/majordomo-info.ht= ml >>>> >>> >>> Either use an mdadm.conf to specify the mapping of UUID to md devic= e >>> (which will over-ride any auto-detected requests), or use the >>> home-host fallback. =A0Obviously the administrator specifying how t= hey'd >>> prefer mdadm to assemble the drives is preferable. >> >> I'm not aware of the "home-host fallback" can you give me some point= ers on this? >>> >>> You will probably want to regenerate your initrd; if you are using >>> auto-assembly on root without an initrd, I highly suggest upgrading= to >>> use an initrd/initramfs. =A0You might find this one easy to customi= ze >>> for your needs if your distribution lacks one or you dislike the on= e >>> it generates: http://sourceforge.net/projects/aeuio/ >> >> Fortunately Gentoo includes mkinitrd so I can try this if other >> methods don't work reliably. >> >> Simon >> >>> >> > > man mdadm > /host > > --homehost=3D > > This will override any HOMEHOST setting in the config file and > provides the identity of the host which should be considered the home > for any arrays. > > ... etc > > Before asking any further questions I highly suggest reading the > manual, completely, at least twice. > In my defense, I did try to google this, but I looked for "home-host" or "home host" and nothing turned up. Many thanks for your help. I think this will solve my question about added existing arrays to a system. Simon -- 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