From mboxrd@z Thu Jan 1 00:00:00 1970 From: "shahid shaikh" Subject: RE: LVM Multipathing Date: Sun, 13 Feb 2005 16:59:17 +0530 Message-ID: <000101c511bf$41a22be0$11051aac@pcp41116> References: <420F2BD0.4020707@free.fr> Reply-To: shahid.shaikh@patni.com, device-mapper development Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----------=_1108293840-8348-230" In-Reply-To: <420F2BD0.4020707@free.fr> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: 'Christophe Varoqui' Cc: "Dm-Devel (E-mail)" List-Id: dm-devel.ids This is a multi-part message in MIME format... ------------=_1108293840-8348-230 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Hello, I seen FAQ. Part relevant to me from FAQ (copied below) consist semething related to files /etc/mkinitrd/modules and /etc/mkinitrd/scripts. But these files are not peresnt at the given location on my system. I have installed udev-021-36.32 and multipath-tools-0.2.1 ( one which come bundled with SLES9). Please let me know why they are not present over. is there something still missing? Or i need install something else ( obviously excluding OS)? 1. How to set up System-on-multipath ? ====================================== prerequisite : udev and multipath-tools installed here are the steps on a Debian SID system : * add dm-mpath and dm-multipath to /etc/mkinitrd/modules * copy $tools_dir/multipath/0[12]_* to /etc/mkinitrd/scripts * define a friendly alias for your multipathed root disk (in /etc/multipath.conf). Example : "system" * enable busybox in /etc/mkinitrd/mkinitrd.conf and set ROOT to any valid block-device (but not a /dev/dm-* one, due to an mkintrd misbelief that all dm-* are managed by LVM2) * run mkinitrd * in /boot/grub/menu.lst, define the root= kernel parameter Example : root=/dev/system1 * modify /etc/fstab to reference /dev/system* partitions At reboot, you should see some info like : path /dev/sda : multipath system ... gpt: 0 slices dos: 5 slices reduced size of partition #2 to 63 Added system1 : 0 70685937 linear /dev/system 63 Added system2 : 0 63 linear /dev/system 7068600 Added system5 : 0 995967 linear /dev/system 70686063 ... Thanks and Regards, Shahid Shaikh. -----Original Message----- From: Christophe Varoqui [mailto:christophe.varoqui@free.fr] Sent: Sunday, February 13, 2005 3:59 PM To: shahid.shaikh@patni.com; device-mapper development Subject: Re: [dm-devel] LVM Multipathing Hello, This is documented in the multipath-tools' FAQ. In lvm2.conf, you need to exclude the paths from the scaning, and allow DM devices to be scaned. regards, cvaroqui shahid shaikh wrote: >Hi, > >I am trying to test multipathing on lvm2. > >Configuration that i am using is as below: > >OS : SLES9 ( kernel 2.6.5) >lvm : lvm2-2.00.15-0.3 >multipath-tools : multipath-tools-0.2.1 >udev : udev-021-36.32 >sysfs : sblim-cmpi-sysfs-1.1.5-0.2 >hotplug : hotplug-0.44-32.21 and hotplugctl-0.08-264.1 >device-mapper : device-mapper-1.00.09-17.5 > >I tried following things : > >When I dont have multipaths for LUNs: >1) I tried to create PVs on LUNs using pvcreate >2) Then VGs using above PVs by command vgcreate >3) Then I have created some LVs on VGs. >4) I also fire some I/O on these LVs. >All aboe commands worked succesfully reflecting changes in pvscan, vgscan >and lvscan. > >When I have multiplepaths to LUNs: >I tried to create PV on one of the device but on doing pvscan it shows me >some other device. > e.g My LUN no 5 has for paths so I can see these four paths as >/dev/sdb, /dev/sdg, /dev/sdl and /dev/sdq. > then i did following > linux# pvcreate /dev/sdb > /dev/sdb successfully created > linux# pvscan > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdb not >/dev/sdq > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdg not >/dev/sdq > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdl not >/dev/sdq > PV /dev/sdq VG vg01 lvm2 [1.00 GB / 972.00 MB free] > Total: 1 [1.00 GB] / in use: 1 [1.00 GB] / in no VG: 0 [0 ] > > linux# vgcreate vg01 > succesfully created > > linux# vgscan > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdb not >/dev/sdq > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdg not >/dev/sdq > Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdl not >/dev/sdq > > I tried the same thing with all permutations but i couldnt create a volume >group. > > I also have multipath-tools-0.3.9 and multipath-tools-0.4.2. > But I am not sure whether they will compatible with kernel 2.6.5. > >If you can help me in this scenario I will be thankfull to you. >Please let me know the steps through which I can achieve multipathing on my >configuration. > >Thanks and Regards, >Shahid Shaikh. > > > >http://www.patni.com >World-Wide Partnerships. 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