From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx06.extmail.prod.ext.phx2.redhat.com [10.5.110.10]) by int-mx05.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id n8A6ZSLF002129 for ; Thu, 10 Sep 2009 02:35:28 -0400 Received: from maude.comedia.it (mail.comedia.it [77.93.254.181]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n8A6ZCCH029448 for ; Thu, 10 Sep 2009 02:35:13 -0400 Received: from localhost (localhost [127.0.0.1]) by maude.comedia.it (Postfix) with ESMTP id 5FF6C86F12 for ; Thu, 10 Sep 2009 08:35:11 +0200 (CEST) Received: from maude.comedia.it ([127.0.0.1]) by localhost (maude.comedia.it [127.0.0.1]) (amavisd-new, port 10025) with LMTP id pRglBSLRustq for ; Thu, 10 Sep 2009 08:35:11 +0200 (CEST) Date: Thu, 10 Sep 2009 08:35:11 +0200 From: Luca Berra Subject: Re: [linux-lvm] Understanding if a disk is partioned with LVM or not Message-ID: <20090910063511.GA7247@maude.comedia.it> References: <352f9c2a0909092319h2e115e07lbf867825c68c102e@mail.gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <352f9c2a0909092319h2e115e07lbf867825c68c102e@mail.gmail.com> Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" Content-Transfer-Encoding: 7bit To: linux-lvm@redhat.com On Thu, Sep 10, 2009 at 09:19:29AM +0300, pent 5971 wrote: >Hi, >Im new to this LVM stuff and still couldnt read and understand enough. >But i have a RHEL 5x box (which i didnt installed) and we have rhel uses lvm by default >phsically added a new disk which i have to create a file system to be >able to use it. df -h command gives normal /var /data / partions, but first column of df output is the device, if it looks like /dev/sd?? or /dev/hd?? it is a normal partition if it looks like /dev/mapper/xxxxx-yyyy or /dev/xxxxx/yyyy it is probably an lvm also the commands vgs, lvs, and pvs help, i.e. root@Moskowskaya # vgs VG #PV #LV #SN Attr VSize VFree vg00 1 7 0 wz--n 232.81G 10.81G root@Moskowskaya # pvs PV VG Fmt Attr PSize PFree /dev/sda vg00 lvm2 a- 232.81G 10.81G >id like ask how can i understand if the first disk/sytem is created >with LVM , and if so (any other box can be so in the future) what is >best way to add the disk and crete the file system? woah, well, the simple answer is: there is no best way, you have to evaluate the pros and cons yourself. you could add the new disk to the existing volume group, which would give you the advantage of using avaliable space as a single pool and being able to create/extend existing logical volumes/filesystems using both disks. with the disadvantage of being more painful to recover in case one of the disks fails. you could create a new volume group using the new disk, or create a partition if you are more confortable, or even use the whole device for the new filesystem. L. -- Luca Berra -- bluca@comedia.it Communication Media & Services S.r.l. /"\ \ / ASCII RIBBON CAMPAIGN X AGAINST HTML MAIL / \